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ACCOUNTING POLICIES ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Quantifying Prior Year Misstatements Corrected in Current Year Financial Statements [Table Text Block]
The following table presents the effects on the financial statement line items that were revised:
 
December 31, 2016
 
As
Reported
 
Adjustment
 
As
Revised
 
(In thousands)
Income taxes receivable
$
72,881

 
$
(67,156
)
 
$
5,725

Prepaid expenses and other current assets

48,583

 
(2,223
)
 
46,360

Total current assets
2,172,457

 
(69,379
)
 
2,103,078

Goodwill
1,720,714

 
10,236

 
1,730,950

Total assets
4,490,984

 
(59,143
)
 
4,431,841

Income taxes payable
32,879

 
(22,998
)
 
9,881

Total current liabilities
896,797

 
(22,998
)
 
873,799

Deferred income taxes
158,009

 
10,236

 
168,245

Total liabilities
2,480,972

 
(12,762
)
 
2,468,210

Retained earnings (1)
1,956,532

 
(41,775
)
 
1,914,757

Accumulated other comprehensive loss (1)
(387,365
)
 
(4,606
)
 
(391,971
)
Total WESCO International, Inc. stockholders' equity
2,013,281

 
(46,381
)
 
1,966,900

Total stockholders' equity
2,010,012

 
(46,381
)
 
1,963,631

Total liabilities and stockholders' equity
4,490,984

 
(59,143
)
 
4,431,841

(1)
These financial statement line items have been revised as of December 31, 2015 and 2014 in the Consolidated Statements of Stockholders' Equity for the years ended December 31, 2017, 2016 and 2015.