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CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Financial Information [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,148,110 |  |  | $ 2,067,245 |  |  | $ 6,259,465 | $ 6,165,154
Cost of goods sold | 1,747,913 |  |  | 1,670,037 |  |  | 5,067,799 | 4,988,103
Selling, general and administrative expense | 290,852 |  |  | 284,073 |  |  | 883,222 | 867,790
Depreciation and amortization | 15,612 |  |  | 15,618 |  |  | 46,035 | 47,321
Provision for income taxes | 15,886 |  |  | 13,822 |  |  | 44,970 | 40,077
Net income (loss) | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Less: Net (loss) income attributable to noncontrolling interest | (156) |  |  | (204) |  |  | (824) | (1,921)
Net income (loss) attributable to WESCO International, Inc. | 64,495 | $ 63,464 | $ 42,369 | 66,849 | $ 57,940 | $ 44,421 | 170,329 | 169,210
Comprehensive Income: |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (16,856) |  |  | 20,486 |  |  | 25,905 | (37,029)
Comprehensive income attributable to WESCO International, Inc. | 47,639 |  |  | 87,335 |  |  | 196,234 | 132,181
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 | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Other Nonoperating Income (Expense) | 0 |  |  | 0 |  |  | 0 | 0
Provision for income taxes | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Less: Net (loss) income attributable to noncontrolling interest | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Comprehensive Income: |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (16,856) |  |  | 20,486 |  |  | 25,905 | (37,029)
Comprehensive income attributable to WESCO International, Inc. | 47,483 |  |  | 87,131 |  |  | 195,410 | 130,260
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 1,244,847 |  |  | 1,206,174 |  |  | 3,643,193 | 3,578,653
Cost of goods sold | 1,016,359 |  |  | 981,908 |  |  | 2,966,959 | 2,915,387
Selling, general and administrative expense | 143,927 |  |  | 134,683 |  |  | 437,735 | 420,353
Depreciation and amortization | 10,778 |  |  | 11,143 |  |  | 32,174 | 33,572
Income (Loss) from Subsidiaries, before Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Nonoperating Income (Expense) | 564 |  |  | 3,923 |  |  | 10,078 | 13,372
Provision for income taxes | 14,494 |  |  | 12,746 |  |  | 41,147 | 37,876
Net income (loss) | 58,725 |  |  | 61,771 |  |  | 155,100 | 158,093
Less: Net (loss) income attributable to noncontrolling interest | (156) |  |  | (204) |  |  | (824) | (1,921)
Net income (loss) attributable to WESCO International, Inc. | 58,881 |  |  | 61,975 |  |  | 155,924 | 160,014
Comprehensive Income: |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (16,856) |  |  | 20,486 |  |  | 25,905 | (37,029)
Comprehensive income attributable to WESCO International, Inc. | 42,025 |  |  | 82,461 |  |  | 181,829 | 122,985
Consolidated Entities [Member] |  |  |  |  |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 2,148,110 |  |  | 2,067,245 |  |  | 6,259,465 | 6,165,154
Cost of goods sold | 1,747,913 |  |  | 1,670,037 |  |  | 5,067,799 | 4,988,103
Selling, general and administrative expense | 290,852 |  |  | 284,073 |  |  | 883,222 | 867,790
Depreciation and amortization | 15,612 |  |  | 15,618 |  |  | 46,035 | 47,321
Income (Loss) from Subsidiaries, before Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Nonoperating Income (Expense) | (13,508) |  |  | (17,050) |  |  | (47,934) | (54,574)
Provision for income taxes | 15,886 |  |  | 13,822 |  |  | 44,970 | 40,077
Net income (loss) | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Less: Net (loss) income attributable to noncontrolling interest | (156) |  |  | (204) |  |  | (824) | (1,921)
Net income (loss) attributable to WESCO International, Inc. | 64,495 |  |  | 66,849 |  |  | 170,329 | 169,210
Comprehensive Income: |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (16,856) |  |  | 20,486 |  |  | 25,905 | (37,029)
Comprehensive income attributable to WESCO International, Inc. | 47,639 |  |  | 87,335 |  |  | 196,234 | 132,181
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 939,909 |  |  | 899,994 |  |  | 2,736,224 | 2,703,468
Cost of goods sold | 768,200 |  |  | 727,052 |  |  | 2,220,792 | 2,189,683
Selling, general and administrative expense | 146,925 |  |  | 149,390 |  |  | 445,487 | 447,437
Depreciation and amortization | 4,834 |  |  | 4,475 |  |  | 13,861 | 13,749
Income (Loss) from Subsidiaries, before Tax | 58,725 |  |  | 61,771 |  |  | 155,100 | 158,093
Other Nonoperating Income (Expense) | (12,944) |  |  | (13,127) |  |  | (37,856) | (41,202)
Provision for income taxes | 1,392 |  |  | 1,076 |  |  | 3,823 | 2,201
Net income (loss) | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Less: Net (loss) income attributable to noncontrolling interest | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | 64,339 |  |  | 66,645 |  |  | 169,505 | 167,289
Comprehensive Income: |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (16,856) |  |  | 20,486 |  |  | 25,905 | (37,029)
Comprehensive income attributable to WESCO International, Inc. | 47,483 |  |  | 87,131 |  |  | 195,410 | 130,260
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |  |  |  |  |
Revenues | (36,646) |  |  | (38,923) |  |  | (119,952) | (116,967)
Cost of goods sold | (36,646) |  |  | (38,923) |  |  | (119,952) | (116,967)
Selling, general and administrative expense | 0 |  |  | 0 |  |  | 0 | 0
Depreciation and amortization | 0 |  |  | 0 |  |  | 0 | 0
Income (Loss) from Subsidiaries, before Tax | (123,064) |  |  | (128,416) |  |  | (324,605) | (325,382)
Other Nonoperating Income (Expense) | 0 |  |  | 0 |  |  | 0 | 0
Provision for income taxes | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) | (123,064) |  |  | (128,416) |  |  | (324,605) | (325,382)
Less: Net (loss) income attributable to noncontrolling interest | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) attributable to WESCO International, Inc. | (123,064) |  |  | (128,416) |  |  | (324,605) | (325,382)
Comprehensive Income: |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 33,712 |  |  | (40,972) |  |  | (51,810) | 74,058
Comprehensive income attributable to WESCO International, Inc. | (89,352) |  |  | (169,388) |  |  | (376,415) | (251,324)
Pension Plan [Member] |  |  |  |  |  |  |  |
Condensed Financial Information [Line Items] |  |  |  |  |  |  |  |
Other Nonoperating Gains (Losses) | $ (400) |  |  | $ (500) |  |  | $ (1,000) | $ (1,400)

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Namespace Prefix: | wcc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_NonGuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_ConsolidatedEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_GuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=srt_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |