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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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DEBT - DEBT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		8 Months Ended	9 Months Ended	12 Months Ended								24 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Aug. 27, 2009	Sep. 30, 2017	Jun. 14, 2022	Jun. 14, 2021	Jun. 14, 2020	Dec. 14, 2019	Dec. 14, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 15, 2024	Dec. 15, 2021
Debt Instrument [Line Items]
Accounts Receivable from Securitization										$ 380,000
Long-term debt										1,362,271
Letters of Credit Outstanding, Amount										18,000	$ 20,100
Gain (Loss) on Extinguishment of Debt	$ (124,000)			$ 123,900						0	(123,933)	$ 0
Debt Instrument, Face Amount										1,360,000	1,400,000
Debt discount on convertible debentures										(513)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			$ 106,500								(139,765)	(2)
Debt Instrument, Convertible, Carrying Amount of Equity Component										344,800
Amortization of Financing Costs and Discounts										$ 3,984	$ 6,684	12,195
Debt Instrument, Call Date, Earliest										Sep. 15, 2016
2014										$ 37,848
2015										36,549
2016										34,621
2017										26,930
2018										$ 24,350
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]
Debt, Weighted Average Interest Rate										5.42%	7.36%
Long-term debt										$ 34,075	$ 20,920
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	350,000
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, Issuance Date										Dec. 12, 2012
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum										On November 19, 2013, the Borrowers and WESCO International entered into an amendment (the “Term Loan Amendment”) to the Term Loan Agreement. The Term Loan Amendment, among other things, reduced the applicable margin on U.S. term loans by 0.50% and the LIBOR floor applicable to the U.S. sub-facility from 1.00% to 0.75%. The modified pricing terms were effective December 13, 2013.
Debt Instrument, Unused Borrowing Capacity, Amount										$ 300,000
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										$ 84,237	143,980
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Amendment Description										On November 8, 2017, WESCO Distribution amended its Receivables Facility pursuant to the terms and conditions of a Fifth Amendment to Fourth Amended and Restated Receivables Purchase Agreement, by and among WESCO Receivables Corp. (“WESCO Receivables”), WESCO Distribution, the various purchasers from time to time party thereto and PNC Bank, National Association, as Administrator (the "Amendment"). The Amendment extended the term of the Receivables Facility to September 24, 2020 and added and amended certain other defined terms. Substantially all other terms and conditions of the Receivables Facility were unchanged.
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate										1.90%
Accounts Receivable Eligible for Securitization										$ 751,200	657,500
Long-term debt										$ 380,000	380,000
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 of up to $200 million in the aggregate, subject to customary conditions.
Debt Instrument, Maturity Date										Sep. 01, 2020
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate										3.00%
Debt Instrument, Increase, Additional Borrowings										$ 834,400	1,025,800
Debt Instrument, Decrease, Repayments										826,400	1,096,800
Long-term debt										12,000	4,000
Line of Credit Facility, Remaining Borrowing Capacity										$ 562,900	509,700
Convertible Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End										13.875%
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
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 \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate										4.70%
Debt Instrument, Interest Rate at Period End										1.00%
Long-term Debt, Gross										$ 84,800
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%					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%