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Document and Entity Information - USD ($)	6 Months Ended
Document and Entity Information - USD ($)	Jun. 30, 2010	Jul. 29, 2010	Jun. 30, 2009
Document and Entity Information [Abstract]
Entity Registrant Name	WESCO INTERNATIONAL INC
Entity Central Index Key	0000929008
Document Type	10-Q
Document Period End Date	Jun. 30, 2010
Amendment Flag	false
Document Fiscal Year Focus	2010
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,023,200,000
Entity Common Stock, Shares Outstanding		42,453,342

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2009
Current Assets:
Cash and cash equivalents	$ 95,804	$ 112,329
Trade accounts receivable, net of allowance for doubtful accounts of $20,241 and $20,060 in 2010 and 2009, respectively	731,320	635,754
Other accounts receivable	16,348	31,808
Inventories, net	531,486	507,215
Current deferred income taxes	1,622	1,686
Income taxes receivable	22,174	29,135
Prepaid expenses and other current assets	16,998	13,077
Total current assets	1,415,752	1,331,004
Property, buildings and equipment, net	114,355	116,309
Intangible assets, net	77,625	81,308
Goodwill	876,873	863,410
Investment in subsidiary	0	43,957
Deferred income taxes	35,707	33,518
Other assets	12,292	24,687
Total assets	2,532,604	2,494,193
Current Liabilities:
Accounts payable	540,706	453,154
Accrued payroll and benefit costs	38,444	30,949
Current portion of long-term debt	95,975	93,977
Bank overdrafts	22,530	32,191
Current deferred income taxes	7,715	7,301
Other current liabilities	72,943	63,262
Total current liabilities	778,313	680,834
Long-term debt, net of discount of $180,131 and $182,689 in 2010 and 2009, respectively	483,812	597,869
Deferred income taxes	190,486	191,068
Other noncurrent liabilities	28,639	28,133
Total liabilities	$ 1,481,250	$ 1,497,904
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Common stock	560	560
Additional capital	1,001,211	992,855
Retained earnings	629,193	582,199
Treasury stock, at cost; 17,893,526 and 17,890,459 shares in 2010 and 2009, respectively	(590,464)	(590,353)
Accumulated other comprehensive income	10,811	10,985
Total stockholders' equity	1,051,354	996,289
Total liabilities and stockholders' equity	2,532,604	2,494,193
Class B nonvoting convertible common stock
Stockholders' Equity:
Common stock	$ 43	$ 43

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Jun. 30, 2010	Dec. 31, 2009
Current Assets:
Allowance for doubtful accounts	$ 20,241,000	$ 20,060,000
Liabilities and Stockholders' Equity
Long-term debt, discount	180,131,000	182,689,000
Stockholders' Equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	210,000,000	210,000,000
Common stock, shares issued	56,040,538	55,967,824
Common stock, shares outstanding	42,486,443	42,416,796
Treasury stock, shares	17,893,526	17,890,459
Class B nonvoting convertible common stock
Stockholders' Equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	4,339,431	4,339,431
Common stock, shares outstanding	0	0

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2010	Jun. 30, 2009	Jun. 30, 2010	Jun. 30, 2009
Condensed Consolidated Statements of Income (Unaudited) [Abstract]
Net sales	$ 1,259,121	$ 1,159,218	$ 2,407,720	$ 2,338,807
Cost of goods sold (excluding depreciation and amortization below)	1,016,169	935,306	1,937,352	1,876,763
Selling, general and administrative expenses	185,977	169,914	369,016	357,347
Depreciation and amortization	5,620	6,360	11,721	13,516
Income from operations	51,355	47,638	89,631	91,181
Interest expense, net	14,400	13,821	27,930	26,350
Other income	(1,778)	(1,101)	(4,284)	(2,727)
Income before income taxes	38,733	34,918	65,985	67,558
Provision for income taxes	10,940	8,464	18,992	17,842
Net income	$ 27,793	$ 26,454	$ 46,993	$ 49,716
Earnings per share:
Basic	$ 0.65	$ 0.63	$ 1.11	$ 1.18
Diluted	$ 0.6	$ 0.62	$ 1.04	$ 1.17

