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OTHER FINANCIAL INFORMATION - CONDENSED CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Financial Information |  |  |  |
Cash and cash equivalents | $ 117,953 | $ 110,131 | $ 160,279 | $ 128,319
Trade accounts receivable | 1,170,080 | 1,034,402 |  |
Inventories, net | 956,148 | 821,441 |  |
Prepaid Expense and Other Assets, Current | 40,189 | 46,360 |  |
Total current assets | 2,408,849 | 2,103,078 |  |
Property, building and equipment, net | 156,445 | 157,607 |  |
Intangible assets, net | 367,104 | 393,362 |  |
Goodwill and other intangibles, net | 1,771,877 | 1,730,950 | 1,681,662 |
Other assets | 6,990 | 31,041 |  |
Total assets | 4,735,468 | 4,431,841 |  |
Accounts payable | 799,520 | 684,721 |  |
Short-term debt | 34,075 | 20,920 |  |
Other Liabilities, Current | 86,108 | 78,425 |  |
Total current liabilities | 1,040,969 | 873,799 |  |
Long-term debt | 1,313,261 | 1,363,135 |  |
Long-term Debt, Excluding Current Maturities | 1,313,261 | 1,363,135 |  |
Total WESCO International stockholders' equity | 2,116,143 | 1,963,631 |  |
Stockholders' Equity Attributable to Parent | 2,119,739 | 1,966,900 |  |
Noncontrolling interest | (3,596) | (3,269) |  | (487)
Total liabilities and stockholders' equity | 4,735,468 | 4,431,841 |  |
Parent Company |  |  |  |
Condensed Financial Information |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Trade accounts receivable | 0 | 0 |  |
Inventories, net | 0 | 0 |  |
Prepaid Expense and Other Assets, Current | 4,730 | 13,647 |  |
Total current assets | 4,730 | 13,647 |  |
Intercompany receivables, net | 0 | 0 |  |
Property, building and equipment, net | 0 | 0 |  |
Intangible assets, net | 0 | 0 |  |
Goodwill and other intangibles, net | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 3,058,613 | 3,538,476 |  |
Other assets | 0 | 0 |  |
Total assets | 3,063,343 | 3,552,123 |  |
Accounts payable | 0 | 0 |  |
Short-term debt | 0 | 0 |  |
Other Liabilities, Current | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany payables, net | 939,784 | 1,572,486 |  |
Long-term Debt, Excluding Current Maturities | 0 | 0 |  |
Liabilities, Other than Long-term Debt, Noncurrent | 3,820 | 12,737 |  |
Stockholders' Equity Attributable to Parent | 2,119,739 | 1,966,900 |  |
Noncontrolling interest | 0 | 0 |  |
Total liabilities and stockholders' equity | 3,063,343 | 3,552,123 |  |
Guarantor Subsidiaries |  |  |  |
Condensed Financial Information |  |  |  |
Cash and cash equivalents | 50,602 | 41,552 | 38,963 | 32,508
Trade accounts receivable | 0 | 0 |  |
Inventories, net | 430,092 | 364,562 |  |
Prepaid Expense and Other Assets, Current | 42,547 | 34,833 |  |
Total current assets | 523,241 | 440,947 |  |
Intercompany receivables, net | 0 | 0 |  |
Property, building and equipment, net | 50,198 | 51,824 |  |
Intangible assets, net | 2,770 | 3,417 |  |
Goodwill and other intangibles, net | 257,623 | 257,623 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 5,023,826 | 4,028,502 |  |
Other assets | 2,778 | 23,846 |  |
Total assets | 5,860,436 | 4,806,159 |  |
Accounts payable | 417,690 | 381,795 |  |
Short-term debt | 0 | 0 |  |
Other Liabilities, Current | 80,039 | 120,299 |  |
Total current liabilities | 497,729 | 502,094 |  |
Intercompany payables, net | 1,249,352 | 487,850 |  |
Long-term Debt, Excluding Current Maturities | 934,033 | 983,449 |  |
Liabilities, Other than Long-term Debt, Noncurrent | 120,709 | 55,898 |  |
Stockholders' Equity Attributable to Parent | 3,058,613 | 2,776,868 |  |
Noncontrolling interest | 0 | 0 |  |
Total liabilities and stockholders' equity | 5,860,436 | 4,806,159 |  |
Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Information |  |  |  |
