WESCO International (WCC) 10-Q 6 May 14 2014 Q1 Quarterly report Financial data

DOCUMENT_AND_ENTITY_INFORMATIO

DOCUMENT AND ENTITY INFORMATION Document	3 Months Ended
	Mar. 31, 2014	5-May-14
Entity [Abstract]	'	'
Entity Registrant Name	'WESCO INTERNATIONAL INC.	'
Entity Central Index Key	'0000929008	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	44,440,840

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$96,356	$123,725
Trade accounts receivable, net of allowance for doubtful accounts of $19,682 and $19,309 in 2014 and 2013, respectively	1,105,297	1,045,054
Other accounts receivable	106,960	130,043
Inventories, net	811,095	787,324
Prepaid expenses and other current assets	140,191	119,469
Total current assets	2,259,899	2,205,615
Property, buildings and equipment, net of accumulated depreciation of $218,743 and $213,758 in 2014 and 2013, respectively	195,263	198,654
Intangible assets, net	449,180	439,167
Goodwill	1,752,112	1,734,391
Other assets	54,615	71,066
Total assets	4,711,069	4,648,893
Current Liabilities:	'	'
Accounts payable	781,819	735,097
Accrued payroll and benefit costs	39,741	56,548
Short-term debt	42,722	37,551
Current portion of long-term debt	2,458	2,510
Other current liabilities	219,432	219,957
Total current liabilities	1,086,172	1,051,663
Long-term debt, net of discount of $173,611 and $174,686 in 2014 and 2013, respectively	1,457,586	1,447,634
Other noncurrent liabilities	42,882	43,471
Deferred income taxes	350,870	341,334
Total liabilities	2,937,510	2,884,102
Commitments and Contingencies	'	'
Stockholders' Equity:	'	'
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	0	0
Additional capital	1,090,627	1,082,772
Retained earnings	1,419,919	1,368,386
Treasury stock, at cost; 18,229,729 and 18,179,275 shares in 2014 and 2013, respectively	-614,502	-610,430
Accumulated other comprehensive income	-123,043	-76,543
Total WESCO International stockholders' equity	1,773,559	1,764,791
Noncontrolling interest	-68	-18
Total stockholders' equity	1,773,627	1,764,809
Total liabilities and stockholders' equity	4,711,069	4,648,893
Common Stock [Member]	'	'
Stockholders' Equity:	'	'
Common stock	583	581
Common Class B [Member]	'	'
Stockholders' Equity:	'	'
Common stock	$43	$43

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts	$19,682	$19,309
Accumulated depreciation	218,743	213,758
Debt discount	$173,611	$174,686
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock, shares (in shares)	0	0
Common Stock [Member]	'	'
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized (in shares)	210,000,000	210,000,000
Common stock, shares, issued (in shares)	58,322,074	58,107,304
Common stock, shares outstanding (in shares)	44,432,109	44,267,460
Common Class B [Member]	'	'
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares, issued (in shares)	4,339,431	4,339,431
Common stock, shares outstanding (in shares)	0	0

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]	'	'
Net sales	$1,810,825	$1,808,059
Cost of goods sold	1,436,032	1,426,979
Selling, general and administrative expense	265,462	227,456
Depreciation and amortization	16,372	16,717
Income from operations	92,959	136,907
Interest expense, net	20,688	21,926
Income before income taxes	72,271	114,981
Provision for income taxes	20,416	30,887
Net income	51,855	84,094
Net (loss) income attributable to noncontrolling interest	-50	105
Net income attributable to WESCO International, Inc.	51,905	83,989
Comprehensive Income:	'	'
Foreign currency translation adjustment	-46,500	-23,481
Comprehensive income attributable to WESCO International, Inc.	$5,405	$60,508
Earnings per share attributable to WESCO International, Inc.	'	'
Basic (in dollars per share)	$1.17	$1.91
Diluted (in dollars per share)	$0.97	$1.60

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:	'	'
Net income	$51,855	$84,094
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	16,372	16,717
Deferred income taxes	7,864	20,093
Other operating activities, net	2,202	2,831
Changes in assets and liabilities	'	'
Trade receivables, net	-55,285	-61,816
Other accounts receivable	22,868	-12,456
Inventories, net	-17,373	-2,441
Prepaid expenses and other current assets	-19,668	30,160
Accounts payable	43,604	41,764
Accrued payroll and benefit costs	-16,854	-22,291
Other current and noncurrent liabilities	11,128	-16,262
Net cash provided by operating activities	46,713	80,393
Investing Activities:	'	'
Capital expenditures	-5,012	-5,974
Acquisition payments, net of cash acquired	-91,187	0
Other investing activities	39	4,944
Net cash used in investing activities	-96,160	-1,030
Financing Activities:	'	'
Proceeds from issuance of short-term debt	18,503	6,880
Repayments of short-term debt	-13,211	-1,305
Proceeds from issuance of long-term debt	404,922	275,135
Repayments of Long-term Debt	-390,232	-332,251
Other financing activities, net	3,557	2,471
Net cash used in financing activities	23,539	-49,070
Effect of exchange rate on cash and cash equivalents	-1,461	399
Net change in cash and cash equivalents	-27,369	30,692
Cash and cash equivalents at the beginning of period	123,725	86,099
Cash and cash equivalents at the end of period	$96,356	$116,791

ORGANIZATION

ORGANIZATION	3 Months Ended
	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
ORGANIZATION	'
	ORGANIZATION
	WESCO International, Inc. and its subsidiaries (collectively, “WESCO” or the "Company"), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating (“MRO”) and original equipment manufactures' (“OEM”) products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. We serve over 75,000 active customers globally, through approximately 475 full service branches and nine distribution centers located primarily in the United States, Canada and Mexico, with offices in 15 additional countries.

ACCOUNTING_POLICIES

ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
ACCOUNTING POLICIES	'
	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 2013 Annual Report on Form 10-K filed with the SEC. The December 31, 2013 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 March 31, 2014, the unaudited condensed consolidated statements of income and comprehensive income for the three months ended March 31, 2014 and 2013, respectively, and the unaudited condensed consolidated statements of cash flows for the three months ended March 31, 2014 and 2013, 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.
	Revision
	Certain amounts in the Company's consolidated balance sheet as of December 31, 2013, as presented herein, have been revised to appropriately present current and non-current deferred tax balances as well as current taxes refundable/payable in accordance with ASC 740.  Specifically, other assets and deferred income tax liabilities each increased by $24.7 million at December 31, 2013.  Additionally, prepaid expenses and other current assets increased by $7.1 million with a corresponding increase to other current liabilities of $7.1 million at December 31, 2013.  The Company will also revise its consolidated balance sheet as of December 31, 2012, which is not presented herein, for the same items.  Deferred income tax assets and liabilities will each increase by $16.2 million to $17.5 million and $316.7 million, respectively, at December 31, 2012.  Income taxes receivable and other current liabilities will each increase by $6.0 million to $14.8 million and $140.6 million, respectively, at December 31, 2012.
	Fair Value of Financial Instruments
	The Company measures the fair value of financial assets and liabilities based on the guidance of ASC 820, "Fair Value Measurements and Disclosures," which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.
	ASC 820 establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. ASC 820 describes three levels of inputs that may be used to measure fair value:
	Level 1 inputs are quoted prices in active markets for identical assets or liabilities.
	Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities.
	Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	At March 31, 2014, the carrying value of WESCO’s 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $175.0 million and the fair value was approximately $1,027.5 million. At December 31, 2013, the carrying value of WESCO’s 2029 Debentures was $174.1 million and the fair value was approximately $1,124.3 million. The fair value of WESCO’s 2029 Debentures is based on quoted prices in active markets and is therefore classified as Level 1 within the valuation hierarchy. The reported carrying amounts of WESCO’s other debt instruments approximate their fair values and are classified as Level 2 within the valuation hierarchy. Other debt instruments included in Level 2 are valued using a market approach, utilizing interest rates and other relevant information generated by market transactions involving similar instruments.
	Recently Issued Accounting Pronouncements
	In July 2013, the FASB issued updated guidance on the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This updated guidance requires entities to present unrecognized tax benefits, or a portion of unrecognized tax benefits, in the financial statements as a reduction to deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, with certain exceptions. This guidance is effective for interim and annual periods beginning after December 15, 2013. WESCO adopted this guidance in 2014. Adoption of this guidance did not have a material impact on WESCO's financial position, results of operations or cash flows.

