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ACCOUNTING POLICIES - GENERAL (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Dec. 31, 2016
Defined Benefit Plan Disclosure |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 235,834 | $ 0 |  | $ 240,000 |
Income Taxes Receivable, Current | 16,371 | 24,873 |  |  |
Prepaid Expense and Other Assets, Current | 76,076 | 52,107 |  |  |
Assets, Current | 2,540,411 | 2,385,640 |  |  |
Intangible Assets, Net (Including Goodwill) | $ 1,900,000 | 1,800,000 |  |  |
Characteristics of Securitizations or Asset-backed Financing Arrangements that are Accounted for as Sale | Under the Receivables Facility, WESCO sells, on a continuous basis, an undivided interest in all domestic accounts receivable to WESCO Receivables, a wholly owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. Since WESCO maintains control of the transferred receivables, the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the balance sheet, and WESCO recognizes the related secured borrowing. WESCO has agreed to continue servicing the sold receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded. |  |  |  |
Self Insurance Reserve | $ 12,900 | 13,100 |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | 25,400 | 24,500 |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 7,000 | 10,900 | $ 8,500 |  |
Inventory Valuation Reserves | 30,700 | 27,600 |  |  |
Inventory Write-down | 10,000 | 9,700 | 8,800 |  |
General and Administrative Costs in Inventory, Amount Incurred | 71,200 | 69,200 |  |  |
Stock-based compensation expense | 19,062 | 16,445 | 14,809 |  |
Goodwill | 1,759,040 | 1,722,603 | 1,771,877 |  |
Assets | 5,017,635 | 4,605,036 |  |  |
Liabilities, Current | 1,084,059 | 1,061,946 |  |  |
Deferred Tax Liabilities, Net, Noncurrent | 146,617 | 143,967 |  |  |
Liabilities | 2,758,964 | 2,475,310 |  |  |
Retained Earnings (Accumulated Deficit) | 2,530,429 | 2,307,462 | 2,079,697 |  | $ 1,914,757
Accumulated Other Comprehensive Income (Loss), Net of Tax | (367,772) | (408,435) | $ (312,590) |  | $ (391,971)
Stockholders' Equity Attributable to Parent | 2,265,483 | 2,135,310 |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 2,258,671 | 2,129,726 |  |  |
Liabilities and Equity | 5,017,635 | $ 4,605,036 |  |  |
Operating Lease, Liability | $ 241,876 |  |  | $ 245,000 |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Discount rate | 3.20% | 4.00% |  |  |
Minimum |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 2 years |  |  |  |
Maximum |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years |  |  |  |

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