WESCO International (WCC) 10-Q 31 Jul 15 2015 Q2 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION Document - shares	6 Months Ended
	Jun. 30, 2015	Jul. 30, 2015
Entity [Abstract]
Entity Registrant Name	WESCO INTERNATIONAL INC.
Entity Central Index Key	929,008
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		43,547,989

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Depreciation, Depletion and Amortization, Nonproduction	$ 16,139	$ 32,060
Other Accrued Liabilities, Current	151,068	151,068	$ 181,672
Current Assets:
Cash and cash equivalents	174,307	174,307	128,319
Allowance for Doubtful Accounts Receivable, Current	22,081	22,081	21,084
Trade accounts receivable, net of allowance for doubtful accounts of $23,069 and $19,309 in 2014 and 2013, respectively	1,124,893	1,124,893	1,117,420
Accounts and Other Receivables, Net, Current	60,820	60,820	138,745
Inventories, net	847,045	847,045	819,502
Prepaid expenses and other current assets	160,985	160,985	146,352
Total current assets	2,368,050	2,368,050	2,350,338
Property, buildings and equipment, net of accumulated depreciation of $229,041 and $213,758 in 2014 and 2013, respectively	180,049	180,049	182,725
Intangible assets, net	415,327	415,327	429,840
Goodwill	1,713,118	1,713,118	1,735,440
Other assets	49,823	49,823	56,094
Total assets	4,726,367	4,726,367	4,754,437
Current Liabilities:
Accounts payable	770,605	770,605	765,135
Accrued payroll and benefit costs	40,882	40,882	67,935
Short-term debt	46,924	46,924	46,787
Current portion of long-term debt	2,232	2,232	2,343
Total current liabilities	1,011,711	1,011,711	1,063,872
Long-term Debt, Excluding Current Maturities	1,436,802	1,436,802	1,366,430
Other noncurrent liabilities	51,733	51,733	49,227
Deferred income taxes	360,178	360,178	346,743
Total liabilities	$ 2,860,424	$ 2,860,424	$ 2,826,272
Commitments and Contingencies
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0	$ 0
Additional capital	1,110,716	1,110,716	1,102,369
Retained earnings	1,742,549	1,742,549	1,643,914
Treasury stock, at cost; 18,247,467 and 18,179,275 shares in 2014 and 2013, respectively	(695,959)	(695,959)	(616,366)
Accumulated other comprehensive income	(290,164)	(290,164)	(201,892)
Total WESCO International stockholders' equity	1,865,943	1,865,943	1,928,165
Noncontrolling interest	(1,828)	(1,828)	(487)
Total stockholders' equity	1,867,771	1,867,771	1,928,652
Total liabilities and stockholders' equity	4,726,367	4,726,367	4,754,437
Common Stock [Member]
Stockholders' Equity:
Common stock	586	586	584
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 43	$ 43	$ 43

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 22,081,000	$ 21,084,000
Accumulated depreciation	237,656,000	229,196,000
Finite-Lived Intangible Assets, Accumulated Amortization	125,899	110,828
Debt discount	$ 167,029,000	$ 170,367,000
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)	19,345,283	18,250,178
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)	58,586,095	58,400,736
Common stock, shares outstanding (in shares)	43,580,243	44,489,989
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 INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net sales	$ 1,916,718	$ 2,005,165	$ 3,733,048	$ 3,815,991
Cost of goods sold	1,535,084	1,593,437	2,983,723	3,029,470
Selling, general and administrative expense	275,242	278,709	539,826	544,171
Depreciation and amortization	16,139	17,186	32,060	33,558
Income from operations	90,253	115,833	177,439	208,792
Interest expense, net	18,613	20,337	39,508	41,025
Income before income taxes	71,640	95,496	137,931	167,767
Provision for income taxes	21,001	26,709	40,500	47,125
Net income	50,639	68,787	97,431	120,642
Net (loss) income attributable to noncontrolling interest	(1,102)	(15)	(1,341)	(65)
Net income attributable to WESCO International, Inc.	51,741	68,802	98,772	120,707
Comprehensive Income:
Foreign currency translation adjustment	25,542	43,023	(88,257)	(3,477)
Comprehensive income attributable to WESCO International, Inc.	$ 77,283	$ 111,825	$ 10,515	$ 117,230
Earnings per share attributable to WESCO International, Inc.
Basic (in dollars per share)	$ 1.18	$ 1.55	$ 2.23	$ 2.72
Diluted (in dollars per share)	$ 1	$ 1.29	$ 1.90	$ 2.26

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities:
Net income	$ 97,431	$ 120,642
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,060	33,558
Deferred income taxes	16,717	13,719
Other operating activities, net	12,708	5,882
Changes in assets and liabilities
Increase (Decrease) in Accounts Receivable	3,788	121,797
Increase (Decrease) in Accounts and Other Receivables	(76,571)	(12,672)
Inventories, net	(26,742)	(44,910)
Prepaid expenses and other current assets	400	(30,840)
Accounts payable	846	47,082
Accrued payroll and benefit costs	(26,513)	(5,710)
Other current and noncurrent liabilities	(47,049)	20,544
Net cash provided by operating activities	132,641	50,842
Investing Activities:
Capital expenditures	(12,624)	(11,785)
Acquisition payments, net of cash acquired	(68,502)	(133,318)
Other investing activities	1,425	27
Net cash used in investing activities	(79,701)	(145,076)
Financing Activities:
Proceeds from issuance of short-term debt	60,420	33,085
Repayments of short-term debt	(58,153)	(25,983)
Proceeds from issuance of long-term debt	794,176	606,836
Repayments of Long-term Debt	(721,307)	(537,048)
Other financing activities, net	3,580	4,861
Net cash used in financing activities	(2,033)	75,310
Payments for Repurchase of Common Stock	(80,749)	(6,441)
Effect of exchange rate on cash and cash equivalents	(4,919)	(3,158)
Net change in cash and cash equivalents	45,988	(22,082)
Cash and cash equivalents at the beginning of period	128,319	123,725
Cash and cash equivalents at the end of period	$ 174,307	$ 101,643

ORGANIZATION

ORGANIZATION	6 Months Ended
	Jun. 30, 2015
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. WESCO serves over 75,000 active customers globally, through approximately 485 full service branches and nine distribution centers located primarily in the United States, Canada and Mexico, with operations in 16 additional countries.

ACCOUNTING POLICIES

ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
ACCOUNTING POLICIES	ACCOUNTING POLICIES Basis of Presentation The accompanying 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 information should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in WESCO’s 2014 Annual Report on Form 10-K as filed with the SEC on February 24, 2015. The Condensed Consolidated Balance Sheet at December 31, 2014 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America. The unaudited Condensed Consolidated Balance Sheet as of June 30, 2015 , the unaudited Condensed Consolidated Statements of Income and Comprehensive Income for the three and six months ended June 30, 2015 and 2014 , respectively, and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2015 and 2014 , 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 presented herein. All adjustments reflected in the unaudited condensed consolidated financial information are of a normal recurring nature unless indicated. The results for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. The Condensed Consolidated Balance Sheet at December 31, 2014 and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2014 include certain reclassifications to previously reported amounts to conform to the current period presentation. Fair Value of Financial Instruments The Company measures the fair value of financial assets and liabilities in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (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 that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to measurements involving significant unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: • Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date. • 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 June 30, 2015 , the carrying value of WESCO’s 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $179.5 million and the fair value was approximately $839.4 million . At December 31, 2014 , the carrying value of WESCO’s 2029 Debentures was $177.6 million and the fair value was approximately $936.1 million . The reported carrying amounts of WESCO’s other debt instruments approximate their fair values. The Company uses a market approach to fair value all of its debt instruments, utilizing quoted prices in active markets, interest rates and other relevant information generated by market transactions involving similar instruments. Therefore, all of the Company's debt instruments are classified as Level 2 within the valuation hierarchy. For all of the Company's remaining financial instruments, consisting of cash and cash equivalents, accounts receivable, accounts payable and other accrued liabilities, carrying values are considered to approximate fair value due to the short maturity of these instruments. New Accounting Pronouncements In May 2014, the FASB and the International Accounting Standards Board issued a converged final standard on the recognition of revenue from contracts with customers. This updated guidance provides a framework for addressing revenue recognition issues and replaces almost all existing revenue recognition guidance in current U.S. generally accepted accounting principles. The core principle of the new standard is for companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard will also result in enhanced disclosures about revenue, provide guidance for transactions that were not previously addressed comprehensively, and improve guidance for multiple-element arrangements. The original standard was effective for fiscal years beginning after December 15, 2016; however, in July 2015, the FASB approved a one-year deferral of this standard. Accordingly, the standard is effective for fiscal years beginning after December 15, 2017. Early adoption is permitted to the original effective date of December 15, 2016 (including interim reporting periods within those periods). Management is currently evaluating the future impact of this guidance on WESCO's financial position, results of operations and cash flows. In June 2014, the FASB issued Accounting Standards Update ("ASU") 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period . The amendments in this ASU require a reporting entity to treat a performance target that affects vesting and could be achieved after the requisite service period as a performance condition. A reporting entity should apply FASB ASC Topic 718, Compensation — Stock Compensation , to awards with performance conditions that affect vesting. For all entities, ASU 2014-12 is effective for annual periods and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. This ASU may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption and to all new or modified awards thereafter. The adoption of this guidance is not expected to have an impact on WESCO's consolidated financial statements and notes thereto. In September 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern. This ASU describes how an entity should assess its ability to meet obligations and sets disclosure requirements for how this information should be disclosed in the financial statements. The standard provides accounting guidance that will be used with existing auditing standards. The amendments in this ASU are effective for the annual period ending after December 15, 2016 and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have an impact on WESCO's consolidated financial statements and notes thereto. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs . To simplify the presentation of debt issuance costs, the amendments in this ASU require that debt issuance costs related to a recognized liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within fiscal years beginning after December 15, 2016. Early adoption is permitted for financial statements that have not been previously issued. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. These disclosures include the nature of and reason for the change in accounting principle, the transition method, a description of the prior-period information that has been retrospectively adjusted, and the effect of the change on the financial statement line items (that is, debt issuance cost asset and the debt liability). Management is currently evaluating the future impact of this guidance on WESCO's financial position, results of operations and cash flows.