ACQUISITIONS

ACQUISITIONS	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
ACQUISITIONS	'
	ACQUISITIONS
	The following table sets forth the consideration paid for acquisitions:
		Three months ended March 31, 2014
	(In thousands)
	Fair value of assets acquired	$	104,601
	Fair value of liabilities assumed	13,414
	Cash paid for acquisitions	$	91,187
	The fair values of assets acquired and liabilities assumed were based upon preliminary calculations and valuations and our estimates and assumptions for our acquisitions are subject to change as we obtain additional information for our estimates during the respective measurement periods (up to one year from the respective acquisition dates).
	2014 Acquisitions of LaPrairie, Inc. and Hazmasters, Inc.
	On February 3, 2014, WESCO Distribution, Inc., through its wholly-owned Canadian subsidiary, completed the acquisition of LaPrairie, Inc. ("LaPrairie"), a wholesale distributor of electrical products that services the transmission, distribution, and substation needs of utilities and utility contractors with approximately $30 million in annual sales from a single location in Newmarket, Ontario. WESCO funded the purchase price paid at closing with cash. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The preliminary fair value of intangibles was estimated by management and the allocation resulted in intangible assets of $11.3 million and goodwill of $8.6 million. Management believes the majority of goodwill will be deductible for tax purposes.
	On March 17, 2014, WESCO Distribution, Inc., through its wholly-owned Canadian subsidiary, completed the acquisition of Hazmasters, Inc. ("Hazmasters"), a leading independent Canadian distributor of safety products servicing customers in the industrial, construction, commercial, institution, and government markets with approximately $80 million in annual sales from 14 branches across Canada. WESCO funded the purchase price paid at closing with cash and borrowings under the Revolving Credit Facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The preliminary fair value of intangibles was estimated by management and the allocation resulted in intangible assets of $17.7 million and goodwill of $35.2 million which is not deductible for tax purposes.

STOCKBASED_COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
STOCK-BASED COMPENSATION	'
	STOCK-BASED COMPENSATION
	WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards. 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 months ended March 31, 2014 and 2013, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted average assumptions:
		Three Months Ended March 31,
		2014			2013
	Stock-settled appreciation rights granted	272,213			246,124
	Restricted stock units granted	62,506			69,393
	Performance-based awards granted	44,046			48,058
	Risk free interest rate	1.5	%		0.9	%
	Expected life (in years)	5			5
	Expected volatility	39	%		50	%
	For the three months ended March 31, 2014 and 2013, the weighted average fair value per stock-settled appreciation right granted was $30.66 and $31.33, respectively. For the three months ended March 31, 2014 and 2013, the weighted average fair value per restricted stock unit granted was $85.35 and $72.15, respectively. For the three months ended March 31, 2014 and 2013, the weighted average fair value per performance-based award granted was $86.65 and $78.21, respectively.
	The following table sets forth a summary of stock options and stock-settled stock appreciation rights and related information for the three months ended March 31, 2014:
		Awards			Weighted		Weighted	Aggregate
					Average		Average	Intrinsic
					Exercise		Remaining	Value
					Price		Contractual Term (In Years)	(In thousands)
	Outstanding at December 31, 2013	2,715,651			$	45.93
	Granted	272,213			85.35
	Exercised	(315,218	)		38.18
	Forfeited	(2,255	)		67.55
	Outstanding at March 31, 2014	2,670,391			50.84		6	$	87,041
	Exercisable at March 31, 2014	2,142,301			$	44.31	5.2	$	83,354
	The following table sets forth a summary of restricted stock units and related information for the three months ended March 31, 2014:
		Awards			Weighted
					Average
					Fair
					Value
	Unvested at December 31, 2013	184,746			$	66.08
	Granted	62,506			85.35
	Vested	(47,431	)		60.05
	Forfeited	(1,230	)		67.39
	Unvested at March 31, 2014	198,591			$	73.58
	Performance shares are awards for which the vesting will occur based on market or performance conditions. The following table sets forth a summary of performance-based awards for the three months ended March 31, 2014:
		Awards			Weighted
					Average
					Fair
					Value
	Unvested at December 31, 2013	92,484			$	76.98
	Granted	44,046			86.65
	Vested	—			—
	Forfeited	(1,536	)		76.61
	Unvested at March 31, 2014	134,994			$	80.14
	The performance-based awards in the table above include 67,497 shares in which vesting of the ultimate number of shares underlying such awards is dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are valued based upon a Monte Carlo simulation model, which is a valuation model that represents the characteristics of these grants. The probability of meeting the market criteria was considered when calculating the estimated fair market value on the date of grant. These awards are accounted for as awards with market conditions, in which compensation cost is recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.
	The fair value of the performance shares granted during the three months ended March 31, 2014 were estimated using the following weighted-average assumptions:
	Weighted Average Assumptions
	Grant date share price	$	86.65
	WESCO expected volatility	35.4		%
	Peer group median volatility	28.7		%
	Risk-free interest rate	0.62		%
	Correlation	103.1		%
	Vesting of the remaining 67,497 shares of performance-based awards in the table above is dependent upon the three-year average growth rate of WESCO's net income. These awards are valued based upon the grant-date closing price of WESCO's common stock. These awards are accounted for as awards with performance conditions, in which compensation cost is recognized over the performance period based upon WESCO's determination of whether it is probable that the performance targets will be achieved.
	WESCO recognized $4.2 million and $4.0 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended March 31, 2014 and 2013, respectively. As of March 31, 2014, there was $30.3 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $12.5 million is expected to be recognized over the remainder of 2014, $11.2 million in 2015, $5.9 million in 2016 and $0.7 million in 2017.
	During the three months ended March 31, 2014 and 2013, the total intrinsic value of awards exercised was $18.4 million and $4.1 million, respectively. The total amount of cash received from the exercise of options was $0.8 million for the three months ended March 31, 2014 and less than $0.1 million for the three months ended March 31, 2013. The tax benefit associated with the exercise of awards for the three months ended March 31, 2014 and 2013 totaled $7.0 million and $0.4 million, respectively, and was recorded as an increase to additional capital.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
EARNINGS PER SHARE	'
	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
		March 31,
		2014		2013
	Net income attributable to WESCO International, Inc.	$	51,905	$	83,989
	Weighted average common shares outstanding used in computing basic earnings per share	44,348		44,085
	Common shares issuable upon exercise of dilutive equity awards	1,099		1,099
	Common shares issuable from contingently convertible debentures (see below for basis of calculation)	7,926		7,226
	Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	53,373		52,410
	Earnings per share attributable to WESCO International, Inc.
	Basic	$	1.17	$	1.91
	Diluted	$	0.97	$	1.6
	For the three months ended March 31, 2014 and 2013, the computation of diluted earnings per share attributable to WESCO International, Inc. excluded 0.5 million stock-settled stock appreciation rights at weighted average exercise prices of $79.13 per share and $69.18 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 2029 Debentures in cash upon conversion, WESCO is required to include shares underlying the 2029 Debentures in its diluted weighted average shares outstanding when the average stock price per share for the period exceeds the conversion price of the respective debentures. Only the number of shares issuable under the treasury stock method of accounting for share dilution are included, which is based upon the amount by which the average stock price exceeds the conversion price. The conversion price of the 2029 Debentures is $28.87. Share dilution is limited to a maximum of 11,948,513 shares for the 2029 Debentures. For the three months ended March 31, 2014 and 2013, the effect of the 2029 Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.17 and $0.26, respectively.

EMPLOYEE_BENEFIT_PLANS

EMPLOYEE BENEFIT PLANS	3 Months Ended
	Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]	'
EMPLOYEE BENEFIT PLANS	'
	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 three months ended March 31, 2014 and 2013, WESCO incurred charges of $4.8 million and $10.3 million, respectively, for all such plans. Contributions are made in cash to defined contribution retirement savings plans. The deferred compensation plan is an unfunded plan. Employees have the option to transfer balances allocated to their accounts in the defined contribution retirement savings plan and the deferred compensation plan into any of the available investment options. An investment option for employees in the defined contribution retirement savings plan is WESCO common stock.
	In connection with the December 14, 2012 acquisition of EECOL, the Company assumed a contributory defined benefit plan covering substantially all Canadian employees of EECOL and a Supplemental Executive Retirement Plan for certain executives of EECOL. The following table reflects the components of net periodic benefit costs for the Company's defined benefit plans for the three months ended March 31, 2014 and 2013:
		Three Months Ended
		March 31,
		2014			2013
	Service cost	$	900		$	1,033
	Interest cost	1,156			1,160
	Expected return on plan assets	(1,361		)	(960		)
	Net periodic benefit cost	$	695		$	1,233
	During the three months ended March 31, 2014 and 2013, the Company made cash contributions of $0.8 million and $0.9 million, respectively, to its defined benefit plans.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES
	As initially reported in our 2008 Annual Report on Form 10-K, WESCO is a defendant in a lawsuit filed in a state court in Indiana in which a customer, ArcelorMittal Indiana Harbor, Inc. (“AIH”), alleges that the Company sold defective products to AIH in 2004 that were supplied to the Company by others.  The lawsuit sought monetary damages in the amount of approximately $50 million.  On February 14, 2013, the jury returned a verdict in favor of AIH and awarded damages in the amount of approximately $36.1 million, and judgment was entered on the jury's verdict.  As a result, the Company recorded a $36.1 million charge to selling, general and administrative expenses in 2012. The Company disputes this outcome and filed a post-trial motion challenging the verdict alleging various errors that occurred during trial.  The Company received letters from its insurers confirming insurance coverage of the matter and recorded a receivable in the quarter ended March 31, 2013 in an amount equal to the previously recorded liability. AIH also filed a post-trial motion asking the court to award additional amounts to AIH, including prejudgment and post-judgment interest.  The Court denied the Company's post-trial motion on June 28, 2013 and granted in part AIH's motion, awarding prejudgment interest in the amount of $3.9 million and ordering post-judgment interest to accrue on the entire judgment at 8% per annum. In the quarter ended June 30, 2013, the Company received letters from its insurers confirming insurance coverage of all prejudgment and post-judgment interest related to the matter. Final judgment was entered by the court on July 16, 2013, and the Company is appealing the judgment. As of March 31, 2014, the Company recorded a liability and a corresponding receivable in the amount of $7.1 million for all prejudgment and post-judgment interest accrued in connection with this matter. The judgment may increase or decrease based on the outcome of the appellate proceedings that cannot be predicted with certainty.

