EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Year Ended December 31,
	2019		2018		2017
(In thousands, except per share data)
Net income attributable to WESCO International	$	223,426	$	227,343	$	163,460
Weighted-average common shares outstanding used in computing basic earnings per share	43,104		46,722		47,849
Common shares issuable upon exercise of dilutive equity awards	383		477		512
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	43,487		47,199		48,361
Earnings per share attributable to WESCO International
Basic	$	5.18	$	4.87	$	3.42
Diluted	$	5.14	$	4.82	$	3.38