Cash and cash equivalents | 67,351 | 68,579 | 121,316 | 95,811
Trade accounts receivable | 1,170,080 | 1,034,402 |  |
Inventories, net | 526,056 | 456,879 |  |
Prepaid Expense and Other Assets, Current | 152,531 | 211,637 |  |
Total current assets | 1,916,018 | 1,771,497 |  |
Intercompany receivables, net | 2,189,136 | 2,060,336 |  |
Property, building and equipment, net | 106,247 | 105,783 |  |
Intangible assets, net | 364,334 | 389,945 |  |
Goodwill and other intangibles, net | 1,514,254 | 1,473,327 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Other assets | 28,415 | 22,998 |  |
Total assets | 6,118,404 | 5,823,886 |  |
Accounts payable | 381,830 | 302,926 |  |
Short-term debt | 34,075 | 20,920 |  |
Other Liabilities, Current | 162,475 | 170,872 |  |
Total current liabilities | 578,380 | 494,718 |  |
Intercompany payables, net | 0 | 0 |  |
Long-term Debt, Excluding Current Maturities | 379,228 | 379,686 |  |
Liabilities, Other than Long-term Debt, Noncurrent | 140,566 | 162,641 |  |
Stockholders' Equity Attributable to Parent | 5,023,826 | 4,790,110 |  |
Noncontrolling interest | (3,596) | (3,269) |  |
Total liabilities and stockholders' equity | 6,118,404 | 5,823,886 |  |
Consolidated Entities [Member] |  |  |  |
Condensed Financial Information |  |  |  |
Cash and cash equivalents | 117,953 | 110,131 | 160,279 | 128,319
Trade accounts receivable | 1,170,080 | 1,034,402 |  |
Inventories, net | 956,148 | 821,441 |  |
Prepaid Expense and Other Assets, Current | 164,668 | 137,104 |  |
Total current assets | 2,408,849 | 2,103,078 |  |
Intercompany receivables, net | 0 | 0 |  |
Property, building and equipment, net | 156,445 | 157,607 |  |
Intangible assets, net | 367,104 | 393,362 |  |
Goodwill and other intangibles, net | 1,771,877 | 1,730,950 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Other assets | 31,193 | 46,844 |  |
Total assets | 4,735,468 | 4,431,841 |  |
Accounts payable | 799,520 | 684,721 |  |
Short-term debt | 34,075 | 20,920 |  |
Other Liabilities, Current | 207,374 | 168,158 |  |
Total current liabilities | 1,040,969 | 873,799 |  |
Intercompany payables, net | 0 | 0 |  |
Long-term Debt, Excluding Current Maturities | 1,313,261 | 1,363,135 |  |
Liabilities, Other than Long-term Debt, Noncurrent | 265,095 | 231,276 |  |
Stockholders' Equity Attributable to Parent | 2,119,739 | 1,966,900 |  |
Noncontrolling interest | (3,596) | (3,269) |  |
Total liabilities and stockholders' equity | 4,735,468 | 4,431,841 |  |
Consolidation, Eliminations |  |  |  |
Condensed Financial Information |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Trade accounts receivable | 0 | 0 |  |
Inventories, net | 0 | 0 |  |
Prepaid Expense and Other Assets, Current | (35,140) | (123,013) |  |
Total current assets | (35,140) | (123,013) |  |
Intercompany receivables, net | (2,189,136) | (2,060,336) |  |
Property, building and equipment, net | 0 | 0 |  |
Intangible assets, net | 0 | 0 |  |
Goodwill and other intangibles, net | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | (8,082,439) | (7,566,978) |  |
Other assets | 0 | 0 |  |
Total assets | (10,306,715) | (9,750,327) |  |
Accounts payable | 0 | 0 |  |
Short-term debt | 0 | 0 |  |
Other Liabilities, Current | (35,140) | (123,013) |  |
Total current liabilities | (35,140) | (123,013) |  |
Intercompany payables, net | (2,189,136) | (2,060,336) |  |
Long-term Debt, Excluding Current Maturities | 0 | 0 |  |
Liabilities, Other than Long-term Debt, Noncurrent | 0 | 0 |  |
Stockholders' Equity Attributable to Parent | (8,082,439) | (7,566,978) |  |
Noncontrolling interest | 0 | 0 |  |
Total liabilities and stockholders' equity | $ (10,306,715) | $ (9,750,327) |  |

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