INCOME_TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	The effective tax rate for the three months ended March 31, 2014 and 2013 was 28.2% and 26.9% respectively. WESCO’s effective tax rate is lower than the federal statutory rate of 35% primarily due to benefits resulting from the tax effect of intercompany financing and lower rates on foreign earnings, which are partially offset by nondeductible expenses and state taxes. The effective tax rate for the three months ended March 31, 2014 and March 31, 2013 reflect beneficial discrete adjustments totaling $0.1 million in each period, primarily related to changes in state tax rates and changes in uncertain tax positions. There have been no material adjustments to liabilities relating to uncertain tax positions since the last annual disclosure for the year ended December 31, 2013.

OTHER_FINANCIAL_INFORMATION

OTHER FINANCIAL INFORMATION	3 Months Ended
	Mar. 31, 2014
Condensed Financial Information [Abstract]	'
OTHER FINANCIAL INFORMATION	'
	OTHER FINANCIAL INFORMATION
	WESCO International, Inc. ("WESCO International") has outstanding $344.9 million in aggregate principal amount of 2029 Debentures. The 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution, a 100% owned subsidiary of WESCO International, on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution.
	WESCO Distribution has $500 million aggregate principal amount of 2021 Notes. The 2021 Notes are unsecured senior obligations of WESCO Distribution and are guaranteed on a senior unsecured basis by WESCO International.
	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
	(unaudited)
		March 31, 2014
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and
		Inc.			Inc.						Eliminating
											Entries
	Cash and cash equivalents	$	—		$	47,452		$	48,904		$	—		$	96,356
	Trade accounts receivable, net	—			—			1,105,297			—			1,105,297
	Inventories, net	—			357,462			453,633			—			811,095
	Other current assets	—			161,965			130,543			(45,357		)	247,151
	Total current assets	—			566,879			1,738,377			(45,357		)	2,259,899
	Intercompany receivables, net	—			—			1,880,905			(1,880,905		)	—
	Property, buildings and equipment, net	—			58,064			137,199			—			195,263
	Intangible assets, net	—			5,238			443,942			—			449,180
	Goodwill	—			246,771			1,505,341			—			1,752,112
	Investments in affiliates	3,147,129			3,717,115			—			(6,864,244		)	—
	Other noncurrent assets	4,291			15,013			35,311			—			54,615
	Total assets	$	3,151,420		$	4,609,080		$	5,741,075		$	(8,790,506	)	$	4,711,069
	Accounts payable	$	—		$	444,869		$	336,950		$	—		$	781,819
	Short-term debt	—			—			42,722			—			42,722
	Other current liabilities	8,159			110,151			188,678			(45,357		)	261,631
	Total current liabilities	8,159			555,020			568,350			(45,357		)	1,086,172
	Intercompany payables, net	1,173,676			707,229			—			(1,880,905		)	—
	Long-term debt	174,974			675,186			607,426			—			1,457,586
	Other noncurrent liabilities	20,984			229,891			142,877			—			393,752
	Total WESCO International stockholders' equity	1,773,627			2,441,754			4,422,490			(6,864,244		)	1,773,627
	Noncontrolling interest	—			—			(68		)	—			(68		)
	Total liabilities and stockholders’ equity	$	3,151,420		$	4,609,080		$	5,741,075		$	(8,790,506	)	$	4,711,069
	WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
	CONDENSED CONSOLIDATING BALANCE SHEETS
	(unaudited)
		December 31, 2013
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and
		Inc.			Inc.						Eliminating
											Entries
	Cash and cash equivalents	$	—		$	31,695		$	92,030		$	—		$	123,725
	Trade accounts receivable, net	—			—			1,045,054			—			1,045,054
	Inventories, net	—			351,242			436,082			—			787,324
	Other current assets	22			166,540			127,439			(44,489		)	249,512
	Total current assets	22			549,477			1,700,605			(44,489		)	2,205,615
	Intercompany receivables, net	—			—			1,906,785			(1,906,785		)	—
	Property, buildings and equipment, net	—			59,569			139,085			—			198,654
	Intangible assets, net	—			5,404			433,763			—			439,167
	Goodwill	—			246,125			1,488,266			—			1,734,391
	Investments in affiliates	3,137,418			3,722,902			—			(6,860,320		)	—
	Other noncurrent assets	4,361			15,627			51,078			—			71,066
	Total assets	$	3,141,801		$	4,599,104		$	5,719,582		$	(8,811,594	)	$	4,648,893
	Accounts payable	$	—		$	410,017		$	325,080		$	—		$	735,097
	Short-term debt	—			—			37,551			—			37,551
	Other current liabilities	11,920			114,894			196,690			(44,489		)	279,015
	Total current liabilities	11,920			524,911			559,321			(44,489		)	1,051,663
	Intercompany payables, net	1,168,507			738,278			—			(1,906,785		)	—
	Long-term debt	174,149			675,424			598,061			—			1,447,634
	Other noncurrent liabilities	22,416			220,650			141,739			—			384,805
Total WESCO International stockholders' equity	1,764,809			2,439,841			4,420,479			(6,860,320		)	1,764,809
Noncontrolling interest	—			—			(18		)	—			(18		)
Total liabilities and stockholders’ equity	$	3,141,801		$	4,599,104		$	5,719,582		$	(8,811,594	)	$	4,648,893
WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
(unaudited)
	Three Months Ended March 31, 2014
	(In thousands)
	WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
	International,			Distribution,			Subsidiaries			and
	Inc.			Inc.						Eliminating
										Entries
Net sales	$	—		$	829,471		$	1,007,453		$	(26,099	)	$	1,810,825
Cost of goods sold	—			658,584			803,547			(26,099		)	1,436,032
Selling, general and administrative expenses	—			136,680			128,782			—			265,462
Depreciation and amortization	—			4,700			11,672			—			16,372
Results of affiliates’ operations	56,210			40,713			—			(96,923		)	—
Interest expense, net	6,070			18,761			(4,143		)	—			20,688
Provision for income taxes	(1,715		)	3,047			19,084			—			20,416
Net income	51,855			48,412			48,511			(96,923		)	51,855
Less: Net loss attributable to noncontrolling interest	—			—			(50		)	—			(50		)
Net income attributable to WESCO International, Inc.	$	51,855		$	48,412		$	48,561		$	(96,923	)	$	51,905
Comprehensive income:
Foreign currency translation adjustment	(46,500		)	(46,500		)	(46,500		)	93,000			(46,500		)
Comprehensive income attributable to WESCO International, Inc.	$	5,355		$	1,912		$	2,061		$	(3,923	)	$	5,405
	Three Months Ended March 31, 2013
	(In thousands)
	WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
	International,			Distribution,			Subsidiaries			and
	Inc.			Inc.						Eliminating
										Entries
Net sales	$	—		$	820,235		$	1,018,864		$	(31,040	)	$	1,808,059
Cost of goods sold	—			650,127			807,892			(31,040		)	1,426,979
Selling, general and administrative expenses	4			100,517			126,935			—			227,456
Depreciation and amortization	—			4,103			12,614			—			16,717
Results of affiliates’ operations	88,453			46,453			—			(134,906		)	—
Interest expense, net	5,955			18,726			(2,755		)	—			21,926
Provision for income taxes	(1,600		)	12,242			20,245			—			30,887
Net income	84,094			80,973			53,933			(134,906		)	84,094
Less: Net income attributable to noncontrolling interest	—			—			105			—			105
Net income attributable to WESCO International, Inc.	$	84,094		$	80,973		$	53,828		$	(134,906	)	$	83,989
Comprehensive income:
Foreign currency translation adjustment	(23,481		)	(23,481		)	(23,481		)	46,962			(23,481		)
Comprehensive income attributable to WESCO International, Inc.	$	60,613		$	57,492		$	30,347		$	(87,944	)	$	60,508
WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
(unaudited)
	Three Months Ended March 31, 2014
	(In thousands)
	WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
	International,			Distribution,			Subsidiaries			and Eliminating
	Inc.			Inc.						Entries
Net cash (used) provided by operating activities	$	(4,871	)	$	20,415		$	31,169		$	—		$	46,713
Investing activities:
Capital expenditures	—			(3,347		)	(1,665		)	—			(5,012		)
Acquisition payments	—			—			(91,187		)	—			(91,187		)
Other				(5,169		)	39			5,169			39
Net cash used in investing activities	—			(8,516		)	(92,813		)	5,169			(96,160		)
Financing activities:
Borrowings	5,168			307,851			115,575			(5,169		)	423,425
Repayments	—			(307,851		)	(95,592		)				(403,443		)
Other	(297		)	3,858			(4		)	—			3,557
Net cash provided by financing activities	4,871			3,858			19,979			(5,169		)	23,539
Effect of exchange rate changes on cash and cash equivalents	—			—			(1,461		)	—			(1,461		)
Net change in cash and cash equivalents	—			15,757			(43,126		)	—			(27,369		)
Cash and cash equivalents at the beginning of year	—			31,695			92,030			—			123,725
Cash and cash equivalents at the end of period	$	—		$	47,452		$	48,904		$	—		$	96,356
WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
(unaudited)
	Three Months Ended March 31, 2013
	(In thousands)
	WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
	International,			Distribution,			Subsidiaries			and Eliminating
	Inc.			Inc.						Entries
Net cash (used) provided by operating activities	$	(15,594	)	$	38,857		$	57,130		$	—		$	80,393
Investing activities:
Capital expenditures	—			(5,300		)	(674		)	—			(5,974		)
Acquisition payments	—			—			—			—			—
Other	—			(16,291		)	4,944			16,291			4,944
Net cash (used) provided by investing activities	—			(21,591		)	4,270			16,291			(1,030		)
Financing activities:
Borrowings	16,291			176,922			105,093			(16,291		)	282,015
Repayments	—			(188,922		)	(144,634		)	—			(333,556		)
Other	(697		)	3,660			(492		)	—			2,471
Net cash provided (used) by financing activities	15,594			(8,340		)	(40,033		)	(16,291		)	(49,070		)
Effect of exchange rate changes on cash and cash equivalents	—			—			399			—			399
Net change in cash and cash equivalents	—			8,926			21,766			—			30,692
Cash and cash equivalents at the beginning of year	—			52,275			33,824			—			86,099
Cash and cash equivalents at the end of period	$	—		$	61,201		$	55,590		$	—		$	116,791
The Company revised its condensed consolidating balance sheet as of December 31, 2013 to properly reflect balance sheet positions of the Company's tax-paying entities and to conform with the current period's financial statement presentation. Specifically, other assets and deferred income taxes of non-guarantor subsidiaries each increased by $24.7 million at December 31, 2013. Additionally, prepaid expenses and other current assets of non-guarantor subsidiaries increased by $7.1 million, with a corresponding increase in other current liabilities of non-guarantor subsidiaries of $7.1 million at December 31, 2013.
The Company revised its condensed consolidating statements of income and comprehensive income for interest expense related to intercompany borrowings, increasing interest expense of WESCO Distribution by $6.4 million and decreasing interest expense of non-guarantor subsidiaries by $6.4 million for the period ended March 31, 2013. In addition, the Company revised its methodology for allocating income tax expense during interim reporting periods, resulting in a decrease in income tax expense of WESCO International by $1.6 million, a decrease in income tax expense of WESCO Distribution by $17.1 million and an increase in income tax expense of non-guarantor subsidiaries by $18.7 million for the period ended March 31, 2013.
The Company revised its condensed statement of cash flows for the period ended March 31, 2013 to reflect a $1.6 million advance from WESCO Distribution to WESCO International.
The impact of the revisions noted above, which the Company has determined is not material to the consolidated financial statements taken as a whole, did not have any impact on the consolidated amounts previously reported, nor did they impact the Company's obligations under the 2029 Debentures.