ACQUISITIONS

ACQUISITIONS	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS The following table sets forth the consideration paid for acquisitions: Six Months Ended (In thousands of dollars) June 30, June 30, Fair value of assets acquired $ 89,786 $ 150,966 Fair value of liabilities assumed 21,284 17,648 Cash paid for acquisitions, net of cash acquired $ 68,502 $ 133,318 The fair values of assets acquired and liabilities assumed during the six months ended June 30, 2015 , which were primarily for the acquisition of Hill Country Electric Supply, LP ("Hill Country"), were based upon preliminary calculations and valuations. WESCO's estimates and assumptions for its preliminary purchase price allocation are subject to change as it obtains additional information for its estimates during the respective measurement periods (up to one year from the respective acquisition date). 2015 Acquisition of Hill Country Electric Supply, LP On May 1, 2015 , WESCO Distribution, Inc. completed the acquisition of Hill Country, an electrical distributor focused on the commercial construction market from nine locations in Central and South Texas with approximately $140 million in annual sales. WESCO funded the purchase price paid at closing with borrowings under the revolving credit facility (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 $21.1 million and goodwill of $15.8 million . The intangible assets include customer relationships of $13.1 million amortized over 11 years, non-compete agreements of $0.2 million amortized over 5 years, and trademarks of $7.8 million amortized over 12 years. No residual value is estimated for the intangible assets being amortized. Management believes that the majority of goodwill is deductible for tax purposes. 2014 Acquisitions of LaPrairie, Inc., Hazmasters, Inc. and Hi-Line Utility Supply. On February 1, 2014 , WESCO Distribution, Inc., through its wholly-owned Canadian subsidiary, completed the acquisition of LaPrairie, Inc. ("LaPrairie"), a wholesale distributor of electrical products with approximately $30 million in annual sales servicing the transmission, distribution, and substation needs of utilities and utility contractors 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 fair value of intangibles was estimated by management and the allocation resulted in intangible assets of $11.0 million and goodwill of $8.9 million . The majority of goodwill is 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 with approximately $80 million in annual sales servicing customers in the industrial, construction, commercial, institution, and government markets 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 fair value of intangibles was estimated by management and the allocation resulted in intangible assets of $28.1 million and goodwill of $29.5 million , which is not deductible for tax purposes. On June 11, 2014 , WESCO Distribution, Inc., completed the acquisition of Hi-Line Utility Supply ("Hi-Line"), a provider of utility MRO and safety products, as well as rubber goods testing and certification services, with approximately $30 million in annual sales from locations in Chicago, Illinois and Millbury, Massachusetts. 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 fair value of intangibles was estimated by management and the allocation resulted in intangible assets of $14.2 million and goodwill of $24.0 million . The majority of goodwill is deductible for tax purposes. For all acquisitions made in the first half of 2014, the intangible assets include customer relationships of $38.9 million amortized over 2 to 12 years, supplier relationships of $3.2 million amortized over 10 years, trademarks of $10.9 million , and other intangibles of $0.3 million . Certain trademarks have been assigned an indefinite life while others are amortized over 5 and 10 years. No residual value is estimated for the intangible assets being amortized.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	6 Months Ended
	Jun. 30, 2015
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-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-settled stock appreciation rights and performance-based awards with market conditions is determined using the Black-Scholes and Monte Carlo simulation models, respectively. The fair value of restricted stock units and performance-based awards with performance conditions 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 months ended June 30, 2015 and 2014 , WESCO granted the following stock-settled appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values: Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, Stock-settled appreciation rights granted — 2,295 394,182 274,508 Weighted-average fair value $ — $ 27.71 $ 21.68 $ 30.64 Restricted stock units granted — — 78,292 62,506 Weighted-average fair value $ — $ — $ 69.54 $ 85.35 Performance-based awards granted — — 59,661 44,046 Weighted-average fair value $ — $ — $ 67.81 $ 86.65 The fair value of stock-settled appreciation rights was estimated using the following weighted-average assumptions: Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, Risk free interest rate — % 1.6 % 1.6 % 1.5 % Expected life (in years) 0 5 5 5 Expected volatility — % 34 % 32 % 39 % The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve rates as of the grant date. The expected life is based on historical exercise experience and the expected volatility is based on the volatility of the Company's daily stock prices over a five-year period preceding the grant date. The following table sets forth a summary of stock-settled stock appreciation rights and related information for the six months ended June 30, 2015 : Awards Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In years) Aggregate Intrinsic Value (In thousands) Outstanding at December 31, 2014 2,480,745 $ 50.91 Granted 394,182 69.54 Exercised (227,441 ) 35.87 Forfeited (13,643 ) 79.35 Outstanding at June 30, 2015 2,633,843 54.85 5.7 $ 41,895.0 Exercisable at June 30, 2015 1,996,529 $ 48.71 4.6 $ 41,891.2 The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2015 : Awards Weighted- Average Fair Value Unvested at December 31, 2014 185,457 $ 73.87 Granted 78,292 69.54 Vested (66,902 ) 65.32 Forfeited (4,179 ) 77.75 Unvested at June 30, 2015 192,668 $ 74.99 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 six months ended June 30, 2015 : Awards Weighted- Average Fair Value Unvested at December 31, 2014 130,004 $ 80.21 Granted 59,661 67.81 Vested (38,869 ) 72.25 Forfeited (10,800 ) 85.87 Unvested at June 30, 2015 139,996 $ 76.70 The fair value of the performance shares granted during the six months ended June 30, 2015 was estimated using the following weighted-average assumptions: Weighted-Average Assumptions Grant date share price $ 69.54 WESCO expected volatility 26.9 % Peer group median volatility 23.2 % Risk-free interest rate 1.05 % Correlation of peer company returns 95.8 % The unvested performance-based awards in the table above include 69,998 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 accounted for as awards with market conditions; compensation cost is recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest. Vesting of the remaining 69,998 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 accounted for as awards with performance conditions; 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 $4.0 million and $4.3 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended June 30, 2015 and 2014 , respectively. WESCO recognized $7.8 million and $8.5 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the six months ended June 30, 2015 and 2014 , respectively. As of June 30, 2015 , there was $25.8 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $7.6 million is expected to be recognized over the remainder of 2015 , $11.4 million in 2016 , $6.1 million in 2017 and $0.7 million in 2018 . During the six months ended June 30, 2015 and 2014 , the total intrinsic value of all awards exercised and vested was $15.3 million and $22.9 million , respectively. The total amount of cash received from the exercise of options was $0.8 million for the six months ended June 30, 2014 . The gross deferred tax benefit associated with the exercise of awards for the six months ended June 30, 2015 and 2014 totaled $5.5 million and $8.7 million , respectively, and was recorded as an increase to additional capital.

