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DEBT - DEBT (Details) - USD ($) $ / shares in Units, $ in Thousands | 8 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Aug. 27, 2009 | Jun. 14, 2022 | Jun. 14, 2021 | Jun. 14, 2020 | Dec. 14, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 15, 2024 | Dec. 15, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts Receivable from Securitization |  |  |  |  |  | $ 275,000 | $ 380,000 |  |  |
Long-term debt |  |  |  |  |  | 1,233,100 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | 0 | 0 | $ 123,933 |  |
Debt discount on convertible debentures |  |  |  |  |  | (156) |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | $ 106,500 |  |  |  |  |  |  | (139,765) |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  | 344,800 |  |  |  |
Amortization of Financing Costs and Discounts |  |  |  |  |  | $ 4,482 | 3,984 | 6,684 |  |
Debt Instrument, Call Date, Earliest |  |  |  |  |  | Sep. 15, 2016 |  |  |  |
2014 |  |  |  |  |  | $ 35,269 |  |  |  |
2015 |  |  |  |  |  | 33,417 |  |  |  |
2016 |  |  |  |  |  | 25,809 |  |  |  |
2017 |  |  |  |  |  | 23,431 |  |  |  |
2018 |  |  |  |  |  | $ 22,877 |  |  |  |
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 |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 9,575 | $ 13,711 |  |  |
Foreign Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  | 8.78% | 5.42% |  |  |
Long-term debt |  |  |  |  |  | $ 30,785 | $ 34,075 |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt discount on convertible debentures |  |  |  |  |  | (156) | (513) |  |  |
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, Decrease, Repayments |  |  |  |  |  | 500,000 |  |  |  |
Long-term debt |  |  |  |  |  | $ 24,594 | 84,237 |  |  |
Accounts Receivable Securitization Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amendment Description |  |  |  |  |  | On November 8, 2017, WESCO Distribution amended its accounts receivable securitization facility (the "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 |  |  |  |  |  | 1.95% |  |  |  |
Accounts Receivable Eligible for Securitization |  |  |  |  |  | $ 758,300 | 751,200 |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  | 550,000 |  |  |  |
Long-term debt |  |  |  |  |  | $ 275,000 | 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 |  |  |  |  |  | 3.46% |  |  |  |
Debt Instrument, Increase, Additional Borrowings |  |  |  |  |  | $ 473,100 | 834,400 |  |  |
Debt Instrument, Decrease, Repayments |  |  |  |  |  | 433,500 | 826,400 |  |  |
Long-term debt |  |  |  |  |  | 51,598 | 12,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | $ 515,900 | 562,900 |  |  |
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) |  |  |  |  |  |  |  |  |
Amortization of Financing Costs and Discounts |  |  |  |  |  |  |  | $ 3,100 |  |
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 |  |  |  |  |  | 7.50% |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  |  |  | 1.00% |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 24,800 |  |  |  |
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 |  |  |  |  |  | $ 2,000 |  |  |  |
Minimum | Accounts Receivable Securitization Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 0.95% |  |  |  |
Maximum | Foreign Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 21,000 |  |  |  |
Maximum | Accounts Receivable Securitization Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 0.45% |  |  |  |
Accordion Feature [Member] | Accounts Receivable Securitization Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  | $ 100,000 |  |  |  |
Standby Letters of Credit [Member] | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | $ 18,000 | $ 27,200 |  |  |
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% |  |  |  |  | 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% |
Surety Bond [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | $ 19,500 | $ 19,100 |  |  |
Property Lease Guarantee [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | $ 5,300 | $ 7,100 |  |  |

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