ACCOUNTING_POLICIES_Policies

ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	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 2013 Annual Report on Form 10-K filed with the SEC. The December 31, 2013 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 March 31, 2014, the unaudited condensed consolidated statements of income and comprehensive income for the three months ended March 31, 2014 and 2013, respectively, and the unaudited condensed consolidated statements of cash flows for the three months ended March 31, 2014 and 2013, 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.
Reclassification	'
	Revision
	Certain amounts in the Company's consolidated balance sheet as of December 31, 2013, as presented herein, have been revised to appropriately present current and non-current deferred tax balances as well as current taxes refundable/payable in accordance with ASC 740.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The Company measures the fair value of financial assets and liabilities based on the guidance of ASC 820, "Fair Value Measurements and Disclosures," which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.
	ASC 820 establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. ASC 820 describes three levels of inputs that may be used to measure fair value:
	Level 1 inputs are quoted prices in active markets for identical assets or liabilities.
	Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities.
	Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	At March 31, 2014, the carrying value of WESCO’s 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $175.0 million and the fair value was approximately $1,027.5 million. At December 31, 2013, the carrying value of WESCO’s 2029 Debentures was $174.1 million and the fair value was approximately $1,124.3 million. The fair value of WESCO’s 2029 Debentures is based on quoted prices in active markets and is therefore classified as Level 1 within the valuation hierarchy. The reported carrying amounts of WESCO’s other debt instruments approximate their fair values and are classified as Level 2 within the valuation hierarchy. Other debt instruments included in Level 2 are valued using a market approach, utilizing interest rates and other relevant information generated by market transactions involving similar instruments.

ACQUISITIONS_Tables

ACQUISITIONS (Tables)	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Business Acquisition, Pro Forma Information [Table Text Block]	'

STOCKBASED_COMPENSATION_Tables

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
	During the three months ended March 31, 2014 and 2013, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted average assumptions:
		Three Months Ended March 31,
		2014			2013
	Stock-settled appreciation rights granted	272,213			246,124
	Restricted stock units granted	62,506			69,393
	Performance-based awards granted	44,046			48,058
	Risk free interest rate	1.5	%		0.9	%
	Expected life (in years)	5			5
	Expected volatility	39	%		50	%
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]	'
	The following table sets forth a summary of stock options and stock-settled stock appreciation rights and related information for the three months ended March 31, 2014:
		Awards			Weighted		Weighted	Aggregate
					Average		Average	Intrinsic
					Exercise		Remaining	Value
					Price		Contractual Term (In Years)	(In thousands)
	Outstanding at December 31, 2013	2,715,651			$	45.93
	Granted	272,213			85.35
	Exercised	(315,218	)		38.18
	Forfeited	(2,255	)		67.55
	Outstanding at March 31, 2014	2,670,391			50.84		6	$	87,041
	Exercisable at March 31, 2014	2,142,301			$	44.31	5.2	$	83,354
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	'
	The following table sets forth a summary of restricted stock units and related information for the three months ended March 31, 2014:
		Awards			Weighted
					Average
					Fair
					Value
	Unvested at December 31, 2013	184,746			$	66.08
	Granted	62,506			85.35
	Vested	(47,431	)		60.05
	Forfeited	(1,230	)		67.39
	Unvested at March 31, 2014	198,591			$	73.58
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	'
	The following table sets forth a summary of performance-based awards for the three months ended March 31, 2014:
		Awards			Weighted
					Average
					Fair
					Value
	Unvested at December 31, 2013	92,484			$	76.98
	Granted	44,046			86.65
	Vested	—			—
	Forfeited	(1,536	)		76.61
	Unvested at March 31, 2014	134,994			$	80.14
Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]	'
	The fair value of the performance shares granted during the three months ended March 31, 2014 were estimated using the following weighted-average assumptions:
	Weighted Average Assumptions
	Grant date share price	$	86.65
	WESCO expected volatility	35.4		%
	Peer group median volatility	28.7		%
	Risk-free interest rate	0.62		%
	Correlation	103.1		%

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
	The following table sets forth the details of basic and diluted earnings per share:
		Three Months Ended
		March 31,
		2014		2013
	Net income attributable to WESCO International, Inc.	$	51,905	$	83,989
	Weighted average common shares outstanding used in computing basic earnings per share	44,348		44,085
	Common shares issuable upon exercise of dilutive equity awards	1,099		1,099
	Common shares issuable from contingently convertible debentures (see below for basis of calculation)	7,926		7,226
	Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	53,373		52,410
	Earnings per share attributable to WESCO International, Inc.
	Basic	$	1.17	$	1.91
	Diluted	$	0.97	$	1.6

