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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
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 from operations	73,241	66,634
Nonoperating Income (Expense)	(19,783)	(16,266)
Income before income taxes	53,458	50,368
Provision for income taxes	10,487	12,568
Net income	42,971	37,800
Net (loss) income attributable to noncontrolling interest	(1,450)	71
Net income 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
Earnings per share attributable to WESCO International, Inc.
Basic (in dollars per share)	$ 0.94	$ 0.77
Diluted (in dollars per share)	$ 0.93	$ 0.76

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