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2010	Jun. 30, 2009
Operating Activities:
Net income	$ 46,993	$ 49,716
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,721	13,516
Amortization of debt issuance costs	1,303	2,029
Amortization of debt discount	2,558	7,691
Deferred income taxes	(3,789)	5,433
Stock-based compensation expense	7,117	6,319
Loss (gain) on sale of property, buildings and equipment	62	(362)
Asset impairment charge	3,793
Equity income, net of distributions in 2010 and 2009 of $1,864 and $3,395, respectively	(2,421)	668
Excess tax benefit from stock-based compensation	(629)	(155)
Interest related to uncertain tax positions	(310)	597
Changes in assets and liabilities
Trade and other receivables, net	(80,204)	132,937
Inventories, net	(21,844)	92,011
Prepaid expenses and other current assets	3,217	(5,580)
Accounts payable	85,756	(72,623)
Accrued payroll and benefit costs	7,491	(23,831)
Other current and noncurrent liabilities	7,942	(3,664)
Net cash provided by operating activities	68,756	204,702
Investing Activities:
Capital expenditures	(6,022)	(6,224)
Acquisition payments	(14,296)	(122)
Proceeds from sale of subsidiary	40,000
Equity distribution	4,054	1,039
Collection of note receivable	15,000
Proceeds from sale of assets	178	98
Net cash provided (used) by investing activities	38,914	(5,209)
Financing Activities:
Proceeds from issuance of long-term debt	310,452	248,200
Repayments of long-term debt	(424,404)	(422,066)
Debt issuance costs	(596)	(1,890)
Proceeds from the exercise of stock options	613	312
Excess tax benefit from stock-based compensation	629	155
Repurchase of common stock	(111)	(18)
Decrease in bank overdrafts	(9,660)	(9,188)
Payments on capital lease obligations	(830)	(1,027)
Net cash used by financing activities	(123,907)	(185,522)
Effect of exchange rate changes on cash and cash equivalents	(288)	2,981
Net change in cash and cash equivalents	(16,525)	16,952
Cash and cash equivalents at the beginning of period	112,329	86,338
Cash and cash equivalents at the end of period	95,804	103,290
Non-cash investing and financing activities:
Property, buildings and equipment acquired through capital leases	$ 164	$ 728

Stock Based Compensation

6 Months Ended

Jun. 30, 2010

Stock-Based Compensation [Abstract]

STOCK-BASED COMPENSATION

3. STOCK-BASED COMPENSATION

WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights and restricted stock units. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. The fair value of restricted stock units is determined by the grant-date closing price of WESCO’s common stock. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. No dividends are assumed.

During the three and six month periods ended June 30, 2010 and 2009, WESCO granted the following stock-settled stock appreciation rights at the following weighted average assumptions:


	Three Months Ended June 30,						Six Months Ended June 30,
	2010			2009			2010			2009

Stock-settled appreciations rights granted		13,250			1,700			24,000			1,700
Risk free interest rate		2.2	%		2.0	%		2.2	%		2.0	%
Expected life		5.0 years			4.5 years			4.8 years			4.5 years
Expected volatility		49	%		50	%		49	%		50	%

For the three and six months ended June 30, 2010, the weighted average fair value per stock-settled appreciation right granted was $17.07 and $15.08, respectively. For the three and six months ended June 30, 2009, the weighted average fair value per equity award granted was $10.86.

WESCO recognized $3.6 million and $3.2 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended June 30, 2010 and 2009, respectively. WESCO recognized $7.1 million and $6.3 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the six months ended June 30, 2010 and 2009, respectively. As of June 30, 2010, there was $13.3 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $5.0 million is expected to be recognized over the remainder of 2010, $6.4 million in 2011, $1.9 million in 2012 and less than $0.1 million in 2013.

During the six months ended June 30, 2010 and 2009, the total intrinsic value of awards exercised was $1.7 million and $0.6 million, respectively, and the total amount of cash received from the exercise of options was $0.6 million and $0.3 million, respectively. The tax benefit associated with the exercise of awards for the six months ended June 30, 2010 and 2009 totaled $0.6 million and $0.2 million, respectively, and was recorded as a credit to additional capital.