EMPLOYEE_BENEFIT_PLANS_Schedul

EMPLOYEE BENEFIT PLANS Schedule of Net Benefit Costs (Tables)	3 Months Ended
	Mar. 31, 2014
Postemployment Benefits [Abstract]	'
Schedule of Net Benefit Costs [Table Text Block]	'
	The following table reflects the components of net periodic benefit costs for the Company's defined benefit plans for the three months ended March 31, 2014 and 2013:
		Three Months Ended
		March 31,
		2014			2013
	Service cost	$	900		$	1,033
	Interest cost	1,156			1,160
	Expected return on plan assets	(1,361		)	(960		)
	Net periodic benefit cost	$	695		$	1,233

OTHER_FINANCIAL_INFORMATION_Ta

OTHER FINANCIAL INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2014
Condensed Financial Information [Abstract]	'
Condensed Financial Information Statements Of Financial Condition [Text Block]	'
	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
	(unaudited)
		March 31, 2014
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and
		Inc.			Inc.						Eliminating
											Entries
	Cash and cash equivalents	$	—		$	47,452		$	48,904		$	—		$	96,356
	Trade accounts receivable, net	—			—			1,105,297			—			1,105,297
	Inventories, net	—			357,462			453,633			—			811,095
	Other current assets	—			161,965			130,543			(45,357		)	247,151
	Total current assets	—			566,879			1,738,377			(45,357		)	2,259,899
	Intercompany receivables, net	—			—			1,880,905			(1,880,905		)	—
	Property, buildings and equipment, net	—			58,064			137,199			—			195,263
	Intangible assets, net	—			5,238			443,942			—			449,180
	Goodwill	—			246,771			1,505,341			—			1,752,112
	Investments in affiliates	3,147,129			3,717,115			—			(6,864,244		)	—
	Other noncurrent assets	4,291			15,013			35,311			—			54,615
	Total assets	$	3,151,420		$	4,609,080		$	5,741,075		$	(8,790,506	)	$	4,711,069
	Accounts payable	$	—		$	444,869		$	336,950		$	—		$	781,819
	Short-term debt	—			—			42,722			—			42,722
	Other current liabilities	8,159			110,151			188,678			(45,357		)	261,631
	Total current liabilities	8,159			555,020			568,350			(45,357		)	1,086,172
	Intercompany payables, net	1,173,676			707,229			—			(1,880,905		)	—
	Long-term debt	174,974			675,186			607,426			—			1,457,586
	Other noncurrent liabilities	20,984			229,891			142,877			—			393,752
	Total WESCO International stockholders' equity	1,773,627			2,441,754			4,422,490			(6,864,244		)	1,773,627
	Noncontrolling interest	—			—			(68		)	—			(68		)
	Total liabilities and stockholders’ equity	$	3,151,420		$	4,609,080		$	5,741,075		$	(8,790,506	)	$	4,711,069
	WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
	CONDENSED CONSOLIDATING BALANCE SHEETS
	(unaudited)
		December 31, 2013
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and
		Inc.			Inc.						Eliminating
											Entries
	Cash and cash equivalents	$	—		$	31,695		$	92,030		$	—		$	123,725
	Trade accounts receivable, net	—			—			1,045,054			—			1,045,054
	Inventories, net	—			351,242			436,082			—			787,324
	Other current assets	22			166,540			127,439			(44,489		)	249,512
	Total current assets	22			549,477			1,700,605			(44,489		)	2,205,615
	Intercompany receivables, net	—			—			1,906,785			(1,906,785		)	—
	Property, buildings and equipment, net	—			59,569			139,085			—			198,654
	Intangible assets, net	—			5,404			433,763			—			439,167
	Goodwill	—			246,125			1,488,266			—			1,734,391
	Investments in affiliates	3,137,418			3,722,902			—			(6,860,320		)	—
	Other noncurrent assets	4,361			15,627			51,078			—			71,066
	Total assets	$	3,141,801		$	4,599,104		$	5,719,582		$	(8,811,594	)	$	4,648,893
	Accounts payable	$	—		$	410,017		$	325,080		$	—		$	735,097
	Short-term debt	—			—			37,551			—			37,551
	Other current liabilities	11,920			114,894			196,690			(44,489		)	279,015
	Total current liabilities	11,920			524,911			559,321			(44,489		)	1,051,663
	Intercompany payables, net	1,168,507			738,278			—			(1,906,785		)	—
	Long-term debt	174,149			675,424			598,061			—			1,447,634
	Other noncurrent liabilities	22,416			220,650			141,739			—			384,805
	Total WESCO International stockholders' equity	1,764,809			2,439,841			4,420,479			(6,860,320		)	1,764,809
	Noncontrolling interest	—			—			(18		)	—			(18		)
	Total liabilities and stockholders’ equity	$	3,141,801		$	4,599,104		$	5,719,582		$	(8,811,594	)	$	4,648,893
Condensed Financial Information Statement Of Income [Text Block]	'
		Three Months Ended March 31, 2014
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and
		Inc.			Inc.						Eliminating
											Entries
	Net sales	$	—		$	829,471		$	1,007,453		$	(26,099	)	$	1,810,825
	Cost of goods sold	—			658,584			803,547			(26,099		)	1,436,032
	Selling, general and administrative expenses	—			136,680			128,782			—			265,462
	Depreciation and amortization	—			4,700			11,672			—			16,372
	Results of affiliates’ operations	56,210			40,713			—			(96,923		)	—
	Interest expense, net	6,070			18,761			(4,143		)	—			20,688
	Provision for income taxes	(1,715		)	3,047			19,084			—			20,416
	Net income	51,855			48,412			48,511			(96,923		)	51,855
	Less: Net loss attributable to noncontrolling interest	—			—			(50		)	—			(50		)
	Net income attributable to WESCO International, Inc.	$	51,855		$	48,412		$	48,561		$	(96,923	)	$	51,905
	Comprehensive income:
	Foreign currency translation adjustment	(46,500		)	(46,500		)	(46,500		)	93,000			(46,500		)
	Comprehensive income attributable to WESCO International, Inc.	$	5,355		$	1,912		$	2,061		$	(3,923	)	$	5,405
		Three Months Ended March 31, 2013
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and
		Inc.			Inc.						Eliminating
											Entries
	Net sales	$	—		$	820,235		$	1,018,864		$	(31,040	)	$	1,808,059
	Cost of goods sold	—			650,127			807,892			(31,040		)	1,426,979
	Selling, general and administrative expenses	4			100,517			126,935			—			227,456
	Depreciation and amortization	—			4,103			12,614			—			16,717
	Results of affiliates’ operations	88,453			46,453			—			(134,906		)	—
	Interest expense, net	5,955			18,726			(2,755		)	—			21,926
	Provision for income taxes	(1,600		)	12,242			20,245			—			30,887
	Net income	84,094			80,973			53,933			(134,906		)	84,094
	Less: Net income attributable to noncontrolling interest	—			—			105			—			105
	Net income attributable to WESCO International, Inc.	$	84,094		$	80,973		$	53,828		$	(134,906	)	$	83,989
	Comprehensive income:
	Foreign currency translation adjustment	(23,481		)	(23,481		)	(23,481		)	46,962			(23,481		)
	Comprehensive income attributable to WESCO International, Inc.	$	60,613		$	57,492		$	30,347		$	(87,944	)	$	60,508
Condensed Financial Information Statements Of Cash Flows [Text Block]	'
		Three Months Ended March 31, 2014
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and Eliminating
		Inc.			Inc.						Entries
	Net cash (used) provided by operating activities	$	(4,871	)	$	20,415		$	31,169		$	—		$	46,713
	Investing activities:
	Capital expenditures	—			(3,347		)	(1,665		)	—			(5,012		)
	Acquisition payments	—			—			(91,187		)	—			(91,187		)
	Other				(5,169		)	39			5,169			39
	Net cash used in investing activities	—			(8,516		)	(92,813		)	5,169			(96,160		)
	Financing activities:
	Borrowings	5,168			307,851			115,575			(5,169		)	423,425
	Repayments	—			(307,851		)	(95,592		)				(403,443		)
	Other	(297		)	3,858			(4		)	—			3,557
	Net cash provided by financing activities	4,871			3,858			19,979			(5,169		)	23,539
	Effect of exchange rate changes on cash and cash equivalents	—			—			(1,461		)	—			(1,461		)
	Net change in cash and cash equivalents	—			15,757			(43,126		)	—			(27,369		)
	Cash and cash equivalents at the beginning of year	—			31,695			92,030			—			123,725
	Cash and cash equivalents at the end of period	$	—		$	47,452		$	48,904		$	—		$	96,356
	WESCO INTERNATIONAL, INC. AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
	(unaudited)
		Three Months Ended March 31, 2013
		(In thousands)
		WESCO			WESCO			Non-Guarantor			Consolidating			Consolidated
		International,			Distribution,			Subsidiaries			and Eliminating
		Inc.			Inc.						Entries
	Net cash (used) provided by operating activities	$	(15,594	)	$	38,857		$	57,130		$	—		$	80,393
	Investing activities:
	Capital expenditures	—			(5,300		)	(674		)	—			(5,974		)
	Acquisition payments	—			—			—			—			—
	Other	—			(16,291		)	4,944			16,291			4,944
	Net cash (used) provided by investing activities	—			(21,591		)	4,270			16,291			(1,030		)
	Financing activities:
	Borrowings	16,291			176,922			105,093			(16,291		)	282,015
	Repayments	—			(188,922		)	(144,634		)	—			(333,556		)
	Other	(697		)	3,660			(492		)	—			2,471
	Net cash provided (used) by financing activities	15,594			(8,340		)	(40,033		)	(16,291		)	(49,070		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			399			—			399
	Net change in cash and cash equivalents	—			8,926			21,766			—			30,692
	Cash and cash equivalents at the beginning of year	—			52,275			33,824			—			86,099
	Cash and cash equivalents at the end of period	$	—		$	61,201		$	55,590		$	—		$	116,791

