CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 236,792	$ 212,583
Accounts Receivable, after Allowance for Credit Loss, Current	3,635,840	2,957,613
Accounts and Other Receivables, Net, Current	390,954	375,885
Inventories, net	3,165,828	2,666,219
Prepaid expenses and other current assets	177,061	137,811
Assets, Current	7,606,475	6,350,111
Property, buildings and equipment, net of accumulated depreciation of $229,041 and $213,758 in 2014 and 2013, respectively	370,452	379,012
Operating Lease, Right-of-Use Asset	570,062	530,863
Intangible assets, net	1,888,911	1,944,141
Goodwill	3,190,677	3,208,333
Other assets	236,689	205,239
Assets	13,863,266	12,617,699
Accounts payable	2,652,306	2,140,251
Accrued payroll and benefit costs	210,090	314,962
Current portion of long-term debt	70,628	9,528
Other Liabilities, Current	659,810	585,067
Liabilities, Current	3,592,834	3,049,808
Total long-term debt	5,039,857	4,701,542
Operating Lease, Liability, Noncurrent	449,684	414,248
Deferred Income Tax Liabilities, Net	439,475	437,444
Other Liabilities, Noncurrent	230,109	238,446
Liabilities	9,751,959	8,841,488
Commitments and Contingencies
Additional capital	1,985,967	1,969,332
Retained earnings	$ 3,370,936	$ 3,004,690
Treasury stock, shares (in shares)	22,030,081	22,026,922
Treasury stock, at cost; 22,030,081 and 22,026,922 shares in 2022 and 2021, respectively	$ (957,083)	$ (956,188)
Accumulated other comprehensive income	(283,768)	(236,035)
Total WESCO International, Inc. stockholders' equity	4,116,789	3,782,524
Noncontrolling interest	(5,482)	(6,313)
Total stockholders’ equity	4,111,307	3,776,211
Liabilities and Equity	$ 13,863,266	$ 12,617,699
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	25,000
Preferred stock, shares outstanding (in shares)	21,612
Preferred stock, shares issued (in shares)	21,612	21,612
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	210,000,000	210,000,000
Common stock, shares, issued (in shares)	68,409,001	68,162,297
Common stock, shares outstanding (in shares)	50,718,351	50,474,806
Common stock	$ 694	$ 682
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares, issued (in shares)	4,339,431	4,339,431
Common stock, shares outstanding (in shares)	0	0
Common stock	$ 43	$ 43