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CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Financial Information [Line Items] |  |  |  |
Revenues | $ 2,067,245 | $ 2,000,159 | $ 6,165,154 | $ 5,682,375
Cost of goods sold | 1,670,037 | 1,614,814 | 4,988,103 | 4,580,896
Selling, general and administrative expense | 284,073 | 280,497 | 867,790 | 815,653
Depreciation and amortization | 15,618 | 16,074 | 47,321 | 47,758
Provision for income taxes | 13,822 | 18,363 | 40,077 | 47,684
Net income (loss) | 66,645 | 53,576 | 167,289 | 140,915
Less: Net (loss) income attributable to noncontrolling interest | (204) | (99) | (1,921) | (3)
Net income (loss) attributable to WESCO International, Inc. | 66,849 | 53,675 | 169,210 | 140,918
Comprehensive Income: |  |  |  |
Foreign currency translation adjustment | 20,486 | 51,148 | (37,029) | 96,097
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 | 0 | 0 | 252
Comprehensive income attributable to WESCO International, Inc. | 87,335 | 104,823 | 132,181 | 237,267
Parent Company [Member] |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Cost of goods sold | 0 | 0 | 0 | 0
Selling, general and administrative expense | 0 | 0 | 0 | 0
Depreciation and amortization | 0 | 0 | 0 | 0
Income (Loss) from Subsidiaries, before Tax | 66,645 | 53,576 | 167,289 | 140,915
Other Nonoperating Income (Expense) | 0 | 0 | 0 | 0
Provision for income taxes | 0 | 0 | 0 | 0
Net income (loss) | 66,645 | 53,576 | 167,289 | 140,915
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0 | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 66,645 | 53,576 | 167,289 | 140,915
Comprehensive Income: |  |  |  |
Foreign currency translation adjustment | 20,486 | 51,148 | (37,029) | 96,097
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 87,131 | 104,724 | 130,260 | 237,264
Non-Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |
Revenues | 1,206,174 | 1,169,377 | 3,578,653 | 3,289,693
Cost of goods sold | 981,908 | 954,109 | 2,915,387 | 2,675,608
Selling, general and administrative expense | 134,683 | 139,859 | 420,353 | 405,029
Depreciation and amortization | 11,143 | 11,599 | 33,572 | 33,947
Income (Loss) from Subsidiaries, before Tax | 0 | 0 | 0 | 0
Other Nonoperating Income (Expense) | 3,923 | (8,601) | 13,372 | (25,492)
Provision for income taxes | 12,746 | 18,499 | 37,876 | 50,718
Net income (loss) | 61,771 | 53,912 | 158,093 | 149,883
Less: Net (loss) income attributable to noncontrolling interest | (204) | (99) | (1,921) | (3)
Net income (loss) attributable to WESCO International, Inc. | 61,975 | 54,011 | 160,014 | 149,886
Comprehensive Income: |  |  |  |
Foreign currency translation adjustment | 20,486 | 51,148 | (37,029) | 96,097
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 82,461 | 105,159 | 122,985 | 246,235
Consolidated Entities [Member] |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |
Revenues | 2,067,245 | 2,000,159 | 6,165,154 | 5,682,375
Cost of goods sold | 1,670,037 | 1,614,814 | 4,988,103 | 4,580,896
Selling, general and administrative expense | 284,073 | 280,497 | 867,790 | 815,653
Depreciation and amortization | 15,618 | 16,074 | 47,321 | 47,758
Income (Loss) from Subsidiaries, before Tax | 0 | 0 | 0 | 0
Other Nonoperating Income (Expense) | (17,050) | (16,835) | (54,574) | (49,469)
Provision for income taxes | 13,822 | 18,363 | 40,077 | 47,684
Net income (loss) | 66,645 | 53,576 | 167,289 | 140,915
Less: Net (loss) income attributable to noncontrolling interest | (204) | (99) | (1,921) | (3)
Net income (loss) attributable to WESCO International, Inc. | 66,849 | 53,675 | 169,210 | 140,918
Comprehensive Income: |  |  |  |
Foreign currency translation adjustment | 20,486 | 51,148 | (37,029) | 96,097
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 87,335 | 104,823 | 132,181 | 237,267
Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |
Revenues | 899,994 | 867,973 | 2,703,468 | 2,490,102
Cost of goods sold | 727,052 | 697,896 | 2,189,683 | 2,002,708
Selling, general and administrative expense | 149,390 | 140,638 | 447,437 | 410,624
Depreciation and amortization | 4,475 | 4,475 | 13,749 | 13,811
Income (Loss) from Subsidiaries, before Tax | 61,771 | 42,726 | 158,093 | 117,907
Other Nonoperating Income (Expense) | (13,127) | (25,436) | (41,202) | (74,961)
Provision for income taxes | 1,076 | (136) | 2,201 | (3,034)
Net income (loss) | 66,645 | 42,390 | 167,289 | 108,939
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0 | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 66,645 | 42,390 | 167,289 | 108,939
Comprehensive Income: |  |  |  |
Foreign currency translation adjustment | 20,486 | 51,148 | (37,029) | 96,097
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  | (252)
Comprehensive income attributable to WESCO International, Inc. | 87,131 | 93,538 | 130,260 | 205,288
Consolidation, Eliminations [Member] |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |
Revenues | (38,923) | (37,191) | (116,967) | (97,420)
Cost of goods sold | (38,923) | (37,191) | (116,967) | (97,420)
Selling, general and administrative expense | 0 | 0 | 0 | 0
Depreciation and amortization | 0 | 0 | 0 | 0
Income (Loss) from Subsidiaries, before Tax | (128,416) | (96,302) | (325,382) | (258,822)
Other Nonoperating Income (Expense) | 0 | 0 | 0 | 0
Provision for income taxes | 0 | 0 | 0 | 0
Net income (loss) | (128,416) | (96,302) | (325,382) | (258,822)
Less: Net (loss) income attributable to noncontrolling interest | 0 | 0 | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | (128,416) | (96,302) | (325,382) | (258,822)
Comprehensive Income: |  |  |  |
Foreign currency translation adjustment | (40,972) | (102,296) | 74,058 | (192,194)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  | 504
Comprehensive income attributable to WESCO International, Inc. | (169,388) | (198,598) | (251,324) | (451,520)
Pension Plan [Member] |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |
Other Nonoperating Gains (Losses) | $ (500) | $ (500) | $ (1,400) | $ (1,400)

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