ORGANIZATION_Details

ORGANIZATION (Details)	3 Months Ended
	Mar. 31, 2014
	customers
	countries
	distribution_centers
	branches
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Active customers (in customers)	75,000
Full service branches (in branches)	475
Distribution centers (in distribution centers)	9
Additional countries (in countries)	15

ACCOUNTING_POLICIES_Details

ACCOUNTING POLICIES (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounting Policies [Abstract]	'	'
Fixed Rate Debt, Par Value	$175	$174.10
Fixed Rate Debt, Fair Value Disclosures	$1,027.50	$1,124.30

ACQUISITIONS_ACQUISITIONS_Deta

ACQUISITIONS - ACQUISITIONS (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
	branches
Business Acquisition [Line Items]	'
Fair Value of Assets Acquired	$104,601
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	13,414
Payments to Acquire Businesses, Gross	91,187
Full service branches (in branches)	475
LaPrairie, Inc. [Member]	'
Business Acquisition [Line Items]	'
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	30,000
Finite-lived Intangible Assets Acquired	11,300
Goodwill, Acquired During Period	8,600
Hazmasters, Inc. [Member]	'
Business Acquisition [Line Items]	'
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	80,000
Finite-lived Intangible Assets Acquired	17,700
Goodwill, Acquired During Period	$35,200
Full service branches (in branches)	14

SCHEDULE_OF_SHAREBASED_COMPENS

SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement By Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding [Roll Forward]	'	'
Beginning of Year (in shares)	2,715,651	'
Grants in Period (in shares)	272,213	'
Exercises in Period (in shares)	315,218	'
Forfeitures in Period (in shares)	2,255	'
End of Period (in shares)	2,670,391	'
Exercisable (in shares)	2,142,301	'
Weighted Average Exercise Price, Beginning of Year (in dollars per share)	$45.93	'
Weighted Average Exercise Price, Grants in Period (in dollars per share)	$85.35	'
Weighted Average Exercise Price, Exercises in Period (in dollars per share)	$38.18	'
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)	$67.55	'
Weighted Average Exercise Price, End of Period (in dollars per share)	$50.84	'
Weighted Average Exercise Price, Exercisable (in dollars per share)	$44.31	'
Weighted Average Remaining Contractual Term, Outstanding (in years)	6	'
Weighted Average Remaining Contractual Term, Exercisable (in years)	5.2	'
Aggregate Intrinsic Value, Outstanding	$87,041	'
Aggregate Intrinsic Value, Exercisable	$83,354	'
Stock Appreciation Rights (SARs) [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$30.66	$31.33

SCHEDULE_OF_SHAREBASED_PAYMENT

SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Risk free interest rate	1.50%	0.90%
Expected life (in years)	'5 years	'5 years
WESCO expected volatility	39.00%	50.00%
Stock Appreciation Rights (SARs) [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Granted (in shares)	272,213	246,124
Restricted Stock Units (RSUs) [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Granted (in shares)	62,506	69,393
Performance-based Awards [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Granted (in shares)	44,046	48,058

SUMMARY_OF_RESTRICTED_STOCK_UN

SUMMARY OF RESTRICTED STOCK UNITS (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Unvested (in shares)	198,591	'	184,746
Granted (in shares)	62,506	69,393	'
Vested (in shares)	-47,431	'	'
Forfeited (in shares)	-1,230	'	'
Unvested, Weighted Average Fair Value (in dollars per share)	$73.58	'	$66.08
Granted, Weighted Average Fair Value (in dollars per share)	$85.35	'	'
Vested in Period, Weighted Average Fair Value (in dollars per share)	$60.05	'	'
Forfeited in Period, Weighted Average Fair Value (in dollars per share)	$67.39	'	'

SUMMARY_OF_PERFORMANCEBASED_AW

SUMMARY OF PERFORMANCE-BASED AWARDS (Details) (Performance-based Awards [Member], USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Performance-based Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Unvested (in shares)	134,994	'	92,484
Granted (in shares)	44,046	48,058	'
Vested (in shares)	0	'	'
Forfeited (in shares)	-1,536	'	'
Unvested, Weighted Average Fair Value (in dollars per share)	$80.14	'	$76.98
Granted, Weighted Average Fair Value (in dollars per share)	$86.65	$78.21	'
Vested in Period, Weighted Average Fair Value (in dollars per share)	$0	'	'
Forfeited in Period, Weighted Average Fair Value (in dollars per share)	$76.61	'	'

SCHEDULE_OF_SHAREBASED_PAYMENT1

SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
WESCO expected volatility	39.00%	50.00%
Risk free interest rate	1.50%	0.90%
Performance-based Awards - Peer Group Total Shareholder Return [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Grant date share price	86.65	'
WESCO expected volatility	35.40%	'
Peer group mean volatility	28.70%	'
Risk free interest rate	0.62%	'
Correlation	103.10%	'

STOCKBASED_COMPENSATION_Detail

STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock-based compensation expense	$4.20	$4	'
Total unrecognized compensation cost	30.3	'	'
Compensation cost expected to be recognized over the remainder of 2012	12.5	'	'
Compensation cost expected to be recognized in 2013	11.2	'	'
Compensation cost expected to be recognized in 2014	5.9	'	'
Compensation cost expected to be recognized in 2015	0.7	'	'
Total intrinsic value of awards exercised	18.4	4.1	'
Cash received from exercise of options	0.8	0.1	'
Tax benefit associated with exercise of awards	$7	$0.40	'
Stock Appreciation Rights (SARs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Granted, Weighted Average Fair Value (in dollars per share)	$30.66	$31.33	'
Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Granted, Weighted Average Fair Value (in dollars per share)	$85.35	'	'
Performance-based awards outstanding (in shares)	198,591	'	184,746
Performance-based Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Granted, Weighted Average Fair Value (in dollars per share)	$86.65	$78.21	'
Performance-based awards outstanding (in shares)	134,994	'	92,484
Performance-based Awards - Peer Group Total Shareholder Return [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Performance-based awards outstanding (in shares)	67,497	'	'

SCHEDULE_OF_EARNINGS_PER_SHARE

SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Net income (loss) attributable to WESCO International, Inc.	$51,905	$83,989
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	44,348	44,085
Common shares issuable upon exercise of dilutive stock options (in shares)	1,099	1,099
Common shares issuable from contingently convertible debentures (in shares)	7,926	7,226
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	53,373	52,410
Earnings Per Share, Basic and Diluted [Abstract]	'	'
Basic (in dollars per share)	$1.17	$1.91
Diluted (in dollars per share)	$0.97	$1.60

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock Appreciation Rights (SARs) [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	500,000	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price (in dollars per share)	$79.13	$69.18
Convertible Debt Securities [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Effect of Dilutive Securities on Earnings Per Share (in dollars per share)	$0.17	$0.26
Convertible Debt Securities [Member] | Convertible Senior Debentures Due in 2029 [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$28.87	'
Earnings Per Share Dilution Limit (in shares)	11,948,513	'

