SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 239,602	$ 220,706	$ 181,243	$ 119,596	$ 119,195	$ 59,178	$ 641,551	$ 297,969
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	50,815,000			50,386,000			50,711,000	50,252,000
Common shares issuable upon exercise of dilutive stock options (in shares)	1,574,000			1,677,000			1,675,000	1,644,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	52,389,000			52,063,000			52,386,000	51,896,000
Diluted (in dollars per share)	$ 4.30			$ 2.02			$ 11.42	$ 4.91
Basic (in dollars per share)	$ 4.43			$ 2.09			$ 11.80	$ 5.07
Net Income (Loss) Available to Common Stockholders, Basic	$ 225,250			$ 105,244			$ 598,495	$ 254,913
Preferred Stock Dividends, Income Statement Impact	$ 14,352			$ 14,352			$ 43,056	$ 43,056