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CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Condensed Financial Information [Line Items] |  |
Net sales | $ 1,772,591 | $ 1,775,961
Cost of goods sold | 1,422,573 | 1,420,793
Selling, general and administrative expense | 266,964 | 269,286
Depreciation and amortization | 15,965 | 16,374
Provision for income taxes | 12,568 | 16,145
Net income (loss) | 37,800 | 34,534
Less: Net (loss) income attributable to noncontrolling interest | 71 | (1,519)
Net income (loss) attributable to WESCO International, Inc. | 37,729 | 36,053
Comprehensive Income: |  |
Foreign currency translation adjustment | 11,568 | 82,270
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 252 | (16)
Comprehensive income attributable to WESCO International, Inc. | 49,549 | 118,307
Parent Company [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 0 | 0
Cost of goods sold | 0 | 0
Selling, general and administrative expense | 0 | (378)
Depreciation and amortization | 0 | 0
Income (Loss) from Subsidiaries, before Tax | 37,800 | 38,459
Interest Income (Expense), Net | 0 | (6,318)
Provision for income taxes | 0 | (2,015)
Net income (loss) | 37,800 | 34,534
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 37,800 | 34,534
Comprehensive Income: |  |
Foreign currency translation adjustment | 11,568 | 82,270
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (252) | 16
Comprehensive income attributable to WESCO International, Inc. | 49,620 | 116,788
Guarantor Subsidiaries [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 778,611 | 800,490
Cost of goods sold | 621,748 | 639,673
Selling, general and administrative expense | 135,257 | 80,208
Depreciation and amortization | 4,753 | 5,106
Income (Loss) from Subsidiaries, before Tax | 34,428 | (8,684)
Interest Income (Expense), Net | (21,008) | (18,859)
Provision for income taxes | (1,037) | 18,046
Net income (loss) | 31,310 | 29,914
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 31,310 | 29,914
Comprehensive Income: |  |
Foreign currency translation adjustment | 11,568 | 82,270
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (252) | 16
Comprehensive income attributable to WESCO International, Inc. | 43,130 | 112,168
Non-Guarantor Subsidiaries [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 1,019,654 | 1,000,045
Cost of goods sold | 826,499 | 805,694
Selling, general and administrative expense | 131,707 | 189,456
Depreciation and amortization | 11,212 | 11,268
Income (Loss) from Subsidiaries, before Tax | 0 | 0
Interest Income (Expense), Net | (4,287) | (6,348)
Provision for income taxes | 13,605 | 114
Net income (loss) | 40,918 | (139)
Less: Net (loss) income attributable to noncontrolling interest | 71 | (1,519)
Net income (loss) attributable to WESCO International, Inc. | 40,847 | 1,380
Comprehensive Income: |  |
Foreign currency translation adjustment | 11,568 | 82,270
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (252) | 16
Comprehensive income attributable to WESCO International, Inc. | 52,667 | 83,634
Consolidated Entities [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | 1,772,591 | 1,775,961
Cost of goods sold | 1,422,573 | 1,420,793
Selling, general and administrative expense | 266,964 | 269,286
Depreciation and amortization | 15,965 | 16,374
Income (Loss) from Subsidiaries, before Tax | 0 | 0
Interest Income (Expense), Net | (16,721) | (18,829)
Provision for income taxes | 12,568 | 16,145
Net income (loss) | 37,800 | 34,534
Less: Net (loss) income attributable to noncontrolling interest | 71 | (1,519)
Net income (loss) attributable to WESCO International, Inc. | 37,729 | 36,053
Comprehensive Income: |  |
Foreign currency translation adjustment | 11,568 | 82,270
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (252) | 16
Comprehensive income attributable to WESCO International, Inc. | 49,549 | 118,307
Consolidation, Eliminations [Member] |  |
Condensed Financial Information [Line Items] |  |
Net sales | (25,674) | (24,574)
Cost of goods sold | (25,674) | (24,574)
Selling, general and administrative expense | 0 | 0
Depreciation and amortization | 0 | 0
Income (Loss) from Subsidiaries, before Tax | (72,228) | (29,775)
Interest Income (Expense), Net | 0 | 0
Provision for income taxes | 0 | 0
Net income (loss) | (72,228) | (29,775)
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | (72,228) | (29,775)
Comprehensive Income: |  |
Foreign currency translation adjustment | (23,136) | (164,540)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 504 | (32)
Comprehensive income attributable to WESCO International, Inc. | $ (95,868) | $ (194,283)

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