The following table sets forth a summary of stock options and stock-settled stock appreciation rights and related information for the six months ended June 30, 2010:


				Weighted		Weighted Average
				Average		Remaining		Aggregate Intrinsic
				Exercise		Contractual Term		Value
	Awards			Price		(In Years)		(In Thousands)
Outstanding at December 31, 2009		4,226,153		$	35.30
Granted		24,000			34.08
Exercised		(77,524	)		13.47
Forfeited		(66,030	)		34.42

Outstanding at June 30, 2010		4,106,599			35.72		6.4	$	24,578

Exercisable at June 30, 2010		2,583,555		$	36.23		5.3	$	18,161

The following table sets forth a summary of restricted stock units and related information for the six months ended June 30, 2010:


				Weighted
				Average
				Fair
	Awards			Value
Unvested at December 31, 2009		243,942		$	25.37
Granted		—			—
Vested		(675	)		25.37
Forfeited		(3,085	)		25.37

Unvested at June 30, 2010		240,182		$	25.37

Earnings Per Share

6 Months Ended

Jun. 30, 2010

Earnings Per Share [Abstract]

EARNINGS PER SHARE

4. EARNINGS PER SHARE

Basic earnings per share are computed by dividing net income by the weighted average common shares outstanding during the periods. Diluted earnings per share are computed by dividing net income by the weighted average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of stock-based compensation and convertible debt.

The following table sets forth the details of basic and diluted earnings per share:


	Three Months Ended
	June 30,
	2010		2009
Amounts in thousands, except share and per share data
Net income reported	$	27,793	$	26,454

Weighted average common shares outstanding used in computing basic earnings per share		42,477,630		42,267,444
Common shares issuable upon exercise of dilutive stock options		808,023		473,656
Common shares issuable from contingently convertible debentures (see note below for basis of calculation)		2,756,454		—

Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share		46,042,107		42,741,100


Earnings per share:
Basic	$	0.65	$	0.63
Diluted	$	0.60	$	0.62


	Six Months Ended
	June 30,
	2010		2009
Amounts in thousands, except share and per share data
Net income reported	$	46,993	$	49,716

Weighted average common shares outstanding used in computing basic earnings per share		42,460,469		42,257,177
Common shares issuable upon exercise of dilutive stock options		694,861		359,913
Common shares issuable from contingently convertible debentures (see note below for basis of calculation)		1,843,267		—

Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share		44,998,597		42,617,090


Earnings per share:
Basic	$	1.11	$	1.18
Diluted	$	1.04	$	1.17

For the three months ended June 30, 2010 and 2009, the computation of diluted earnings per share excluded 1.8 million and 2.6 million, respectively, of stock-settled stock appreciation rights at weighted average exercise prices of $52 per share and $47 per share, respectively. For the six months ended June 30, 2010 and 2009, the computation of diluted earnings per share excluded stock-settled stock appreciation rights of 1.8 million and 3.0 million, respectively, at weighted average exercise prices of $52 per share and $43 per share, respectively. These amounts were excluded because their effect would have been antidilutive.

Because of WESCO’s obligation to settle the par value of the 2.625% Convertible Senior Debentures due 2025 (the “2025 Debentures”), the 1.75% Convertible Senior Debentures due 2026 (the “2026 Debentures”) and the 6.0% Convertible Senior Debentures due 2029 (the “2029 Debentures” and together with the 2025 Debentures and 2026 Debentures, the “Debentures”) in cash, WESCO is not required to include any shares underlying the Debentures in its diluted weighted average shares outstanding until the average stock price per share for the period exceeds the conversion price of the respective Debentures. At such time, only the number of shares that would be issuable (under the treasury stock method of accounting for share dilution) would be included, which is based upon the amount by which the average stock price exceeds the conversion price. The conversion prices of the 2029 Debentures, 2026 Debentures and 2025 Debentures are $28.87, $88.15 and $41.86, respectively. Share dilution is limited to a maximum of 11,951,939 shares for the 2029 Debentures, 2,507 shares for the 2026 Debentures and 2,205,434 shares for the 2025 Debentures. Since the average stock prices for the three and six month periods ended June 30, 2010 were $37.52 per share and $34.13 per share, respectively, 2,756,454 shares and 1,843,267 shares, respectively, underlying the 2029 Debentures were included in the diluted share count, and the effect on diluted earnings per share for both periods was a decrease of approximately $0.04. There was no impact of the Debentures on diluted earnings per share for the three and six month periods ended June 30, 2009.

