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SELECTED QUARTERLY FINANCIAL DATA (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
Net Sales
$
1,772,591

 
$
1,909,624

 
$
2,000,159

 
$
1,996,647

Cost of goods sold (excluding depreciation and amortization)
1,422,573

 
1,543,510

 
1,614,814

 
1,613,469

Income from operations
67,089

 
83,105

 
89,250

 
81,446

Income before income taxes
50,368

 
66,289

 
71,939

 
63,844

Net income (1)
37,800

 
49,535

 
53,576

 
22,222

  Net income attributable to WESCO International (1)
37,729

 
49,510

 
53,675

 
22,546

Basic earnings per share attributable to WESCO International (1) (2)
0.77

 
1.03

 
1.13

 
0.48

Diluted earnings per share attributable to WESCO International (1) (3)
0.76

 
1.02

 
1.12

 
0.47

 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
Net Sales
$
1,775,961

 
$
1,911,582

 
$
1,855,212

 
$
1,793,262

Cost of goods sold (excluding depreciation and amortization)
1,420,793

 
1,532,113

 
1,490,173

 
1,444,735

Income from operations
69,508

 
87,987

 
92,555

 
82,009

Income (loss) before income taxes
50,679

 
68,535

 
(52,170
)
 
64,507

Net income (loss)
34,534

 
49,852

 
(31,021
)
 
47,755

  Net income (loss) attributable to WESCO International
36,053

 
49,798

 
(31,611
)
 
47,348

Basic earnings (loss) per share attributable to WESCO International (2) (4)
0.85

 
1.18

 
(0.73
)
 
0.97

Diluted earnings (loss) per share attributable to WESCO International (3) (4)
0.77

 
1.02

 
(0.73
)
 
0.96