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Discussion of whether the debt instrument is secured or unsecured, and, if secured, a description of the collateral and guarantees required or provided.

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of principal amount of debt redeemed.

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Amount, after accumulated amortization, of debt discount.

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DEBT - DEBT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended									24 Months Ended
	Dec. 31, 2014	Aug. 27, 2009	Sep. 30, 2016	Jun. 14, 2022	Jun. 14, 2021	Jun. 14, 2020	Dec. 14, 2019	Dec. 14, 2018	Dec. 14, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 15, 2024	Dec. 15, 2021
Debt Instrument [Line Items]
Accounts Receivable from Securitization										$ 380,000	$ 525,000
Long-term debt										1,401,781
Letters of Credit Outstanding, Amount										26,500	40,300
Extinguishment of Debt, Amount										123,933	0	$ 0
Gain (Loss) on Extinguishment of Debt			$ (123,900)							(123,933)	0	0
Long-term Debt, Gross										1,402,551
Payments of Financing Costs										6,000
Debt discount on convertible debentures										(770)
Amortization of Financing Costs										3,585	6,120	4,426
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt		$ 106,500								(139,765)	(2)	(1)
Debt Instrument, Convertible, Carrying Amount of Equity Component										$ 106,300
Debt Instrument, Call Date, Earliest										Sep. 15, 2016
2014										$ 38,212
2015										36,737
2016										35,507
2017										32,388
2018										24,765
Repayments of Convertible Debt										$ 344,800
Debt Instrument, Convertible, Terms of Conversion Feature			Holders who surrendered the 2029 Debentures for conversion received 18 shares of WESCO stock for each $1,000 principal amount of 2029 Debentures converted.
Debt Conversion, Converted Instrument, Shares Issued										6,267,688
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt										$ 20,920	43,314
Term Loan Facility
Debt Instrument [Line Items]
Debt discount on convertible debentures											(1,026)
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt										$ 500,000	500,000
Debt Instrument, Interest Rate, Stated Percentage										5.375%
Deferred Finance Costs, Gross											8,400
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed										101.00%
Debt Instrument, Face Amount										$ 500,000
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt										$ 350,000	0
Debt Instrument, Interest Rate, Stated Percentage										5.375%
Deferred Finance Costs, Gross											6,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed										101.00%
Debt Instrument, Face Amount										$ 350,000
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral										The Borrowers' obligations under the Term Loan Facility are secured by substantially all of the assets of the Borrowers, the Company and certain of the Company's other subsidiaries; provided that, with respect to borrowings under the U.S. sub-facility, the collateral does not include assets of certain foreign subsidiaries or more than 65% of the issued and outstanding equity interests in certain foreign subsidiaries.
Debt Instrument, Decrease, Repayments	$ 500,000
Long-term debt										$ 143,980	173,724
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Amendment Description										The Receivables Purchase Agreement increased the purchase limit from $500 million to $550 million, with the opportunity to exercise an accordion feature which permits increases in the purchase limit of up to $100 million, extended the term of the Receivables Facility to September 24, 2018 and added and amended certain defined terms. The interest rate spread and commitment fee of the Receivables Facility remained at 0.95% and 0.45%, respectively.
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate										1.40%
Accounts Receivable Eligible for Securitization										$ 657,500	684,700
Long-term debt										$ 380,000	525,000
Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Borrowing Capacity, Description										On September 24, 2015, WESCO International, WESCO Distribution and certain other subsidiaries of the Company entered into a $600 million revolving credit facility (the “Revolving Credit Facility”), which contains a letter of credit sub-facility of up to $125 million, pursuant to the terms and conditions of a Second Amended and Restated Credit Agreement (the "Credit Agreement"). The Revolving Credit Facility contains an accordion feature allowing WESCO Distribution to request increases to the borrowing commitments, subject to customary conditions. This accordion feature increased from $100 million to $200 million in the aggregate. The Revolving Credit Facility replaced WESCO Distribution’s prior revolving credit facility entered into on December 12, 2012.
Debt Instrument, Maturity Date										Sep. 01, 2020
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate										2.00%
Debt Instrument, Increase, Additional Borrowings										$ 1,025,800	1,276,000
Debt Instrument, Decrease, Repayments										1,096,800	1,209,000
Long-term debt										4,000	75,000
Line of Credit Facility, Remaining Borrowing Capacity										$ 509,700	438,700
Convertible Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End										13.875%
Long-term debt										$ 0	181,557
Long-term Debt, Gross										0	344,873
Debt Instrument, Face Amount		345,000
Debt discount on convertible debentures		$ (181,200)								0	(163,316)
Amortization of Financing Costs and Discounts										$ 3,100	$ 4,200	$ 3,800
Canada \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End										2.00%
Debt Instrument, Face Amount										$ 150,000
Canada \| Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity										$ 400,000
United States \| Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum										0.0075
Debt Instrument, Interest Rate, Increase (Decrease)										0.50%
United States \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										1.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate										1.00%
Debt Instrument, Interest Rate at Period End										4.00%
Long-term Debt, Gross										$ 144,800
Debt Instrument, Face Amount										700,000
United States \| Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity										600,000
Minimum \| Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity										300
Maximum \| Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity										$ 21,000
Common Stock
Debt Instrument [Line Items]
Common Stock, Par or Stated Value Per Share										$ 0.01	$ 0.01
London Interbank Offered Rate (LIBOR) [Member] \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										1.25%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										1.75%
Prime Rate [Member] \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										0.25%
Prime Rate [Member] \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										0.75%
Scenario, Forecast [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed							101.344%	102.688%	104.031%					100.00%
Scenario, Forecast [Member] \| Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed				101.344%	102.688%	104.031%							100.00%