Revolving Credit Facilty	6 Months Ended
Revolving Credit Facilty	Jun. 30, 2010
Revolving Credit Facilty [Abstract]
REVOLVING CREDIT FACILTY	5. REVOLVING CREDIT FACILTY At June 30, 2010, the aggregate borrowing capacity under the revolving credit facility was $375 million. The revolving credit facility consists of two separate sub-facilities: (i) a U.S. sub-facility and (ii) a Canadian sub-facility and includes a letter of credit sub-limit of up to $55 million. The facility matures on November 1, 2013 and is collateralized by the inventory of WESCO Distribution, Inc. (“WESCO Distribution”) and the inventory and accounts receivable of WESCO Distribution Canada, L.P. WESCO Distribution’s obligations under the revolving credit facility have been guaranteed by WESCO International, Inc. (“WESCO International”) and by certain of WESCO Distribution’s subsidiaries. On February 19, 2010, WESCO Distribution, along with certain of its subsidiaries, entered into a Limited Consent and Amendment No. 4 (the “Amendment”) to its Third Amended and Restated Revolving Credit Agreement, dated November 1, 2006 (the “Agreement”). The Amendment permits WESCO to complete certain legal entity restructuring actions, issue additional surety bonds and invest additional resources in foreign subsidiaries. In addition, the amendment enhances WESCO’s hedging capacities. Pursuant to the terms of the Amendment, WESCO agreed to modify the Applicable Margins (as defined in the Agreement) paid to the lenders on borrowings and letters of credit. Availability under the facility is limited to the amount of eligible U.S. and Canadian inventory and Canadian receivables applied against certain advance rates. Depending upon the amount of excess availability under the facility, interest will be calculated at LIBOR plus a margin that ranges between 2.25% and 2.875% or at the Index Rate (prime rate published by the Wall Street Journal) plus a margin that ranges between 1.00% and 1.625%. This change represented a 1.125% to 1.25% adjustment in borrowing margin over the previous rates. The fee for unused capacity associated with the facility was not changed and will range between 0.25% and 0.375%. As long as the average daily excess availability for both the preceding and projected succeeding 90-day period is greater than $50 million, WESCO would be permitted to make acquisitions and repurchase outstanding public stock and bonds. The above permitted transactions would also be allowed if such excess availability is between $25 million and $50 million and WESCO’s fixed charge coverage ratio, as defined by Agreement, is at least 1.25 to 1.0 after taking into consideration the permitted transaction. Additionally, if excess availability under the revolving credit facility is less than $60 million, then WESCO must maintain a fixed charge coverage ratio of 1.1 to 1.0. At June 30, 2010, WESCO had $28.0 million outstanding under the facility.

Equity Investment	6 Months Ended
Equity Investment	Jun. 30, 2010
Equity Investment [Abstract]
EQUITY INVESTMENT	6. EQUITY INVESTMENT During the first quarter of 2008, WESCO and Deutsch Engineered Connecting Devices, Inc. (“Deutsch”) completed a transaction with respect to WESCO’s LADD operations, which resulted in a joint venture in which Deutsch owned a 60% interest and WESCO owned a 40% interest. WESCO accounted for its investment in the joint venture using the equity method of accounting. Accordingly, earnings from the joint venture were recorded as other income in the consolidated statement of income. Deutsch was entitled, but not obliged, to acquire the remaining 40% after January 1, 2010. Deutsch paid to WESCO aggregate consideration of approximately $75.0 million, consisting of $60.0 million in cash plus a $15.0 million promissory note for its 60% interest in the joint venture. On January 15, 2010, WESCO received $1.8 million in accrued interest related to the promissory note for the period from January 2, 2008 to January 2, 2010. In addition, Deutsch and WESCO entered into an amended promissory note agreement. The amendment extended the maturity date for the payment of principal and interest to the earlier of (a) the closing date of Deutsch’s option to acquire the remaining 40% joint venture interest or (b) the maturity date of Deutsch’s credit facility or mezzanine financing facility. Interest accrued at a rate of 8.5% compounded annually. Management believed this rate was commensurate with a market rate of interest; therefore, no reserve or allowance was recorded against the promissory note. On April 30, 2010, Deutsch notified WESCO it would exercise its option to purchase the remaining 40% of the LADD joint venture. The option price for Deutsch to acquire the remaining 40% of the joint venture was determined based upon a multiple of trailing earnings, with a minimum purchase price of $40.0 million and maximum purchase price of $50.0 million. The investment in the LADD joint venture at March 31, 2010 was $43.4 million, and the estimated option exercise price was $40.0 million. As a result, WESCO recorded a pre-tax impairment loss of $3.4 million to selling, general and administrative expenses during the first quarter of 2010. On June 7, 2010, WESCO completed the sale of its 40% interest in the LADD joint venture and recorded an additional impairment charge of $0.4 million to selling, general and administrative expenses. WESCO received $40.0 million for its 40% interest plus $15.0 million for the outstanding promissory note and $0.5 million for accrued interest.

