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ACQUISITIONS - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Sep. 30, 2016
Jan. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Purchase consideration, net of cash acquired       $ 49,068 $ 220,203 $ 369,833
Goodwill recorded in acquisition       28,591 $ 132,797  
Milgram & Company Ltd.            
Business Acquisition [Line Items]            
Purchase consideration, net of cash acquired $ 47,300          
Goodwill recorded in acquisition       $ 28,600    
APC Logistics            
Business Acquisition [Line Items]            
Payments to acquire business   $ 229,400        
Freightquote            
Business Acquisition [Line Items]            
Payments to acquire business     $ 398,600      
Freightquote | Trademarks            
Business Acquisition [Line Items]            
Indefinite-lived intangible assets acquired     $ 8,600