EARNINGS PER SHARE

EARNINGS PER SHARE	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings per share are computed by dividing net income by the weighted-average number of 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 dilutive equity awards and contingently convertible debt. The following tables set forth the details of basic and diluted earnings per share: Three Months Ended June 30, (In thousands of dollars, except per share data) 2015 2014 Net income attributable to WESCO International, Inc. $ 51,741 $ 68,802 Weighted-average common shares outstanding used in computing basic earnings per share 43,997 44,449 Common shares issuable upon exercise of dilutive equity awards 767 1,031 Common shares issuable from contingently convertible debentures (see below for basis of calculation) 7,138 7,996 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 51,902 53,476 Earnings per share attributable to WESCO International, Inc. Basic $ 1.18 $ 1.55 Diluted $ 1.00 $ 1.29 Six Months Ended June 30, (In thousands of dollars, except per share data) 2015 2014 Net income attributable to WESCO International, Inc. $ 98,772 $ 120,707 Weighted-average common shares outstanding used in computing basic earnings per share 44,200 44,399 Common shares issuable upon exercise of dilutive equity awards 795 1,061 Common shares issuable from contingently convertible debentures (see below for basis of calculation) 7,055 7,962 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 52,050 53,422 Earnings per share attributable to WESCO International, Inc. Basic $ 2.23 $ 2.72 Diluted $ 1.90 $ 2.26 For the three and six months ended June 30, 2015 , the computation of diluted earnings per share attributable to WESCO International, Inc. excluded approximately 0.9 million stock-settled stock appreciation rights at a weighted-average exercise price of $74.93 per share. For the three and six months ended June 30, 2014 , the computation of diluted earnings per share attributable to WESCO International, Inc. excluded approximately 0.5 million stock-settled stock appreciation rights at weighted average exercise prices of $84.71 per share and $79.37 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 11,947,671 shares for the 2029 Debentures. For the three and six months June 30, 2015 , the effect of the 2029 Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.16 and $0.30 , respectively. For the three and six months June 30, 2014 , the effect of the 2029 Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.22 and $0.40 , respectively. In December 2014, the Company's Board of Directors authorized the repurchase of up to $300 million of the Company's common stock through December 31, 2017. During the six months ended June 30, 2015 , the Company entered into accelerated stock repurchase agreements (the "ASR Transactions") with certain financial institutions to purchase shares of its common stock. In exchange for up-front cash payments totaling $75.0 million , the Company received 1,050,927 shares. The total number of shares ultimately delivered under the ASR Transactions was determined by the average of the volume-weighted average prices of the Company's common stock for each exchange business day during the respective settlement valuation periods. WESCO funded the repurchases with borrowings under the Revolving Credit Facility. For purposes of computing earnings per share, shares received under the ASR Transactions were reflected as a reduction to common shares outstanding on the respective delivery dates.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	6 Months Ended
	Jun. 30, 2015
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 3% to 5% of the participant’s eligible compensation based on years of continuous service. In addition, for U.S. participants, employer contributions may be made at the discretion of the Board of Directors. For the six months ended June 30, 2015 and 2014 , WESCO incurred charges of $14.3 million and $15.0 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: Three Months Ended Six Months Ended June 30, June 30, (In thousands of dollars) 2015 2014 2015 2014 Service cost $ 1,158 $ 900 $ 2,328 $ 1,800 Interest cost 1,031 1,158 2,073 2,314 Expected return on plan assets (1,351 ) (1,362 ) (2,718 ) (2,723 ) Recognized actuarial gain (4 ) (14 ) (8 ) (28 ) Net periodic benefit cost $ 834 $ 682 $ 1,675 $ 1,363 During the three and six months ended June 30, 2015 , the Company made aggregate cash contributions of $0.5 million and $1.0 million , respectively, to its defined benefit plans.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES As initially reported in its 2008 Annual Report on Form 10-K, WESCO was a defendant in a lawsuit filed in a state court in Indiana in which a customer, ArcelorMittal Indiana Harbor, Inc. (“AIH”), alleged 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 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. The Company disputed this outcome and filed a post-trial motion challenging the verdict, alleging various errors that occurred during trial. 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 appealed the judgment. On November 10, 2014, the Indiana Court of Appeals reversed the prejudgment interest award, but otherwise affirmed the underlying judgment. A petition for further review of the case was filed with the Indiana Supreme Court. On April 15, 2015, the Company, AIH and the parties’ respective insurance carriers agreed to settle the case. As part of the settlement, the Company's insurers paid $35.8 million to AIH on April 30, 2015 in full and final satisfaction of the judgment, including any prejudgment and post-judgment interest, and AIH agreed to release all claims against the Company and its insurers. The parties also agreed to a dismissal of the pending appeal to the Indiana Supreme Court. To account for the settlement, the Company reversed the previously recorded liability and corresponding receivable of $36.1 million , plus $10.2 million of interest that had accrued in connection with this matter. Accordingly, the settlement of this matter had no net effect on the Company's financial condition or results of operations. WESCO is subject to the laws and regulations of states and other jurisdictions concerning the identification, reporting and escheatment (the transfer of property to the state) of unclaimed or abandoned funds, and is subject to audit and examination for compliance with these requirements. WESCO Distribution, Inc. is currently undergoing a compliance audit in the State of Delaware concerning the identification, reporting and escheatment of unclaimed or abandoned property. A third party auditor is conducting the audit on behalf of the State, and the Company has been working with an outside consultant during the audit process and in discussions with the auditors. The Company is defending the audit, the outcome of which cannot be predicted with certainty at this time. After the third party auditor completes its field work, it is expected to issue preliminary findings for review by the Company and the State, and thereafter the auditor is expected to issue a final report of examination. If the Company and State do not reach resolution after further discussion, the State issues a demand for payment, which the Company may either agree to pay or appeal, in full or in part. The Company has recorded a liability for unclaimed property based on the facts currently known to the Company. In October 2014, WESCO was notified that the New York County District Attorney’s Office is conducting a criminal investigation involving minority and disadvantaged business contracting practices in the construction industry in New York City and that various contractors, minority and disadvantaged business firms, and their material suppliers, including the Company, are a part of this investigation. The Company has commenced an internal review of this matter and intends to cooperate with the government investigation. The Company cannot predict the outcome or impact of the matter at this time, but could be subject to fines, penalties or other adverse consequences. Based on the facts currently known to the Company, it cannot reasonably estimate a range of exposure to potential liability at this time.

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The effective tax rate for the three and six months ended June 30, 2015 was 29.3% and 29.4% , respectively. The effective tax rate for the three and six months ended June 30, 2014 was 28.0% and 28.1% , respectively. WESCO’s effective tax rate is lower than the federal statutory rate of 35% in both periods 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. There have been no material adjustments to liabilities relating to uncertain tax positions since the last annual disclosure for the year ended December 31, 2014 .