Other Financial Information

6 Months Ended

Jun. 30, 2010

Other Financial Information [Abstract]

OTHER FINANCIAL INFORMATION

11. OTHER FINANCIAL INFORMATION

WESCO Distribution, a wholly owned subsidiary of WESCO International, has outstanding $150.0 million in aggregate principal amount of 7.50% Senior Subordinated Notes due 2017 (the “2017 Notes”), and WESCO International has outstanding $92.3 million in aggregate principal amount of 2025 Debentures, $0.2 million in aggregate principal amount of 2026 Debentures and $345.0 million in aggregate principal amount of 2029 Debentures. The 2017 Notes are fully and unconditionally guaranteed by WESCO International on a subordinated basis to all existing and future senior indebtedness of WESCO International. The 2025 Debentures, 2026 Debentures and 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution.

Condensed consolidating financial information for WESCO International, WESCO Distribution and the non-guarantor subsidiaries is as follows:

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEETS


	June 30, 2010
					(In thousands)
							Consolidating
	WESCO		WESCO		Non-Guarantor		and Eliminating
	International, Inc.		Distribution, Inc.		Subsidiaries		Entries			Consolidated

Cash and cash equivalents	$	4	$	22,465	$	73,335	$	—		$	95,804
Trade accounts receivable, net		—		—		731,320		—			731,320
Inventories, net		—		318,339		213,147		—			531,486
Other current assets		32		4,532		52,578		—			57,142

Total current assets		36		345,336		1,070,380		—			1,415,752
Intercompany receivables, net		—		—		1,730,325		(1,730,325	)		—
Property, buildings and equipment, net		—		38,749		75,606		—			114,355
Intangible assets, net		—		8,252		69,373		—			77,625
Goodwill and other intangibles, net		—		240,537		636,336		—			876,873
Investments in affiliates and other noncurrent assets		1,899,211		3,180,831		38,375		(5,070,418	)		47,999

Total assets	$	1,899,247	$	3,813,705	$	3,620,395	$	(6,800,743	)	$	2,532,604


Accounts payable	$	—	$	385,590	$	155,116	$	—		$	540,706
Other current liabilities		113,059		14,219		110,329		—			237,607

Total current liabilities		113,059		399,809		265,445		—			778,313
Intercompany payables, net		545,863		1,184,462		—		(1,730,325	)		—
Long-term debt		165,730		179,677		138,405		—			483,812
Other noncurrent liabilities		23,241		155,866		40,018		—			219,125
Stockholders’ equity		1,051,354		1,893,891		3,176,527		(5,070,418	)		1,051,354

Total liabilities and stockholders’ equity	$	1,899,247	$	3,813,705	$	3,620,395	$	(6,800,743	)	$	2,532,604


	December 31, 2009
					(In thousands)
							Consolidating
	WESCO		WESCO		Non-Guarantor		and Eliminating
	International, Inc.		Distribution, Inc.		Subsidiaries		Entries			Consolidated

Cash and cash equivalents	$	3	$	16,924	$	95,402	$	—		$	112,329
Trade accounts receivable, net		—		—		635,754		—			635,754
Inventories, net		—		303,747		203,468		—			507,215
Other current assets		394		18,353		56,959		—			75,706

