SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 220,706	$ 181,243	$ 119,195	$ 59,178	$ 401,949	$ 178,373
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	50,717,000		50,243,000		50,657,000	50,184,000
Common shares issuable upon exercise of dilutive stock options (in shares)	1,503,000		1,751,000		1,572,000	1,691,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	52,220,000		51,994,000		52,229,000	51,875,000
Diluted (in dollars per share)	$ 3.95		$ 2.02		$ 7.15	$ 2.89
Basic (in dollars per share)	$ 4.07		$ 2.09		$ 7.37	$ 2.98
Net Income (Loss) Available to Common Stockholders, Basic	$ 206,354		$ 104,843		$ 373,245	$ 149,669
Preferred Stock Dividends, Income Statement Impact	$ 14,352		$ 14,352		$ 28,704	$ 28,704