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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues $ 2,011,447 $ 2,067,245 $ 2,103,994 $ 1,993,915 $ 1,996,647 $ 2,000,159 $ 1,909,624 $ 1,772,591 $ 8,176,601 $ 7,679,021 $ 7,336,017
Cost of goods sold (excluding depreciation and amortization below) 1,621,117 1,670,037 1,704,100 1,613,966 1,613,469 1,614,814 1,543,510 1,422,573 6,609,220 6,194,366 5,887,814
Selling, general and administrative expense                 1,151,944 1,101,598 1,050,799
Depreciation and amortization                 62,997 64,017 66,858
Revenue from Contract with Customer, Excluding Assessed Tax                 8,176,601 7,679,021 7,336,017
Income from operations 90,499 97,517 91,183 73,241 81,446 89,250 83,105 67,089 352,440 319,040 330,546
Other Nonoperating Income (Expense)                 (71,415) (66,600) (75,062)
Gain (Loss) on Extinguishment of Debt                 0 0 (123,933)
Income before income taxes 73,658 80,467 73,442 53,458 63,844 71,939 66,289 50,368 281,025 252,440 131,551
Provision for income taxes                 55,670 89,307 30,431
Net income 58,066 66,645 57,673 42,971 22,222 53,576 49,535 37,800 225,355 163,133 101,120
Net loss attributable to noncontrolling interest                 (1,988) (327) (468)
Net Income attributable to WESCO International, Inc. $ 58,133 $ 66,849 $ 57,940 $ 44,421 $ 22,546 $ 53,675 $ 49,510 $ 37,729 227,343 163,460 101,588
Comprehensive Income:                      
Foreign currency translation adjustment                 (99,643) 85,762 38,275
Benefit plan adjustments                 3,798 (6,381) (2,485)
Comprehensive income attributable to WESCO International, Inc.                 $ 131,498 $ 242,841 $ 137,378
Earnings per share :                      
Basic $ 1.27 $ 1.42 $ 1.23 $ 0.94 $ 0.48 $ 1.13 $ 1.03 $ 0.77 $ 4.87 $ 3.42 $ 2.30
Diluted $ 1.26 $ 1.41 $ 1.22 $ 0.93 $ 0.47 $ 1.12 $ 1.02 $ 0.76 $ 4.82 $ 3.38 $ 2.10
Service [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 $ 23,300 $ 26,200 $ 27,100
Shipping and Handling [Member]                      
Cost of goods sold (excluding depreciation and amortization below)                 $ 74,100 $ 61,800 $ 57,900