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SELECTED QUARTERLY FINANCIAL DATA (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



	First Quarter				Second Quarter				Third Quarter				Fourth Quarter
2016
Net Sales	$	1,775,961			$	1,911,582			$	1,855,212			$	1,793,262
Cost of goods sold (excluding depreciation and amortization)	1,420,793				1,532,113				1,490,173				1,444,735
Income from operations	69,508				87,987				92,555				82,009
Income (loss) before income taxes	50,679				68,535				(52,170		)		64,507
Net income (loss)	34,534				49,852				(31,021		)		47,755
Net income (loss) attributable to WESCO International	36,053				49,798				(31,611		)		47,348
Basic earnings (loss) per share attributable to WESCO International, Inc.^{(A) (C)}	0.85				1.18				(0.73		)		0.97
Diluted earnings (loss) per share attributable to WESCO International, Inc.^{(B) (C)}	0.77				1.02				(0.73		)		0.96

2015
Net Sales	$	1,816,330			$	1,916,718			$	1,923,899			$	1,861,540
Cost of goods sold (excluding depreciation and amortization)	1,448,639				1,535,084				1,543,113				1,497,990
Income from operations	87,185				90,253				106,348				89,956
Income before income taxes	66,291				71,640				85,931				80,048
Net income	46,793				50,639				62,384				48,557
Net income attributable to WESCO International	47,031				51,741				63,503				48,412
Basic earnings per share attributable to WESCO International, Inc.^(A)	1.06				1.18				1.47				1.15
Diluted earnings per share attributable to WESCO International, Inc.^(B)	0.90				1.00				1.28				1.03