OTHER FINANCIAL INFORMATION

OTHER FINANCIAL INFORMATION	6 Months Ended
	Jun. 30, 2015
Condensed Financial Information [Abstract]
OTHER FINANCIAL INFORMATION	WESCO International, Inc. has outstanding $344.9 million in aggregate principal amount of 2029 Debentures. The 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution, Inc., a 100% owned subsidiary of WESCO International, Inc., on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution, Inc. WESCO Distribution, Inc. has outstanding $500 million in aggregate principal amount of 5.375% Senior Notes due 2021 (the "2021 Notes"). The 2021 Notes are unsecured senior obligations of WESCO Distribution, Inc. and are fully and unconditionally guaranteed on a senior unsecured basis by WESCO International, Inc. Condensed consolidating financial information for WESCO International, Inc., WESCO Distribution, Inc. and the non-guarantor subsidiaries is presented in the following tables. Condensed Consolidating Balance Sheet June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Cash and cash equivalents $ — $ 43,725 $ 130,582 $ — $ 174,307 Trade accounts receivable, net — — 1,124,893 — 1,124,893 Inventories, net — 399,924 447,121 — 847,045 Other current assets 3 102,257 125,995 (6,450 ) 221,805 Total current assets 3 545,906 1,828,591 (6,450 ) 2,368,050 Intercompany receivables, net — — 1,838,753 (1,838,753 ) — Property, buildings and equipment, net — 60,246 119,803 — 180,049 Intangible assets, net — 4,193 411,134 — 415,327 Goodwill — 254,899 1,458,219 — 1,713,118 Investments in affiliates 3,322,835 3,823,109 — (7,145,944 ) — Other noncurrent assets 3,943 11,418 34,462 — 49,823 Total assets $ 3,326,781 $ 4,699,771 $ 5,690,962 $ (8,991,147 ) $ 4,726,367 Accounts payable $ — $ 454,136 $ 316,469 $ — $ 770,605 Short-term debt — — 46,924 — 46,924 Other current liabilities 12,463 58,246 129,923 (6,450 ) 194,182 Total current liabilities 12,463 512,382 493,316 (6,450 ) 1,011,711 Intercompany payables, net 1,245,134 593,619 — (1,838,753 ) — Long-term debt, net 179,526 753,014 504,262 — 1,436,802 Other noncurrent liabilities 21,887 251,872 138,152 — 411,911 Total WESCO International, Inc. stockholders' equity 1,867,771 2,588,884 4,557,060 (7,145,944 ) 1,867,771 Noncontrolling interest — — (1,828 ) — (1,828 ) Total liabilities and stockholders’ equity $ 3,326,781 $ 4,699,771 $ 5,690,962 $ (8,991,147 ) $ 4,726,367 Condensed Consolidating Balance Sheet December 31, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Cash and cash equivalents $ — $ 32,508 $ 95,811 $ — $ 128,319 Trade accounts receivable, net — — 1,117,420 — 1,117,420 Inventories, net — 373,938 445,564 — 819,502 Other current assets 12 144,282 147,268 (6,465 ) 285,097 Total current assets 12 550,728 1,806,063 (6,465 ) 2,350,338 Intercompany receivables, net — — 1,806,215 (1,806,215 ) — Property, buildings and equipment, net — 56,735 125,990 — 182,725 Intangible assets, net — 4,733 425,107 — 429,840 Goodwill — 246,771 1,488,669 — 1,735,440 Investments in affiliates 3,304,914 3,828,727 — (7,133,641 ) — Other noncurrent assets 4,083 12,844 39,167 — 56,094 Total assets $ 3,309,009 $ 4,700,538 $ 5,691,211 $ (8,946,321 ) $ 4,754,437 Accounts payable $ — $ 445,680 $ 319,455 $ — $ 765,135 Short-term debt — — 46,787 — 46,787 Other current liabilities 12,465 113,746 132,204 (6,465 ) 251,950 Total current liabilities 12,465 559,426 498,446 (6,465 ) 1,063,872 Intercompany payables, net 1,168,366 637,849 — (1,806,215 ) — Long-term debt, net 177,638 683,407 505,385 — 1,366,430 Other noncurrent liabilities 21,888 232,544 141,538 — 395,970 Total WESCO International, Inc. stockholders' equity 1,928,652 2,587,312 4,546,329 (7,133,641 ) 1,928,652 Noncontrolling interest — — (487 ) — (487 ) Total liabilities and stockholders’ equity $ 3,309,009 $ 4,700,538 $ 5,691,211 $ (8,946,321 ) $ 4,754,437 Condensed Consolidating Statement of Income and Comprehensive Income Three Months Ended June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 884,769 $ 1,062,255 $ (30,306 ) $ 1,916,718 Cost of goods sold (excluding depreciation and amortization) — 714,088 851,302 (30,306 ) 1,535,084 Selling, general and administrative expenses 9 147,911 127,322 — 275,242 Depreciation and amortization — 4,940 11,199 — 16,139 Results of affiliates’ operations 55,029 46,387 — (101,416 ) — Interest expense, net 6,200 17,240 (4,827 ) — 18,613 Provision for income taxes (1,820 ) 168 22,653 — 21,001 Net income 50,640 46,809 54,606 (101,416 ) 50,639 Net loss attributable to noncontrolling interest — — (1,102 ) — (1,102 ) Net income attributable to WESCO International, Inc. $ 50,640 $ 46,809 $ 55,708 $ (101,416 ) $ 51,741 Other comprehensive income: Foreign currency translation adjustments 25,542 25,542 25,542 (51,084 ) 25,542 Comprehensive income attributable to WESCO International, Inc. $ 76,182 $ 72,351 $ 81,250 $ (152,500 ) $ 77,283 Condensed Consolidating Statement of Income and Comprehensive Income Three Months Ended June 30, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 894,199 $ 1,140,850 $ (29,884 ) $ 2,005,165 Cost of goods sold (excluding depreciation and amortization) — 720,938 902,383 (29,884 ) 1,593,437 Selling, general and administrative expenses 2 144,766 133,941 — 278,709 Depreciation and amortization — 4,914 12,272 — 17,186 Results of affiliates’ operations 73,172 61,502 — (134,674 ) — Interest expense, net 6,084 18,328 (4,075 ) — 20,337 Provision for income taxes (1,700 ) 1,465 26,944 — 26,709 Net income 68,786 65,290 69,385 (134,674 ) 68,787 Net loss attributable to noncontrolling interest — — (15 ) — (15 ) Net income attributable to WESCO International, Inc. $ 68,786 $ 65,290 $ 69,400 $ (134,674 ) $ 68,802 Other comprehensive income: Foreign currency translation adjustments 43,023 43,023 43,023 (86,046 ) 43,023 Comprehensive income attributable to WESCO International, Inc. $ 111,809 $ 108,313 $ 112,423 $ (220,720 ) $ 111,825 Condensed Consolidating Statement of Income and Comprehensive Income Six Months Ended June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 1,724,052 $ 2,067,504 $ (58,508 ) $ 3,733,048 Cost of goods sold (excluding depreciation and amortization) — 1,383,896 1,658,335 (58,508 ) 2,983,723 Selling, general and administrative expenses 16 284,322 255,488 — 539,826 Depreciation and amortization — 9,774 22,286 — 32,060 Results of affiliates’ operations 106,194 82,655 — (188,849 ) — Interest expense, net 12,388 35,880 (8,760 ) — 39,508 Provision for income taxes (3,641 ) 2,989 41,152 — 40,500 Net income 97,431 89,846 99,003 (188,849 ) 97,431 Net loss attributable to noncontrolling interest — — (1,341 ) — (1,341 ) Net income attributable to WESCO International, Inc. $ 97,431 $ 89,846 $ 100,344 $ (188,849 ) $ 98,772 Other comprehensive loss: Foreign currency translation adjustments (88,257 ) (88,257 ) (88,257 ) 176,514 (88,257 ) Comprehensive income attributable to WESCO International, Inc. $ 9,174 $ 1,589 $ 12,087 $ (12,335 ) $ 10,515 Condensed Consolidating Statement of Income and Comprehensive Income Six Months Ended June 30, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 1,723,670 $ 2,148,303 $ (55,982 ) $ 3,815,991 Cost of goods sold (excluding depreciation and amortization) — 1,379,523 1,705,929 (55,982 ) 3,029,470 Selling, general and administrative expenses 2 281,446 262,723 — 544,171 Depreciation and amortization — 9,614 23,944 — 33,558 Results of affiliates’ operations 129,382 102,215 — (231,597 ) — Interest expense, net 12,153 37,090 (8,218 ) — 41,025 Provision for income taxes (3,414 ) 4,511 46,028 — 47,125 Net income 120,641 113,701 117,897 (231,597 ) 120,642 Net loss attributable to noncontrolling interest — — (65 ) — (65 ) Net income attributable to WESCO International, Inc. $ 120,641 $ 113,701 $ 117,962 $ (231,597 ) $ 120,707 Other comprehensive loss: Foreign currency translation adjustments (3,477 ) (3,477 ) (3,477 ) 6,954 (3,477 ) Comprehensive income attributable to WESCO International, Inc. $ 117,164 $ 110,224 $ 114,485 $ (224,643 ) $ 117,230 Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net cash provided by operating activities $ 2,440 $ 91,787 $ 38,414 $ — $ 132,641 Investing activities: Capital expenditures — (7,144 ) (5,480 ) — (12,624 ) Acquisition payments, net of cash acquired — (68,502 ) — — (68,502 ) Other — (76,769 ) 1,425 76,769 1,425 Net cash used in investing activities — (152,415 ) (4,055 ) 76,769 (79,701 ) Financing activities: Borrowings 76,769 598,269 256,327 (76,769 ) 854,596 Repayments — (528,464 ) (250,996 ) — (779,460 ) Equity activities (80,749 ) — — — (80,749 ) Other 1,540 2,040 — — 3,580 Net cash (used in) provided by financing activities (2,440 ) 71,845 5,331 (76,769 ) (2,033 ) Effect of exchange rate changes on cash and cash equivalents — — (4,919 ) — (4,919 ) Net change in cash and cash equivalents — 11,217 34,771 — 45,988 Cash and cash equivalents at the beginning of period — 32,508 95,811 — 128,319 Cash and cash equivalents at the end of period $ — $ 43,725 $ 130,582 $ — $ 174,307 Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net cash provided by (used in) operating activities $ 1,063 $ 57,016 $ (7,237 ) $ — $ 50,842 Investing activities: Capital expenditures — (8,380 ) (3,405 ) — (11,785 ) Acquisition payments, net of cash acquired — (42,131 ) (91,187 ) — (133,318 ) Other — 675 27 (675 ) 27 Net cash used in investing activities — (49,836 ) (94,565 ) (675 ) (145,076 ) Financing activities: Borrowings — 409,460 230,461 — 639,921 Repayments (675 ) (402,459 ) (160,572 ) 675 (563,031 ) Equity activities (6,441 ) — — — (6,441 ) Other 6,053 (1,189 ) (3 ) — 4,861 Net cash (used in) provided by financing activities (1,063 ) 5,812 69,886 675 75,310 Effect of exchange rate changes on cash and cash equivalents — — (3,158 ) — (3,158 ) Net change in cash and cash equivalents — 12,992 (35,074 ) — (22,082 ) Cash and cash equivalents at the beginning of period — 31,695 92,030 — 123,725 Cash and cash equivalents at the end of period $ — $ 44,687 $ 56,956 $ — $ 101,643 The unaudited Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2014 includes certain reclassifications to previously reported amounts to conform to the current period presentation.

Subsequent Events SUBSEQUENT EV

Subsequent Events SUBSEQUENT EVENTS (Notes)	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS The Company evaluated subsequent events through July 31, 2015 , the date the financial statements were approved and authorized for issuance, and concluded that no subsequent events have occurred that would require recognition in the unaudited Condensed Consolidated Financial Statements or disclosure in the Notes thereto.

ACCOUNTING POLICIES (Policies)

ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying 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 information should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in WESCO’s 2014 Annual Report on Form 10-K as filed with the SEC on February 24, 2015. The Condensed Consolidated Balance Sheet at December 31, 2014 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America. The unaudited Condensed Consolidated Balance Sheet as of June 30, 2015 , the unaudited Condensed Consolidated Statements of Income and Comprehensive Income for the three and six months ended June 30, 2015 and 2014 , respectively, and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2015 and 2014 , 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 presented herein. All adjustments reflected in the unaudited condensed consolidated financial information are of a normal recurring nature unless indicated. The results for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year.
Reclassification	The Condensed Consolidated Balance Sheet at December 31, 2014 and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2014 include certain reclassifications to previously reported amounts to conform to the current period presentation.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company measures the fair value of financial assets and liabilities in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (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 that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to measurements involving significant unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: • Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date. • 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 June 30, 2015 , the carrying value of WESCO’s 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $179.5 million and the fair value was approximately $839.4 million . At December 31, 2014 , the carrying value of WESCO’s 2029 Debentures was $177.6 million and the fair value was approximately $936.1 million . The reported carrying amounts of WESCO’s other debt instruments approximate their fair values. The Company uses a market approach to fair value all of its debt instruments, utilizing quoted prices in active markets, interest rates and other relevant information generated by market transactions involving similar instruments. Therefore, all of the Company's debt instruments are classified as Level 2 within the valuation hierarchy. For all of the Company's remaining financial instruments, consisting of cash and cash equivalents, accounts receivable, accounts payable and other accrued liabilities, carrying values are considered to approximate fair value due to the short maturity of these instruments.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In May 2014, the FASB and the International Accounting Standards Board issued a converged final standard on the recognition of revenue from contracts with customers. This updated guidance provides a framework for addressing revenue recognition issues and replaces almost all existing revenue recognition guidance in current U.S. generally accepted accounting principles. The core principle of the new standard is for companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard will also result in enhanced disclosures about revenue, provide guidance for transactions that were not previously addressed comprehensively, and improve guidance for multiple-element arrangements. The original standard was effective for fiscal years beginning after December 15, 2016; however, in July 2015, the FASB approved a one-year deferral of this standard. Accordingly, the standard is effective for fiscal years beginning after December 15, 2017. Early adoption is permitted to the original effective date of December 15, 2016 (including interim reporting periods within those periods). Management is currently evaluating the future impact of this guidance on WESCO's financial position, results of operations and cash flows. In June 2014, the FASB issued Accounting Standards Update ("ASU") 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period . The amendments in this ASU require a reporting entity to treat a performance target that affects vesting and could be achieved after the requisite service period as a performance condition. A reporting entity should apply FASB ASC Topic 718, Compensation — Stock Compensation , to awards with performance conditions that affect vesting. For all entities, ASU 2014-12 is effective for annual periods and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. This ASU may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption and to all new or modified awards thereafter. The adoption of this guidance is not expected to have an impact on WESCO's consolidated financial statements and notes thereto. In September 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern. This ASU describes how an entity should assess its ability to meet obligations and sets disclosure requirements for how this information should be disclosed in the financial statements. The standard provides accounting guidance that will be used with existing auditing standards. The amendments in this ASU are effective for the annual period ending after December 15, 2016 and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have an impact on WESCO's consolidated financial statements and notes thereto. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs . To simplify the presentation of debt issuance costs, the amendments in this ASU require that debt issuance costs related to a recognized liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within fiscal years beginning after December 15, 2016. Early adoption is permitted for financial statements that have not been previously issued. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. These disclosures include the nature of and reason for the change in accounting principle, the transition method, a description of the prior-period information that has been retrospectively adjusted, and the effect of the change on the financial statement line items (that is, debt issuance cost asset and the debt liability). Management is currently evaluating the future impact of this guidance on WESCO's financial position, results of operations and cash flows.