Total current assets		397		339,024		991,583		—			1,331,004
Intercompany receivables, net		—		—		1,560,850		(1,560,850	)		—
Property, buildings and equipment, net		—		38,819		77,490		—			116,309
Intangible assets, net		—		8,704		72,604		—			81,308
Goodwill and other intangibles, net		—		188,329		675,081		—			863,410
Investments in affiliates and other noncurrent assets		1,837,883		3,169,830		33,656		(4,939,207	)		102,162

Total assets	$	1,838,280	$	3,744,706	$	3,411,264	$	(6,500,057	)	$	2,494,193


Accounts payable	$	—	$	326,996	$	126,158	$	—		$	453,154
Short-term debt		—		—		—		—			—
Other current liabilities		99,528		37,080		91,072		—			227,680

Total current liabilities		99,528		364,076		217,230		—			680,834
Intercompany payables, net		554,257		1,006,593		—		(1,560,850	)		—
Long-term debt		164,679		348,952		84,238		—			597,869
Other noncurrent liabilities		23,527		192,661		3,013		—			219,201
Stockholders’ equity		996,289		1,832,424		3,106,783		(4,939,207	)		996,289

Total liabilities and stockholders’ equity	$	1,838,280	$	3,744,706	$	3,411,264	$	(6,500,057	)	$	2,494,193

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF INCOME


	Three Months Ended June 30, 2010
						(In thousands)
	WESCO		WESCO Distribution,			Non-Guarantor		Consolidating and
	International, Inc.		Inc.			Subsidiaries		Eliminating Entries			Consolidated

Net sales	$	—	$	701,505		$	576,377	$	(18,761	)	$	1,259,121
Cost of goods sold		—		565,868			469,062		(18,761	)		1,016,169
Selling, general and administrative expenses		34		124,718			61,225		—			185,977
Depreciation and amortization		—		2,614			3,006		—			5,620
Results of affiliates’ operations		35,085		34,916			—		(70,001	)		—
Interest expense, net		7,258		3,261			3,881		—			14,400
Other income		—		(1,778	)		—		—			(1,778	)
Provision for income taxes		—		6,653			4,287		—			10,940


Net income	$	27,793	$	35,085		$	34,916	$	(70,001	)	$	27,793


	Three Months Ended June 30, 2009
						(In thousands)
	WESCO		WESCO Distribution,			Non-Guarantor			Consolidating and
	International, Inc.		Inc.			Subsidiaries			Eliminating Entries			Consolidated

Net sales	$	—	$	785,493		$	373,725		$	—		$	1,159,218
Cost of goods sold		—		638,641			296,665			—			935,306
Selling, general and administrative expenses		2		129,201			40,711			—			169,914
Depreciation and amortization		—		6,605			(245	)		—			6,360
Results of affiliates’ operations		26,745		46,910			—			(73,655	)		—
Interest expense, net		289		28,022			(14,490	)		—			13,821
Other income		—		(1,101	)		—			—			(1,101	)
Provision for income taxes		—		4,290			4,174			—			8,464


Net income	$	26,454	$	26,745		$	46,910		$	(73,655	)	$	26,454

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF INCOME


	Six Months Ended June 30, 2010
						(In thousands)
	WESCO		WESCO Distribution,			Non-Guarantor		Consolidating and
	International, Inc.		Inc.			Subsidiaries		Eliminating Entries			Consolidated

Net sales	$	—	$	1,360,451		$	1,079,748	$	(32,479	)	$	2,407,720
Cost of goods sold		—		1,093,561			876,270		(32,479	)		1,937,352
Selling, general and administrative expenses		122		253,975			114,919		—			369,016
Depreciation and amortization		—		6,110			5,611		—			11,721
Results of affiliates’ operations		61,641		69,744			—		(131,385	)		—
Interest expense, net		14,526		7,006			6,398		—			27,930
Other income		—		(4,284	)		—		—			(4,284	)
Provision for income taxes		—		12,186			6,806		—			18,992


Net income	$	46,993	$	61,641		$	69,744	$	(131,385	)	$	46,993


	Six Months Ended June 30, 2009
						(In thousands)
	WESCO		WESCO Distribution,			Non-Guarantor			Consolidating and
	International, Inc.		Inc.			Subsidiaries			Eliminating Entries			Consolidated