EMPLOYEE_BENEFIT_PLANS_Details

EMPLOYEE BENEFIT PLANS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'	'
Defined Benefit Plan, Contributions by Employer	$800,000	'
Schedule of Employee Benefit Plans [Line Items]	'	'
Defined Contribution Plan, Cost Recognized	$4,800,000	$10,300,000
UNITED STATES	'	'
Schedule of Employee Benefit Plans [Line Items]	'	'
Defined Contribution Plan Employer Matching Contribution Percent	50.00%	'
Defined Contribution Plan Maximum Annual Contribution Per Employee Percent	6.00%	'
Minimum [Member] | CANADA	'	'
Schedule of Employee Benefit Plans [Line Items]	'	'
Defined Contribution Plan Maximum Annual Contribution Per Employee Percent	1.00%	'
Maximum [Member] | CANADA	'	'
Schedule of Employee Benefit Plans [Line Items]	'	'
Defined Contribution Plan Maximum Annual Contribution Per Employee Percent	7.00%	'

EMPLOYEE_BENEFIT_PLANS_EMPLOYE

EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'	'
Defined Benefit Plan, Contributions by Employer	$800,000	'
Service cost	900,000	1,033,000
Interest cost	1,156,000	1,160,000
Expected return on plan assets	-1,361,000	-960,000
Net periodic benefit cost	$695,000	$1,233,000

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Damages sought	$50
Damages awarded	36.1
Prejudgment interest awarded	3.9
Post-judgment interest awarded	$7.10

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]	'	'
Effective tax rate	28.20%	26.90%
Federal statutory rate	35.00%	'
Discrete adjustments	'	$0.10

OTHER_FINANCIAL_INFORMATION_De

OTHER FINANCIAL INFORMATION (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2013
In Millions, unless otherwise specified	Convertible Senior Debentures Due in 2029 [Member]	Senior Notes due 2021 [Member]	Parent Company [Member]	Non-Guarantor Subsidiaries [Member]	Non-Guarantor Subsidiaries [Member]	WESCO Distribution, Inc.
Debt Instrument [Line Items]	'	'	'	'	'	'
Change in presentation of other assets and deferred income taxes	'	'	'	'	$24.70	'
Change in presentation of other current assets and other current liabilities	'	'	'	'	7.1	'
Change in Presentation of Interest Expense	'	'	'	6.4	'	6.4
Debt Instrument, Face Amount	344.9	500	'	'	'	'
Change in Presentation of Income Tax Expense	'	'	1.6	18.7	'	17.1
Change in Presentation of Proceeds from Issuance of Intercompany Debt	'	'	'	'	'	$1.60

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Condensed Financial Information [Line Items]	'	'	'	'	'
Cash and cash equivalents	$96,356	$123,725	$116,791	$86,099	$86,099
Trade accounts receivable, net	1,105,297	1,045,054	'	'	'
Inventories, net	811,095	787,324	'	'	'
Other current assets	247,151	249,512	'	'	'
Total current assets	2,259,899	2,205,615	'	'	'
Intercompany receivables, net	0	0	'	'	'
Property, buildings and equipment, net	195,263	198,654	'	'	'
Intangible assets, net	449,180	439,167	'	'	'
Goodwill and other intangibles, net	1,752,112	1,734,391	'	'	'
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0	'	'	'
Other assets	54,615	71,066	'	'	'
Total assets	4,711,069	4,648,893	'	'	'
Accounts payable	781,819	735,097	'	'	'
Short-term debt	42,722	37,551	'	'	'
Other current liabilities	261,631	279,015	'	'	'
Total current liabilities	1,086,172	1,051,663	'	'	'
Intercompany payables, net	0	0	'	'	'
Long-term debt	1,457,586	1,447,634	'	'	'
Other noncurrent liabilities	393,752	384,805	'	'	'
Total stockholders' equity	1,773,627	1,764,809	'	'	'
Stockholders' Equity Attributable to Noncontrolling Interest	68	18	'	'	'
Total liabilities and stockholders' equity	4,711,069	4,648,893	'	'	'
Parent Company [Member]	'	'	'	'	'
Condensed Financial Information [Line Items]	'	'	'	'	'
Cash and cash equivalents	0	0	0	'	0
Trade accounts receivable, net	0	0	'	'	'
Inventories, net	0	0	'	'	'
Other current assets	0	22	'	'	'
Total current assets	0	22	'	'	'
Intercompany receivables, net	0	0	'	'	'
Property, buildings and equipment, net	0	0	'	'	'
Intangible assets, net	0	0	'	'	'
Goodwill and other intangibles, net	0	0	'	'	'
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,147,129	3,137,418	'	'	'
Other assets	4,291	4,361	'	'	'
Total assets	3,151,420	3,141,801	'	'	'
Accounts payable	0	0	'	'	'
Short-term debt	0	0	'	'	'
Other current liabilities	8,159	11,920	'	'	'
Total current liabilities	8,159	11,920	'	'	'
Intercompany payables, net	1,173,676	1,168,507	'	'	'
Long-term debt	174,974	174,149	'	'	'
Other noncurrent liabilities	20,984	22,416	'	'	'
Total stockholders' equity	1,773,627	1,764,809	'	'	'
Stockholders' Equity Attributable to Noncontrolling Interest	0	0	'	'	'
Total liabilities and stockholders' equity	3,151,420	3,141,801	'	'	'
WESCO Distribution, Inc.	'	'	'	'	'
Condensed Financial Information [Line Items]	'	'	'	'	'
Cash and cash equivalents	47,452	31,695	61,201	'	52,275
Trade accounts receivable, net	0	0	'	'	'
Inventories, net	357,462	351,242	'	'	'
Other current assets	161,965	166,540	'	'	'
Total current assets	566,879	549,477	'	'	'
Intercompany receivables, net	0	0	'	'	'
Property, buildings and equipment, net	58,064	59,569	'	'	'
Intangible assets, net	5,238	5,404	'	'	'
Goodwill and other intangibles, net	246,771	246,125	'	'	'
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,717,115	3,722,902	'	'	'
Other assets	15,013	15,627	'	'	'
Total assets	4,609,080	4,599,104	'	'	'
Accounts payable	444,869	410,017	'	'	'
Short-term debt	0	0	'	'	'
Other current liabilities	110,151	114,894	'	'	'
Total current liabilities	555,020	524,911	'	'	'
Intercompany payables, net	707,229	738,278	'	'	'
Long-term debt	675,186	675,424	'	'	'
Other noncurrent liabilities	229,891	220,650	'	'	'
Total stockholders' equity	2,441,754	2,439,841	'	'	'
Stockholders' Equity Attributable to Noncontrolling Interest	0	0	'	'	'
Total liabilities and stockholders' equity	4,609,080	4,599,104	'	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Financial Information [Line Items]	'	'	'	'	'
Cash and cash equivalents	48,904	92,030	55,590	'	33,824
Trade accounts receivable, net	1,105,297	1,045,054	'	'	'
Inventories, net	453,633	436,082	'	'	'
Other current assets	130,543	127,439	'	'	'
Total current assets	1,738,377	1,700,605	'	'	'
Intercompany receivables, net	1,880,905	1,906,785	'	'	'
Property, buildings and equipment, net	137,199	139,085	'	'	'
Intangible assets, net	443,942	433,763	'	'	'
Goodwill and other intangibles, net	1,505,341	1,488,266	'	'	'
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0	'	'	'
Other assets	35,311	51,078	'	'	'
Total assets	5,741,075	5,719,582	'	'	'
Accounts payable	336,950	325,080	'	'	'
Short-term debt	42,722	37,551	'	'	'
Other current liabilities	188,678	196,690	'	'	'
Total current liabilities	568,350	559,321	'	'	'
Intercompany payables, net	0	0	'	'	'
Long-term debt	607,426	598,061	'	'	'
Other noncurrent liabilities	142,877	141,739	'	'	'
Total stockholders' equity	4,422,490	4,420,479	'	'	'
Stockholders' Equity Attributable to Noncontrolling Interest	68	18	'	'	'
Total liabilities and stockholders' equity	5,741,075	5,719,582	'	'	'
Consolidation, Eliminations [Member]	'	'	'	'	'
Condensed Financial Information [Line Items]	'	'	'	'	'
Cash and cash equivalents	0	0	0	'	0
Trade accounts receivable, net	0	0	'	'	'
Inventories, net	0	0	'	'	'
Other current assets	-45,357	-44,489	'	'	'
Total current assets	-45,357	-44,489	'	'	'
Intercompany receivables, net	-1,880,905	-1,906,785	'	'	'
Property, buildings and equipment, net	0	0	'	'	'
Intangible assets, net	0	0	'	'	'
Goodwill and other intangibles, net	0	0	'	'	'
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	-6,864,244	-6,860,320	'	'	'
Other assets	0	0	'	'	'
Total assets	-8,790,506	-8,811,594	'	'	'
Accounts payable	0	0	'	'	'
Short-term debt	0	0	'	'	'
Other current liabilities	-45,357	-44,489	'	'	'
Total current liabilities	-45,357	-44,489	'	'	'
Intercompany payables, net	-1,880,905	-1,906,785	'	'	'
Long-term debt	0	0	'	'	'
Other noncurrent liabilities	0	0	'	'	'
Total stockholders' equity	-6,864,244	-6,860,320	'	'	'
Stockholders' Equity Attributable to Noncontrolling Interest	0	0	'	'	'
Total liabilities and stockholders' equity	($8,790,506)	($8,811,594)	'	'	'