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	Six Months Ended (In thousands of dollars) June 30, June 30, Fair value of assets acquired $ 89,786 $ 150,966 Fair value of liabilities assumed 21,284 17,648 Cash paid for acquisitions, net of cash acquired $ 68,502 $ 133,318

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2015
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 and six months ended June 30, 2015 and 2014 , WESCO granted the following stock-settled appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values: Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, Stock-settled appreciation rights granted — 2,295 394,182 274,508 Weighted-average fair value $ — $ 27.71 $ 21.68 $ 30.64 Restricted stock units granted — — 78,292 62,506 Weighted-average fair value $ — $ — $ 69.54 $ 85.35 Performance-based awards granted — — 59,661 44,046 Weighted-average fair value $ — $ — $ 67.81 $ 86.65
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-settled stock appreciation rights and related information for the six months ended June 30, 2015 : Awards Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In years) Aggregate Intrinsic Value (In thousands) Outstanding at December 31, 2014 2,480,745 $ 50.91 Granted 394,182 69.54 Exercised (227,441 ) 35.87 Forfeited (13,643 ) 79.35 Outstanding at June 30, 2015 2,633,843 54.85 5.7 $ 41,895.0 Exercisable at June 30, 2015 1,996,529 $ 48.71 4.6 $ 41,891.2
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2015 : Awards Weighted- Average Fair Value Unvested at December 31, 2014 185,457 $ 73.87 Granted 78,292 69.54 Vested (66,902 ) 65.32 Forfeited (4,179 ) 77.75 Unvested at June 30, 2015 192,668 $ 74.99
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	The following table sets forth a summary of performance-based awards for the six months ended June 30, 2015 : Awards Weighted- Average Fair Value Unvested at December 31, 2014 130,004 $ 80.21 Granted 59,661 67.81 Vested (38,869 ) 72.25 Forfeited (10,800 ) 85.87 Unvested at June 30, 2015 139,996 $ 76.70
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Weighted-Average Assumptions Grant date share price $ 69.54 WESCO expected volatility 26.9 % Peer group median volatility 23.2 % Risk-free interest rate 1.05 % Correlation of peer company returns 95.8 %

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Six Months Ended June 30, (In thousands of dollars, except per share data) 2015 2014 Net income attributable to WESCO International, Inc. $ 98,772 $ 120,707 Weighted-average common shares outstanding used in computing basic earnings per share 44,200 44,399 Common shares issuable upon exercise of dilutive equity awards 795 1,061 Common shares issuable from contingently convertible debentures (see below for basis of calculation) 7,055 7,962 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 52,050 53,422 Earnings per share attributable to WESCO International, Inc. Basic $ 2.23 $ 2.72 Diluted $ 1.90 $ 2.26 The following tables set forth the details of basic and diluted earnings per share: Three Months Ended June 30, (In thousands of dollars, except per share data) 2015 2014 Net income attributable to WESCO International, Inc. $ 51,741 $ 68,802 Weighted-average common shares outstanding used in computing basic earnings per share 43,997 44,449 Common shares issuable upon exercise of dilutive equity awards 767 1,031 Common shares issuable from contingently convertible debentures (see below for basis of calculation) 7,138 7,996 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 51,902 53,476 Earnings per share attributable to WESCO International, Inc. Basic $ 1.18 $ 1.55 Diluted $ 1.00 $ 1.29

EMPLOYEE BENEFIT PLANS Schedule

EMPLOYEE BENEFIT PLANS Schedule of Net Benefit Costs (Tables)	6 Months Ended
	Jun. 30, 2015
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: Three Months Ended Six Months Ended June 30, June 30, (In thousands of dollars) 2015 2014 2015 2014 Service cost $ 1,158 $ 900 $ 2,328 $ 1,800 Interest cost 1,031 1,158 2,073 2,314 Expected return on plan assets (1,351 ) (1,362 ) (2,718 ) (2,723 ) Recognized actuarial gain (4 ) (14 ) (8 ) (28 ) Net periodic benefit cost $ 834 $ 682 $ 1,675 $ 1,363

OTHER FINANCIAL INFORMATION (Ta

OTHER FINANCIAL INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Condensed Balance Sheet [Table Text Block]	Condensed Consolidating Balance Sheet June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Cash and cash equivalents $ — $ 43,725 $ 130,582 $ — $ 174,307 Trade accounts receivable, net — — 1,124,893 — 1,124,893 Inventories, net — 399,924 447,121 — 847,045 Other current assets 3 102,257 125,995 (6,450 ) 221,805 Total current assets 3 545,906 1,828,591 (6,450 ) 2,368,050 Intercompany receivables, net — — 1,838,753 (1,838,753 ) — Property, buildings and equipment, net — 60,246 119,803 — 180,049 Intangible assets, net — 4,193 411,134 — 415,327 Goodwill — 254,899 1,458,219 — 1,713,118 Investments in affiliates 3,322,835 3,823,109 — (7,145,944 ) — Other noncurrent assets 3,943 11,418 34,462 — 49,823 Total assets $ 3,326,781 $ 4,699,771 $ 5,690,962 $ (8,991,147 ) $ 4,726,367 Accounts payable $ — $ 454,136 $ 316,469 $ — $ 770,605 Short-term debt — — 46,924 — 46,924 Other current liabilities 12,463 58,246 129,923 (6,450 ) 194,182 Total current liabilities 12,463 512,382 493,316 (6,450 ) 1,011,711 Intercompany payables, net 1,245,134 593,619 — (1,838,753 ) — Long-term debt, net 179,526 753,014 504,262 — 1,436,802 Other noncurrent liabilities 21,887 251,872 138,152 — 411,911 Total WESCO International, Inc. stockholders' equity 1,867,771 2,588,884 4,557,060 (7,145,944 ) 1,867,771 Noncontrolling interest — — (1,828 ) — (1,828 ) Total liabilities and stockholders’ equity $ 3,326,781 $ 4,699,771 $ 5,690,962 $ (8,991,147 ) $ 4,726,367 Condensed Consolidating Balance Sheet December 31, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Cash and cash equivalents $ — $ 32,508 $ 95,811 $ — $ 128,319 Trade accounts receivable, net — — 1,117,420 — 1,117,420 Inventories, net — 373,938 445,564 — 819,502 Other current assets 12 144,282 147,268 (6,465 ) 285,097 Total current assets 12 550,728 1,806,063 (6,465 ) 2,350,338 Intercompany receivables, net — — 1,806,215 (1,806,215 ) — Property, buildings and equipment, net — 56,735 125,990 — 182,725 Intangible assets, net — 4,733 425,107 — 429,840 Goodwill — 246,771 1,488,669 — 1,735,440 Investments in affiliates 3,304,914 3,828,727 — (7,133,641 ) — Other noncurrent assets 4,083 12,844 39,167 — 56,094 Total assets $ 3,309,009 $ 4,700,538 $ 5,691,211 $ (8,946,321 ) $ 4,754,437 Accounts payable $ — $ 445,680 $ 319,455 $ — $ 765,135 Short-term debt — — 46,787 — 46,787 Other current liabilities 12,465 113,746 132,204 (6,465 ) 251,950 Total current liabilities 12,465 559,426 498,446 (6,465 ) 1,063,872 Intercompany payables, net 1,168,366 637,849 — (1,806,215 ) — Long-term debt, net 177,638 683,407 505,385 — 1,366,430 Other noncurrent liabilities 21,888 232,544 141,538 — 395,970 Total WESCO International, Inc. stockholders' equity 1,928,652 2,587,312 4,546,329 (7,133,641 ) 1,928,652 Noncontrolling interest — — (487 ) — (487 ) Total liabilities and stockholders’ equity $ 3,309,009 $ 4,700,538 $ 5,691,211 $ (8,946,321 ) $ 4,754,437