Net sales	$	—	$	1,620,362		$	718,445		$	—		$	2,338,807
Cost of goods sold		—		1,311,366			565,397			—			1,876,763
Selling, general and administrative expenses		4		274,834			82,509			—			357,347
Depreciation and amortization		—		10,199			3,317			—			13,516
Results of affiliates’ operations		50,374		64,210			—			(114,584	)		—
Interest expense (income), net		654		31,556			(5,860	)		—			26,350
Other income		—		(2,727	)		—			—			(2,727	)
Provision for income taxes		—		8,970			8,872			—			17,842


Net income	$	49,716	$	50,374		$	64,210		$	(114,584	)	$	49,716

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS


	Six Months Ended June 30, 2010
	(In thousands)
	WESCO			WESCO Distribution,			Non-Guarantor			Consolidating and
	International, Inc.			Inc.			Subsidiaries			Eliminating Entries		Consolidated
Net cash provided (used) by operating activities	$	7,263		$	83,034		$	(21,541	)	$	—	$	68,756
Investing activities:
Capital expenditures		—			(5,784	)		(238	)		—		(6,022	)
Acquisition payments		—			(14,296	)		—			—		(14,296	)
Proceeds from sale of subsidiary		—			40,000			—			—		40,000
Collection of note receivable		—			15,000			—			—		15,000
Other		—			4,232			—			—		4,232

Net cash provided (used) by investing activities		—			39,152			(238	)		—		38,914
Financing activities:
Net repayments		(8,393	)		(106,389	)		—			—		(114,782	)
Equity transactions		1,131			—			—			—		1,131
Other		—			(10,256	)		—			—		(10,256	)

Net cash used by financing activities		(7,262	)		(116,645	)		—			—		(123,907	)

Effect of exchange rate changes on cash and cash equivalents		—			—			(288	)		—		(288	)

Net change in cash and cash equivalents		1			5,541			(22,067	)		—		(16,525	)
Cash and cash equivalents at the beginning of year		3			16,924			95,402			—		112,329

Cash and cash equivalents at the end of period	$	4		$	22,465		$	73,335		$	—	$	95,804


	Six Months Ended June 30, 2009
	(In thousands)
	WESCO			WESCO Distribution,			Non-Guarantor			Consolidating and
	International, Inc.			Inc.			Subsidiaries			Eliminating Entries		Consolidated
Net cash provided by operating activities	$	6,594		$	185,789		$	12,319		$	—	$	204,702
Investing activities:
Capital expenditures		—			(5,826	)		(398	)		—		(6,224	)
Acquisition payments		—			(122	)		—			—		(122	)
Equity income, net of distributions		—			1,039			—			—		1,039
Other		—			98			—			—		98

Net cash used by investing activities		—			(4,811	)		(398	)		—		(5,209	)
Financing activities:
Net repayments		(7,046	)		(166,062	)		(758	)		—		(173,866	)
Equity transactions		449			—			—			—		449
Other		—			(10,215	)		(1,890	)		—		(12,105	)

Net cash used by financing activities		(6,597	)		(176,277	)		(2,648	)		—		(185,522	)

Effect of exchange rate changes on cash and cash equivalents		—			—			2,981			—		2,981

Net change in cash and cash equivalents		(3	)		4,701			12,254			—		16,952
Cash and cash equivalents at the beginning of year		—			18,453			67,885			—		86,338

Cash and cash equivalents at the end of period	$	(3	)	$	23,154		$	80,139		$	—	$	103,290

Organization	6 Months Ended
Organization	Jun. 30, 2010
Organization [Abstract]
ORGANIZATION	1. ORGANIZATION WESCO International, Inc. and its subsidiaries (collectively, “WESCO”), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical supplies and equipment and is a provider of integrated supply procurement services with operations in the United States, Canada, Mexico, the United Kingdom, Singapore, China, Australia, Africa and the United Arab Emirates. WESCO currently operates approximately 380 branch locations and seven distribution centers (four in the United States and three in Canada).

