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CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Financial Information [Line Items] |  |
Net sales | $ 1,993,915 | $ 1,772,591
Cost of goods sold | 1,613,966 | 1,422,573
Selling, general and administrative expense | 290,829 | 267,419
Depreciation and amortization | 15,879 | 15,965
Provision for income taxes | 10,487 | 12,568
Net income (loss) | 42,971 | 37,800
Less: Net (loss) income attributable to noncontrolling interest | (1,450) | 71
Net income (loss) attributable to WESCO International, Inc. | 44,421 | 37,729
Comprehensive Income: |  |
Foreign currency translation adjustment | (28,800) | 11,568
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 | 252
Comprehensive income attributable to WESCO International, Inc. | 15,621 | 49,549
Parent Company [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 0 | 0
Cost of goods sold | 0 | 0
Selling, general and administrative expense | 0 | 0
Depreciation and amortization | 0 | 0
Income (Loss) from Subsidiaries, before Tax | 42,971 | 37,800
Other Nonoperating Income (Expense) | 0 | 0
Provision for income taxes | 0 | 0
Net income (loss) | 42,971 | 37,800
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 42,971 | 37,800
Comprehensive Income: |  |
Foreign currency translation adjustment | (28,800) | 11,568
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 14,171 | 49,620
Guarantor Subsidiaries [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 882,399 | 778,611
Cost of goods sold | 716,258 | 621,748
Selling, general and administrative expense | 150,482 | 135,257
Depreciation and amortization | 4,616 | 4,753
Income (Loss) from Subsidiaries, before Tax | 45,200 | 34,428
Other Nonoperating Income (Expense) | 13,816 | 21,008
Provision for income taxes | (544) | (1,037)
Net income (loss) | 42,971 | 31,310
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 42,971 | 31,310
Comprehensive Income: |  |
Foreign currency translation adjustment | (28,800) | 11,568
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 14,171 | 43,130
Non-Guarantor Subsidiaries [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 1,150,110 | 1,019,654
Cost of goods sold | 936,302 | 826,499
Selling, general and administrative expense | 140,347 | 132,162
Depreciation and amortization | 11,263 | 11,212
Income (Loss) from Subsidiaries, before Tax | 0 | 0
Other Nonoperating Income (Expense) | (5,967) | 4,742
Provision for income taxes | 11,031 | 13,605
Net income (loss) | 45,200 | 40,918
Less: Net (loss) income attributable to noncontrolling interest | (1,450) | 71
Net income (loss) attributable to WESCO International, Inc. | 46,650 | 40,847
Comprehensive Income: |  |
Foreign currency translation adjustment | (28,800) | 11,568
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 17,850 | 52,667
Consolidated Entities [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 1,993,915 | 1,772,591
Cost of goods sold | 1,613,966 | 1,422,573
Selling, general and administrative expense | 290,829 | 267,419
Depreciation and amortization | 15,879 | 15,965
Income (Loss) from Subsidiaries, before Tax | 0 | 0
Other Nonoperating Income (Expense) | 19,783 | 16,266
Provision for income taxes | 10,487 | 12,568
Net income (loss) | 42,971 | 37,800
Less: Net (loss) income attributable to noncontrolling interest | (1,450) | 71
Net income (loss) attributable to WESCO International, Inc. | 44,421 | 37,729
Comprehensive Income: |  |
Foreign currency translation adjustment | (28,800) | 11,568
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 15,621 | 49,549
Consolidation, Eliminations [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | (38,594) | (25,674)
Cost of goods sold | (38,594) | (25,674)
Selling, general and administrative expense | 0 | 0
Depreciation and amortization | 0 | 0
Income (Loss) from Subsidiaries, before Tax | (88,171) | (72,228)
Other Nonoperating Income (Expense) | 0 | 0
Provision for income taxes | 0 | 0
Net income (loss) | (88,171) | (72,228)
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | (88,171) | (72,228)
Comprehensive Income: |  |
Foreign currency translation adjustment | 57,600 | (23,136)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 504
Comprehensive income attributable to WESCO International, Inc. | (30,571) | (95,868)
Pension Plan [Member] |  |
Condensed Financial Information [Line Items] |  |
Other Nonoperating Gains (Losses) | $ (500) | $ (500)

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