OTHER FINANCIAL INFORMATION Con

OTHER FINANCIAL INFORMATION Condensed Income Statement (Tables)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Income Statements, Captions [Line Items]
Condensed Income Statement [Table Text Block]	Condensed Consolidating Statement of Income and Comprehensive Income Three Months Ended June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 884,769 $ 1,062,255 $ (30,306 ) $ 1,916,718 Cost of goods sold (excluding depreciation and amortization) — 714,088 851,302 (30,306 ) 1,535,084 Selling, general and administrative expenses 9 147,911 127,322 — 275,242 Depreciation and amortization — 4,940 11,199 — 16,139 Results of affiliates’ operations 55,029 46,387 — (101,416 ) — Interest expense, net 6,200 17,240 (4,827 ) — 18,613 Provision for income taxes (1,820 ) 168 22,653 — 21,001 Net income 50,640 46,809 54,606 (101,416 ) 50,639 Net loss attributable to noncontrolling interest — — (1,102 ) — (1,102 ) Net income attributable to WESCO International, Inc. $ 50,640 $ 46,809 $ 55,708 $ (101,416 ) $ 51,741 Other comprehensive income: Foreign currency translation adjustments 25,542 25,542 25,542 (51,084 ) 25,542 Comprehensive income attributable to WESCO International, Inc. $ 76,182 $ 72,351 $ 81,250 $ (152,500 ) $ 77,283 Condensed Consolidating Statement of Income and Comprehensive Income Six Months Ended June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 1,724,052 $ 2,067,504 $ (58,508 ) $ 3,733,048 Cost of goods sold (excluding depreciation and amortization) — 1,383,896 1,658,335 (58,508 ) 2,983,723 Selling, general and administrative expenses 16 284,322 255,488 — 539,826 Depreciation and amortization — 9,774 22,286 — 32,060 Results of affiliates’ operations 106,194 82,655 — (188,849 ) — Interest expense, net 12,388 35,880 (8,760 ) — 39,508 Provision for income taxes (3,641 ) 2,989 41,152 — 40,500 Net income 97,431 89,846 99,003 (188,849 ) 97,431 Net loss attributable to noncontrolling interest — — (1,341 ) — (1,341 ) Net income attributable to WESCO International, Inc. $ 97,431 $ 89,846 $ 100,344 $ (188,849 ) $ 98,772 Other comprehensive loss: Foreign currency translation adjustments (88,257 ) (88,257 ) (88,257 ) 176,514 (88,257 ) Comprehensive income attributable to WESCO International, Inc. $ 9,174 $ 1,589 $ 12,087 $ (12,335 ) $ 10,515 Condensed Consolidating Statement of Income and Comprehensive Income Three Months Ended June 30, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 894,199 $ 1,140,850 $ (29,884 ) $ 2,005,165 Cost of goods sold (excluding depreciation and amortization) — 720,938 902,383 (29,884 ) 1,593,437 Selling, general and administrative expenses 2 144,766 133,941 — 278,709 Depreciation and amortization — 4,914 12,272 — 17,186 Results of affiliates’ operations 73,172 61,502 — (134,674 ) — Interest expense, net 6,084 18,328 (4,075 ) — 20,337 Provision for income taxes (1,700 ) 1,465 26,944 — 26,709 Net income 68,786 65,290 69,385 (134,674 ) 68,787 Net loss attributable to noncontrolling interest — — (15 ) — (15 ) Net income attributable to WESCO International, Inc. $ 68,786 $ 65,290 $ 69,400 $ (134,674 ) $ 68,802 Other comprehensive income: Foreign currency translation adjustments 43,023 43,023 43,023 (86,046 ) 43,023 Comprehensive income attributable to WESCO International, Inc. $ 111,809 $ 108,313 $ 112,423 $ (220,720 ) $ 111,825	Condensed Consolidating Statement of Income and Comprehensive Income Six Months Ended June 30, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net sales $ — $ 1,723,670 $ 2,148,303 $ (55,982 ) $ 3,815,991 Cost of goods sold (excluding depreciation and amortization) — 1,379,523 1,705,929 (55,982 ) 3,029,470 Selling, general and administrative expenses 2 281,446 262,723 — 544,171 Depreciation and amortization — 9,614 23,944 — 33,558 Results of affiliates’ operations 129,382 102,215 — (231,597 ) — Interest expense, net 12,153 37,090 (8,218 ) — 41,025 Provision for income taxes (3,414 ) 4,511 46,028 — 47,125 Net income 120,641 113,701 117,897 (231,597 ) 120,642 Net loss attributable to noncontrolling interest — — (65 ) — (65 ) Net income attributable to WESCO International, Inc. $ 120,641 $ 113,701 $ 117,962 $ (231,597 ) $ 120,707 Other comprehensive loss: Foreign currency translation adjustments (3,477 ) (3,477 ) (3,477 ) 6,954 (3,477 ) Comprehensive income attributable to WESCO International, Inc. $ 117,164 $ 110,224 $ 114,485 $ (224,643 ) $ 117,230

OTHER FINANCIAL INFORMATION C23

OTHER FINANCIAL INFORMATION Condensed Cash Flow Statement (Tables)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Condensed Cash Flow Statement [Table Text Block]	Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2015 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net cash provided by operating activities $ 2,440 $ 91,787 $ 38,414 $ — $ 132,641 Investing activities: Capital expenditures — (7,144 ) (5,480 ) — (12,624 ) Acquisition payments, net of cash acquired — (68,502 ) — — (68,502 ) Other — (76,769 ) 1,425 76,769 1,425 Net cash used in investing activities — (152,415 ) (4,055 ) 76,769 (79,701 ) Financing activities: Borrowings 76,769 598,269 256,327 (76,769 ) 854,596 Repayments — (528,464 ) (250,996 ) — (779,460 ) Equity activities (80,749 ) — — — (80,749 ) Other 1,540 2,040 — — 3,580 Net cash (used in) provided by financing activities (2,440 ) 71,845 5,331 (76,769 ) (2,033 ) Effect of exchange rate changes on cash and cash equivalents — — (4,919 ) — (4,919 ) Net change in cash and cash equivalents — 11,217 34,771 — 45,988 Cash and cash equivalents at the beginning of period — 32,508 95,811 — 128,319 Cash and cash equivalents at the end of period $ — $ 43,725 $ 130,582 $ — $ 174,307	Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2014 (In thousands of dollars) WESCO International, Inc. WESCO Distribution, Inc. Non-Guarantor Subsidiaries Consolidating and Eliminating Entries Consolidated Net cash provided by (used in) operating activities $ 1,063 $ 57,016 $ (7,237 ) $ — $ 50,842 Investing activities: Capital expenditures — (8,380 ) (3,405 ) — (11,785 ) Acquisition payments, net of cash acquired — (42,131 ) (91,187 ) — (133,318 ) Other — 675 27 (675 ) 27 Net cash used in investing activities — (49,836 ) (94,565 ) (675 ) (145,076 ) Financing activities: Borrowings — 409,460 230,461 — 639,921 Repayments (675 ) (402,459 ) (160,572 ) 675 (563,031 ) Equity activities (6,441 ) — — — (6,441 ) Other 6,053 (1,189 ) (3 ) — 4,861 Net cash (used in) provided by financing activities (1,063 ) 5,812 69,886 675 75,310 Effect of exchange rate changes on cash and cash equivalents — — (3,158 ) — (3,158 ) Net change in cash and cash equivalents — 12,992 (35,074 ) — (22,082 ) Cash and cash equivalents at the beginning of period — 31,695 92,030 — 123,725 Cash and cash equivalents at the end of period $ — $ 44,687 $ 56,956 $ — $ 101,643

ORGANIZATION (Details)

ORGANIZATION (Details)	Jun. 30, 2015distribution_centerscustomerscountriesbranches	Jun. 30, 2014branches
Restructuring Cost and Reserve [Line Items]
Active customers (in customers) | customers	75,000
Full service branches (in branches)	9
Additional countries (in countries) | countries	16
Hazmasters, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Full service branches (in branches)		14

ACCOUNTING POLICIES (Details)

ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Long-term Debt, Fair Value	$ 839.4	$ 936.1
Fixed Rate Debt, Par Value	$ 179.5	$ 177.6

ACQUISITIONS - ACQUISITIONS (De

ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)distribution_centers	Jun. 30, 2014USD ($)branches
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	May 1, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 89,786	$ 150,966
Payments to Acquire Businesses, Gross	68,502	133,318
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 21,284	$ 17,648
Number of Stores	9
Hill Country Electric Supply [Member]
Business Acquisition [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	$ 140,000
Finite-lived Intangible Assets Acquired	21,100
Goodwill, Acquired During Period	15,800
LaPrairie [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Feb. 1, 2014
Finite-lived Intangible Assets Acquired		$ 11,000
LaPrairie, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		30,000
Goodwill, Acquired During Period		$ 8,900
Hazmasters, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Mar. 17, 2014
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		$ 80,000
Finite-lived Intangible Assets Acquired		28,100
Goodwill, Acquired During Period		$ 29,500
Number of Stores | branches		14
Hi-Line [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jun. 11, 2014
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		$ 30,000
Finite-lived Intangible Assets Acquired		14,200
Goodwill, Acquired During Period		24,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		38,900
Customer Relationships [Member] | Hill Country Electric Supply [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 13,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years
Noncompete Agreements [Member] | Hill Country Electric Supply [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 200
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Supplier Relationships [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 3,200
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Trademarks [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 10,900
Trademarks [Member] | Hill Country Electric Supply [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 7,800
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 300
Minimum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		2 years
Minimum [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		5 years
Maximum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		12 years
Maximum [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years

SCHEDULE OF SHARE-BASED COMPENS

SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement By Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding [Roll Forward]
Weighted Average Exercise Price, Exercises in Period (in dollars per share)			$ 35.87
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, Options, Outstanding, Number	2,633,843		2,633,843		2,480,745
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 69.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 41,891,200		$ 41,891,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 54.85		$ 54.85		$ 50.91
Share-based Compensation Arrangement By Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding [Roll Forward]
Grants in Period (in shares)	0	2,295	394,182	274,508
Exercises in Period (in shares)			227,441
Forfeitures in Period (in shares)			13,643
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)			$ 79.35
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 48.71		$ 48.71
Weighted Average Remaining Contractual Term, Outstanding (in years)			5 years 8 months 12 days
Weighted Average Remaining Contractual Term, Exercisable (in years)			4 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 41,895,000		$ 41,895,000

SCHEDULE OF SHARE-BASED PAYMENT

SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	0.00%	1.60%	1.60%	1.50%
Expected life (in years)		5 years	5 years	5 years
WESCO expected volatility	0.00%	34.00%	32.00%	39.00%
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	2,295	394,182	274,508
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 27.71	$ 21.68	$ 30.64
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	78,292	62,506
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 69.54	$ 85.35
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	59,661	44,046
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 67.81	$ 86.65
Risk free interest rate			0.00%
WESCO expected volatility			0.00%

SUMMARY OF RESTRICTED STOCK UNI

SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	192,668		192,668		185,457
Granted (in shares)	0	0	78,292	62,506
Vested (in shares)			(66,902)
Forfeited (in shares)			(4,179)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 74.99		$ 74.99		$ 73.87
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0	69.54	$ 85.35
Vested in Period, Weighted Average Fair Value (in dollars per share)			65.32
Forfeited in Period, Weighted Average Fair Value (in dollars per share)			$ 77.75