CONDENSED_CONSOLIDATED_INCOME_

CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Information [Line Items]	'	'
Net sales	$1,810,825,000	$1,808,059,000
Cost of goods sold	1,436,032,000	1,426,979,000
Selling, general and administrative expense	265,462,000	227,456,000
Depreciation and amortization	16,372,000	16,717,000
Results of affiliates' operations	0	0
Interest expense, net	20,688,000	21,926,000
Provision for income taxes	20,416,000	30,887,000
Net income (loss)	51,855,000	84,094,000
Less: Net (loss) income attributable to noncontrolling interest	-50,000	105,000
Net income (loss) attributable to WESCO International, Inc.	51,905,000	83,989,000
Comprehensive Income:	'	'
Foreign currency translation adjustment	-46,500,000	-23,481,000
Comprehensive income attributable to WESCO International, Inc.	5,405,000	60,508,000
Parent Company [Member]	'	'
Condensed Financial Information [Line Items]	'	'
Net sales	0	0
Cost of goods sold	0	0
Selling, general and administrative expense	0	4,000
Depreciation and amortization	0	0
Results of affiliates' operations	56,210,000	88,453,000
Interest expense, net	6,070,000	5,955,000
Provision for income taxes	-1,715,000	-1,600,000
Net income (loss)	51,855,000	84,094,000
Less: Net (loss) income attributable to noncontrolling interest	0	0
Net income (loss) attributable to WESCO International, Inc.	51,855,000	84,094,000
Comprehensive Income:	'	'
Foreign currency translation adjustment	-46,500,000	-23,481,000
Comprehensive income attributable to WESCO International, Inc.	5,355,000	60,613,000
Change in Presentation of Income Tax Expense	'	1,600,000
WESCO Distribution, Inc.	'	'
Condensed Financial Information [Line Items]	'	'
Net sales	829,471,000	820,235,000
Cost of goods sold	658,584,000	650,127,000
Selling, general and administrative expense	136,680,000	100,517,000
Depreciation and amortization	4,700,000	4,103,000
Results of affiliates' operations	40,713,000	46,453,000
Interest expense, net	18,761,000	18,726,000
Provision for income taxes	3,047,000	12,242,000
Net income (loss)	48,412,000	80,973,000
Less: Net (loss) income attributable to noncontrolling interest	0	0
Net income (loss) attributable to WESCO International, Inc.	48,412,000	80,973,000
Comprehensive Income:	'	'
Foreign currency translation adjustment	-46,500,000	-23,481,000
Comprehensive income attributable to WESCO International, Inc.	1,912,000	57,492,000
Change in Presentation of Interest Expense	'	6,400,000
Change in Presentation of Income Tax Expense	'	17,100,000
Non-Guarantor Subsidiaries [Member]	'	'
Condensed Financial Information [Line Items]	'	'
Net sales	1,007,453,000	1,018,864,000
Cost of goods sold	803,547,000	807,892,000
Selling, general and administrative expense	128,782,000	126,935,000
Depreciation and amortization	11,672,000	12,614,000
Results of affiliates' operations	0	0
Interest expense, net	-4,143,000	-2,755,000
Provision for income taxes	19,084,000	20,245,000
Net income (loss)	48,511,000	53,933,000
Less: Net (loss) income attributable to noncontrolling interest	-50,000	105,000
Net income (loss) attributable to WESCO International, Inc.	48,561,000	53,828,000
Comprehensive Income:	'	'
Foreign currency translation adjustment	-46,500,000	-23,481,000
Comprehensive income attributable to WESCO International, Inc.	2,061,000	30,347,000
Change in Presentation of Interest Expense	'	6,400,000
Change in Presentation of Income Tax Expense	'	18,700,000
Consolidation, Eliminations [Member]	'	'
Condensed Financial Information [Line Items]	'	'
Net sales	-26,099,000	-31,040,000
Cost of goods sold	-26,099,000	-31,040,000
Selling, general and administrative expense	0	0
Depreciation and amortization	0	0
Results of affiliates' operations	-96,923,000	-134,906,000
Interest expense, net	0	0
Provision for income taxes	0	0
Net income (loss)	-96,923,000	-134,906,000
Less: Net (loss) income attributable to noncontrolling interest	0	0
Net income (loss) attributable to WESCO International, Inc.	-96,923,000	-134,906,000
Comprehensive Income:	'	'
Foreign currency translation adjustment	93,000,000	46,962,000
Comprehensive income attributable to WESCO International, Inc.	($3,923,000)	($87,944,000)

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Information [Line Items]	'	'
Net cash (used) provided by operating activities	$46,713,000	$80,393,000
Investing Activities:	'	'
Capital expenditures	-5,012,000	-5,974,000
Acquisition payments	-91,187,000	0
Other	39,000	4,944,000
Net cash used in investing activities	-96,160,000	-1,030,000
Financing Activities:	'	'
Borrowings	423,425,000	282,015,000
Repayments	-403,443,000	-333,556,000
Condensed Proceeds from (Payments for) Other Financing Activities	3,557,000	2,471,000
Net cash used in financing activities	23,539,000	-49,070,000
Effect of exchange rate changes on cash and cash equivalents	-1,461,000	399,000
Net change in cash and cash equivalents	-27,369,000	30,692,000
Cash and cash equivalents at the beginning of period	123,725,000	86,099,000
Cash and cash equivalents at the end of period	96,356,000	116,791,000
Parent Company [Member]	'	'
Condensed Financial Information [Line Items]	'	'
Net cash (used) provided by operating activities	-4,871,000	-15,594,000
Investing Activities:	'	'
Capital expenditures	0	0
Acquisition payments	0	0
Other	'	0
Net cash used in investing activities	0	0
Financing Activities:	'	'
Borrowings	5,168,000	16,291,000
Repayments	0	0
Condensed Proceeds from (Payments for) Other Financing Activities	-297,000	-697,000
Net cash used in financing activities	4,871,000	15,594,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of period	0	'
Cash and cash equivalents at the end of period	0	0
WESCO Distribution, Inc.	'	'
Condensed Financial Information [Line Items]	'	'
Net cash (used) provided by operating activities	20,415,000	38,857,000
Investing Activities:	'	'
Capital expenditures	-3,347,000	-5,300,000
Acquisition payments	0	0
Other	-5,169,000	-16,291,000
Net cash used in investing activities	-8,516,000	-21,591,000
Financing Activities:	'	'
Borrowings	307,851,000	176,922,000
Repayments	-307,851,000	-188,922,000
Condensed Proceeds from (Payments for) Other Financing Activities	3,858,000	3,660,000
Net cash used in financing activities	3,858,000	-8,340,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	15,757,000	8,926,000
Cash and cash equivalents at the beginning of period	31,695,000	'
Cash and cash equivalents at the end of period	47,452,000	61,201,000
Change in Presentation of Proceeds from Issuance of Intercompany Debt	'	1,600,000
Non-Guarantor Subsidiaries [Member]	'	'
Condensed Financial Information [Line Items]	'	'
Net cash (used) provided by operating activities	31,169,000	57,130,000
Investing Activities:	'	'
Capital expenditures	-1,665,000	-674,000
Acquisition payments	-91,187,000	0
Other	39,000	4,944,000
Net cash used in investing activities	-92,813,000	4,270,000
Financing Activities:	'	'
Borrowings	115,575,000	105,093,000
Repayments	-95,592,000	-144,634,000
Condensed Proceeds from (Payments for) Other Financing Activities	-4,000	-492,000
Net cash used in financing activities	19,979,000	-40,033,000
Effect of exchange rate changes on cash and cash equivalents	-1,461,000	399,000
Net change in cash and cash equivalents	-43,126,000	21,766,000
Cash and cash equivalents at the beginning of period	92,030,000	'
Cash and cash equivalents at the end of period	48,904,000	55,590,000
Consolidation, Eliminations [Member]	'	'
Condensed Financial Information [Line Items]	'	'
Net cash (used) provided by operating activities	0	0
Investing Activities:	'	'
Capital expenditures	0	0
Acquisition payments	0	0
Other	5,169,000	16,291,000
Net cash used in investing activities	5,169,000	16,291,000
Financing Activities:	'	'
Borrowings	-5,169,000	-16,291,000
Repayments	'	0
Condensed Proceeds from (Payments for) Other Financing Activities	0	0
Net cash used in financing activities	-5,169,000	-16,291,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of period	0	'
Cash and cash equivalents at the end of period	$0	$0