Accounting Policies	6 Months Ended
Accounting Policies	Jun. 30, 2010
Accounting Policies [Abstract]
ACCOUNTING POLICIES	2. ACCOUNTING POLICIES Basis of Presentation The unaudited condensed consolidated financial statements of WESCO have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in WESCO’s 2009 Annual Report on Form 10-K filed with the SEC. The December 31, 2009 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States. The unaudited condensed consolidated balance sheet as of June 30, 2010, the unaudited condensed consolidated statements of income for the three and six months ended June 30, 2010 and 2009, respectively, and the unaudited condensed consolidated statements of cash flows for the six months ended June 30, 2010 and 2009, respectively, in the opinion of management, have been prepared on the same basis as the audited consolidated financial statements and include all adjustments necessary for the fair statement of the results of the interim periods. All adjustments reflected in the unaudited condensed consolidated financial statements are of a normal recurring nature unless indicated. Results for the interim periods presented are not necessarily indicative of the results to be expected for the full year. Recent Accounting Pronouncements Pronouncements issued by the Financial Accounting Standards Board (the “FASB”) or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to WESCO’s financial position, results of operations or cash flows.

Employee Benefit Plans	6 Months Ended
Employee Benefit Plans	Jun. 30, 2010
Employee Benefit Plans [Abstract]
EMPLOYEE BENEFIT PLANS	7. EMPLOYEE BENEFIT PLANS A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their services rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO will make contributions in an amount equal to 50% of the participant’s total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO will make contributions in an amount ranging from 1% to 7% of the participant’s eligible compensation based on years of continuous service. In addition, employer contributions may be made at the discretion of the Board of Directors. For the six months ended June 30, 2010 and 2009, WESCO incurred charges of $11.0 million and $5.0 million, respectively, for all such plans. Effective January 1, 2010, WESCO reinstated all discretionary contributions that had been suspended since August 1, 2009 with the exception of a certain group of employees comprised of corporate officers and others. Reinstatement for these employees will be contingent upon WESCO reaching certain financial objectives. Contributions are made in cash to all employee retirement savings plan accounts, except for the deferred compensation plan. Employees then have the option to transfer balances allocated to their accounts into any of the available investment options, including WESCO common stock.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2010
Commitments And Contingencies [Abstract]
COMMITMENTS AND CONTINGENCIES	8. COMMITMENTS AND CONTINGENCIES WESCO is a co-defendant in a lawsuit filed in a state court in Indiana in which a customer alleges that WESCO sold defective products manufactured or remanufactured by others and is seeking monetary damages in the amount of $52 million. WESCO has denied any liability, believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. Accordingly, no liability is recorded for this matter as of June 30, 2010.

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2010
Income Taxes [Abstract]
INCOME TAXES	10. INCOME TAXES The effective tax rate for the three months ended June 30, 2010 and 2009 was 28.2% and 24.2%, respectively, and the effective tax rate for the six months ended June 30, 2010 and 2009 was 28.8% and 26.4%, respectively. WESCO’s three and six month effective tax rates are lower than the federal statutory rate of 35% primarily due to benefits resulting from the recapitalization of Canadian operations, which are partially offset by nondeductible expenses, state taxes and foreign rate differences. The effective tax rate for the six months ended June 30, 2010 reflects discrete adjustments totaling $1.2 million related to changes in uncertain tax positions and discrete adjustments totaling $0.5 million associated with prior years’ taxes. The effective tax rate for the six months ended June 30, 2009 included a discrete benefit of $0.2 million related to prior years’ taxes. The total amount of unrecognized tax benefits was $8.5 million and $8.1 million as of June 30, 2010 and December 31, 2009, respectively. If these tax benefits were recognized in the consolidated financial statements, the portion of these amounts that would reduce WESCO’s effective tax rate would be $7.4 million and $7.1 million, respectively. During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits will decrease by $1.4 million due to the resolution of federal, state and foreign tax examinations. WESCO records interest related to uncertain tax positions as a part of interest expense in the consolidated statement of income. As of June 30, 2010 and December 31, 2009, WESCO had an accrued liability for interest related to uncertain tax positions of $4.8 million and $4.5 million, respectively. Penalties are recognized as part of income tax expense. There were no penalties recorded during the six months ended June 30, 2010.