SUMMARY OF PERFORMANCE-BASED AW

SUMMARY OF PERFORMANCE-BASED AWARDS (Details) - Performance Shares [Member] - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	139,996		139,996		130,004
Granted (in shares)	0	0	59,661	44,046
Vested (in shares)			(38,869)
Forfeited (in shares)			(10,800)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 76.70		$ 76.70		$ 80.21
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0	67.81	$ 86.65
Vested in Period, Weighted Average Fair Value (in dollars per share)			72.25
Forfeited in Period, Weighted Average Fair Value (in dollars per share)			$ 85.87

SCHEDULE OF SHARE-BASED PAYME31

SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
WESCO expected volatility	0.00%	34.00%	32.00%	39.00%
Risk free interest rate	0.00%	1.60%	1.60%	1.50%
Correlation			0.00%
Fair Value Assumptions, Expected Volatility Rate			0.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price					$ 69.54
WESCO expected volatility			0.00%
Risk free interest rate			0.00%

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4	$ 4.3	$ 7.6	$ 7.8	$ 8.5	$ 0.7	$ 6.1	$ 11.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				15.3	22.9
Total unrecognized compensation cost	$ 25.8			25.8
Cash received from exercise of options					0.8
Tax benefit associated with exercise of awards				$ 5.5	$ 8.7
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)	69,998			69,998
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)	$ 0	$ 27.71		$ 21.68	$ 30.64
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)	$ 0	0		$ 69.54	85.35
Performance-based awards outstanding (in shares)	192,668			192,668					185,457
Performance-based Awards - Peer Group Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0		$ 67.81	$ 86.65
Performance-based awards outstanding (in shares)	139,996			139,996					130,004
Performance-based Awards - Average Growth of Net Income [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based awards outstanding (in shares)	69,998			69,998

SCHEDULE OF EARNINGS PER SHARE,

SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 51,741	$ 68,802	$ 98,772	$ 120,707
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	43,997	44,449	44,200	44,399
Common shares issuable upon exercise of dilutive stock options (in shares)	767	1,031	795	1,061
Common shares issuable from contingently convertible debentures (in shares)	7,138	7,996	7,055	7,962
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	51,902	53,476	52,050	53,422
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 1.18	$ 1.55	$ 2.23	$ 2.72
Diluted (in dollars per share)	$ 1	$ 1.29	$ 1.90	$ 2.26

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Earnings Per Share Dilution Limit (in shares)	7,138,000	7,996,000	7,055,000	7,962,000
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			900,000	500,000
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount		$ 84.71	$ 74.93	$ 79.37
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 28.87		$ 28.87
Earnings Per Share Dilution Limit (in shares)	11,947,671
Dilutive Securities, Effect on Basic Earnings Per Share	$ 0.16	$ 0.22	$ 0.30	$ 0.40

EARNINGS PER SHARE Accelerated

EARNINGS PER SHARE Accelerated Share Repurchase (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Accelerated Share Repurchases [Line Items]
Payments for Repurchase of Common Stock	$ 80,749	$ 6,441
Stock Repurchase Program, Authorized Amount	$ 300,000
Treasury Stock, Shares, Acquired	1,050,927
Repurchase Agreements [Member]
Accelerated Share Repurchases [Line Items]
Payments for Repurchase of Common Stock	$ (75,000)

EMPLOYEE BENEFIT PLANS (Details

EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Contributions by Employer	$ 0.5	$ 1
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan, Cost Recognized		$ 14.3	$ 15
CANADA | Minimum [Member]
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent		3.00%
CANADA | Maximum [Member]
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent		5.00%
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%

EMPLOYEE BENEFIT PLANS EMPLOYEE

EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Contributions by Employer	$ 500		$ 1,000
Service cost	1,158	$ 900	2,328	$ 1,800
Interest cost	1,031	1,158	2,073	2,314
Expected return on plan assets	(1,351)	(1,362)	(2,718)	(2,723)
Defined Benefit Plan, Actuarial Gain (Loss)	(4)	(14)	(8)	(28)
Net periodic benefit cost	$ 834	$ 682	$ 1,675	$ 1,363

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2015	Mar. 31, 2013	Jun. 30, 2015	Dec. 31, 2012	Jun. 30, 2013
Loss Contingencies [Line Items]
Loss Contingency, Accrual, Current					$ 3.9
Damages sought			$ 50
Loss Contingency, Damages Paid, Value	$ 35.8
Litigation Settlement, Amount	36.1
Loss Contingency, Damages Awarded, Value		$ 36.1		$ 36.1
Litigation Settlement Interest	$ 10.2

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Contingency [Line Items]
Effective tax rate	29.30%	27.96871%	29.40%
Federal statutory rate			35.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent				$ 0.281

OTHER FINANCIAL INFORMATION (De

OTHER FINANCIAL INFORMATION (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.375%
Convertible Senior Debentures Due in 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 344.9
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Condensed Financial Information [Line Items]
Cash and cash equivalents	$ 174,307	$ 128,319	$ 101,643	$ 123,725
Trade accounts receivable, net	1,124,893	1,117,420
Inventories, net	847,045	819,502
Total current assets	2,368,050	2,350,338
Property, buildings and equipment, net	180,049	182,725
Intangible assets, net	415,327	429,840
Goodwill and other intangibles, net	1,713,118	1,735,440
Other assets	49,823	56,094
Total assets	4,726,367	4,754,437
Accounts payable	770,605	765,135
Short-term debt	46,924	46,787
Total current liabilities	1,011,711	1,063,872
Total stockholders' equity	1,867,771	1,928,652
Stockholders' Equity Attributable to Noncontrolling Interest	1,828	487
Total liabilities and stockholders' equity	4,726,367	4,754,437
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	3	12
Total current assets	3	12
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	3,322,835	3,304,914
Other assets	3,943	4,083
Total assets	3,326,781	3,309,009
Accounts payable	0	0
Short-term debt	0	0
Other Liabilities, Current	12,463	12,465
Total current liabilities	12,463	12,465
Intercompany payables, net	1,245,134	1,168,366
Long-term debt	179,526	177,638
Liabilities, Other than Long-term Debt, Noncurrent	21,887	21,888
Total stockholders' equity	1,867,771	1,928,652
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
Total liabilities and stockholders' equity	3,326,781	3,309,009
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	43,725	32,508	44,687	31,695
Trade accounts receivable, net	0	0
Inventories, net	399,924	373,938
Other current assets	102,257	144,282
Total current assets	545,906	550,728
Intercompany receivables, net	0	0
Property, buildings and equipment, net	60,246	56,735
Intangible assets, net	4,193	4,733
Goodwill and other intangibles, net	254,899	246,771
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,823,109	3,828,727
Other assets	11,418	12,844
Total assets	4,699,771	4,700,538
Accounts payable	454,136	445,680
Short-term debt	0	0
Other Liabilities, Current	58,246	113,746
Total current liabilities	512,382	559,426
Intercompany payables, net	593,619	637,849
Long-term debt	753,014	683,407
Liabilities, Other than Long-term Debt, Noncurrent	251,872	232,544
Total stockholders' equity	2,588,884	2,587,312
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
Total liabilities and stockholders' equity	4,699,771	4,700,538
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	130,582	95,811	56,956	92,030
Trade accounts receivable, net	1,124,893	1,117,420
Inventories, net	447,121	445,564
Other current assets	125,995	147,268
Total current assets	1,828,591	1,806,063
Intercompany receivables, net	1,838,753	1,806,215
Property, buildings and equipment, net	119,803	125,990
Intangible assets, net	411,134	425,107
Goodwill and other intangibles, net	1,458,219	1,488,669
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Other assets	34,462	39,167
Total assets	5,690,962	5,691,211
Accounts payable	316,469	319,455
Short-term debt	46,924	46,787
Other Liabilities, Current	129,923	132,204
Total current liabilities	493,316	498,446
Intercompany payables, net	0	0
Long-term debt	504,262	505,385
Liabilities, Other than Long-term Debt, Noncurrent	138,152	141,538
Total stockholders' equity	4,557,060	4,546,329
Stockholders' Equity Attributable to Noncontrolling Interest	1,828	487
Total liabilities and stockholders' equity	5,690,962	5,691,211
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	(6,450)	(6,465)
Total current assets	(6,450)	(6,465)
Intercompany receivables, net	(1,838,753)	(1,806,215)
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	(7,145,944)	(7,133,641)
Other assets	0	0
Total assets	(8,991,147)	(8,946,321)
Accounts payable	0	0
Short-term debt	0	0
Other Liabilities, Current	(6,450)	(6,465)
Total current liabilities	(6,450)	(6,465)
Intercompany payables, net	(1,838,753)	(1,806,215)
Long-term debt	0	0
Liabilities, Other than Long-term Debt, Noncurrent	0	0
Total stockholders' equity	(7,145,944)	(7,133,641)
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
Total liabilities and stockholders' equity	(8,991,147)	(8,946,321)
Consolidated Entities [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	174,307	128,319	$ 101,643	$ 123,725
Trade accounts receivable, net	1,124,893	1,117,420
Inventories, net	847,045	819,502
Other current assets	221,805	285,097
Total current assets	2,368,050	2,350,338
Intercompany receivables, net	0	0
Property, buildings and equipment, net	180,049	182,725
Intangible assets, net	415,327	429,840
Goodwill and other intangibles, net	1,713,118	1,735,440
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Other assets	49,823	56,094
Total assets	4,726,367	4,754,437
Accounts payable	770,605	765,135
Short-term debt	46,924	46,787
Other Liabilities, Current	194,182	251,950
Total current liabilities	1,011,711	1,063,872
Intercompany payables, net	0	0
Long-term debt	1,436,802	1,366,430
Liabilities, Other than Long-term Debt, Noncurrent	411,911	395,970
Total stockholders' equity	1,867,771	1,928,652
Stockholders' Equity Attributable to Noncontrolling Interest	1,828	487
Total liabilities and stockholders' equity	$ 4,726,367	$ 4,754,437

CONDENSED CONSOLIDATED INCOME S

CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Information [Line Items]
Net sales	$ 1,916,718	$ 2,005,165	$ 3,733,048	$ 3,815,991
Cost of goods sold	1,535,084	1,593,437	2,983,723	3,029,470
Selling, general and administrative expense	275,242	278,709	539,826	544,171
Depreciation and amortization	16,139	17,186	32,060	33,558
Provision for income taxes	21,001	26,709	40,500	47,125
Net income (loss)	50,639	68,787	97,431	120,642
Less: Net (loss) income attributable to noncontrolling interest	(1,102)	(15)	(1,341)	(65)
Net income (loss) attributable to WESCO International, Inc.	51,741	68,802	98,772	120,707
Comprehensive Income:
Foreign currency translation adjustment	25,542	43,023	(88,257)	(3,477)
Comprehensive income attributable to WESCO International, Inc.	77,283	111,825	10,515	117,230
Parent Company [Member]
Condensed Financial Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				(3,414)
Net sales		0	0	0
Cost of goods sold	0	0	0	0
Selling, general and administrative expense	9	2	16	2
Depreciation and amortization	0	0	0	0
Affiliate Costs	55,029	73,172	106,194	129,382
Interest expense, net	(6,200)	(6,084)	(12,388)	(12,153)
Provision for income taxes	(1,820)	(1,700)	(3,641)	120,641
Net income (loss)	50,640	68,786	97,431	0
Less: Net (loss) income attributable to noncontrolling interest	0	0	0	120,641
Net income (loss) attributable to WESCO International, Inc.	50,640	68,786	97,431
Comprehensive Income:
Foreign currency translation adjustment	25,542	43,023	(88,257)	(3,477)
Comprehensive income attributable to WESCO International, Inc.	76,182	111,809	9,174	117,164
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				4,511
Net sales	884,769	894,199	1,724,052	1,723,670
Cost of goods sold	714,088	720,938	1,383,896	1,379,523
Selling, general and administrative expense	147,911	144,766	284,322	281,446
Depreciation and amortization	4,940	4,914	9,774	9,614
Affiliate Costs	46,387	61,502	82,655	102,215
Interest expense, net	(17,240)	(18,328)	(35,880)	(37,090)
Provision for income taxes	168	1,465	2,989	113,701
Net income (loss)	46,809	65,290	89,846	0
Less: Net (loss) income attributable to noncontrolling interest	0	0	0	113,701
Net income (loss) attributable to WESCO International, Inc.	46,809	65,290	89,846
Comprehensive Income:
Foreign currency translation adjustment	25,542	43,023	(88,257)	(3,477)
Comprehensive income attributable to WESCO International, Inc.	72,351	108,313	1,589	110,224
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				46,028
Net sales	1,062,255	1,140,850	2,067,504	2,148,303
Cost of goods sold	851,302	902,383	1,658,335	1,705,929
Selling, general and administrative expense	127,322	133,941	255,488	262,723
Depreciation and amortization	11,199	12,272	22,286	23,944
Affiliate Costs	0	0	0	0
Interest expense, net	(4,827)	(4,075)	8,760	8,218
Provision for income taxes	22,653	26,944	41,152	117,897
Net income (loss)	54,606	69,385	99,003	(65)
Less: Net (loss) income attributable to noncontrolling interest	(1,102)	(15)	(1,341)	117,962
Net income (loss) attributable to WESCO International, Inc.	55,708	69,400	100,344
Comprehensive Income:
Foreign currency translation adjustment	25,542	43,023	(88,257)	(3,477)
Comprehensive income attributable to WESCO International, Inc.	81,250	112,423	12,087	114,485
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				0
Net sales	(30,306)	(29,884)	(58,508)	(55,982)
Cost of goods sold	(30,306)	(29,884)	(58,508)	(55,982)
Selling, general and administrative expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Affiliate Costs	(101,416)	(134,674)	(188,849)	(231,597)
Interest expense, net	0	0	0	0
Provision for income taxes	0	0	0	(231,597)
Net income (loss)	(101,416)	(134,674)	(188,849)	0
Less: Net (loss) income attributable to noncontrolling interest	0	0	0	(231,597)
Net income (loss) attributable to WESCO International, Inc.	(101,416)	(134,674)	(188,849)
Comprehensive Income:
Foreign currency translation adjustment	(51,084)	(86,046)	176,514	6,954
Comprehensive income attributable to WESCO International, Inc.	(152,500)	(220,720)	(12,335)	(224,643)
Consolidated Entities [Member]
Condensed Financial Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				47,125
Net sales	1,916,718	2,005,165	3,733,048	3,815,991
Cost of goods sold	1,535,084	1,593,437	2,983,723	3,029,470
Selling, general and administrative expense	275,242	278,709	539,826	544,171
Depreciation and amortization	16,139	17,186	32,060	33,558
Affiliate Costs	0	0	0	0
Interest expense, net	(18,613)	(20,337)	(39,508)	(41,025)
Provision for income taxes	21,001	26,709	40,500	120,642
Net income (loss)	50,639	68,787	97,431	(65)
Less: Net (loss) income attributable to noncontrolling interest	(1,102)	(15)	(1,341)	120,707
Net income (loss) attributable to WESCO International, Inc.	51,741	68,802	98,772
Comprehensive Income:
Foreign currency translation adjustment	25,542	43,023	(88,257)	(3,477)
Comprehensive income attributable to WESCO International, Inc.	$ 77,283	$ 111,825	$ 10,515	$ 117,230

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	$ 1,425	$ 27
Net cash (used) provided by operating activities	132,641	50,842
Investing Activities:
Capital expenditures	(12,624)	(11,785)
Acquisition payments	(68,502)	(133,318)
Net cash used in investing activities	(79,701)	(145,076)
Financing Activities:
Payments for Repurchase of Common Stock	(80,749)	(6,441)
Proceeds from (Payments for) Other Financing Activities	3,580	4,861
Net cash used in financing activities	(2,033)	75,310
Effect of exchange rate changes on cash and cash equivalents	(4,919)	(3,158)
Net change in cash and cash equivalents	45,988	(22,082)
Cash and cash equivalents at the beginning of period	128,319	123,725
Cash and cash equivalents at the end of period	174,307	101,643
Parent Company [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	0	0
Net cash (used) provided by operating activities	2,440	1,063
Investing Activities:
Capital expenditures	0	0
Acquisition payments	0	0
Net cash used in investing activities	0	0
Financing Activities:
Borrowings	76,769	0
Repayments	0	675
Payments for Repurchase of Common Stock	(80,749)	(6,441)
Proceeds from (Payments for) Other Financing Activities	1,540	6,053
Net cash used in financing activities	(2,440)	(1,063)
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	0
Cash and cash equivalents at the end of period	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	(76,769)	675
Net cash (used) provided by operating activities	91,787	57,016
Investing Activities:
Capital expenditures	(7,144)	(8,380)
Acquisition payments	(68,502)	(42,131)
Net cash used in investing activities	(152,415)	(49,836)
Financing Activities:
Borrowings	598,269	409,460
Repayments	(528,464)	(402,459)
Payments for Repurchase of Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	2,040	(1,189)
Net cash used in financing activities	71,845	5,812
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	11,217	12,992
Cash and cash equivalents at the beginning of period	32,508	31,695
Cash and cash equivalents at the end of period	43,725	44,687
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Proceeds from Sale of Productive Assets	(1,425)	(27)
Net cash (used) provided by operating activities	38,414	(7,237)
Investing Activities:
Capital expenditures	(5,480)	(3,405)
Acquisition payments	0	(91,187)
Net cash used in investing activities	(4,055)	(94,565)
Financing Activities:
Borrowings	256,327	230,461
Repayments	(250,996)	(160,572)
Payments for Repurchase of Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0	(3)
Net cash used in financing activities	5,331	69,886
Effect of exchange rate changes on cash and cash equivalents	(4,919)	(3,158)
Net change in cash and cash equivalents	34,771	(35,074)
Cash and cash equivalents at the beginning of period	95,811	92,030
Cash and cash equivalents at the end of period	130,582	56,956
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	76,769	(675)
Net cash (used) provided by operating activities	0	0
Investing Activities:
Capital expenditures	0	0
Acquisition payments	0	0
Net cash used in investing activities	76,769	(675)
Financing Activities:
Borrowings	(76,769)	0
Repayments	0	(675)
Payments for Repurchase of Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Net cash used in financing activities	(76,769)	675
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	0
Cash and cash equivalents at the end of period	0	0
Consolidated Entities [Member]
Condensed Financial Information [Line Items]
Proceeds from Sale of Productive Assets	1,425	27
Net cash (used) provided by operating activities	132,641	50,842
Investing Activities:
Capital expenditures	(12,624)	(11,785)
Acquisition payments	(68,502)	(133,318)
Net cash used in investing activities	(79,701)	(145,076)
Financing Activities:
Borrowings	854,596	639,921
Repayments	(779,460)	(563,031)
Payments for Repurchase of Common Stock	(80,749)	(6,441)
Proceeds from (Payments for) Other Financing Activities	3,580	4,861
Net cash used in financing activities	(2,033)	75,310
Effect of exchange rate changes on cash and cash equivalents	(4,919)	(3,158)
Net change in cash and cash equivalents	45,988	(22,082)
Cash and cash equivalents at the beginning of period	128,319	123,725
Cash and cash equivalents at the end of period	$ 174,307	$ 101,643

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015USD ($)
Hill Country Electric Supply [Member]
Subsequent Event [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	$ 140

Uncategorized Items - wcc-20150

Label	Element	Value
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	1,996,529