Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Goodwill (Details)

v3.8.0.1
Acquisitions and Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Oct. 22, 2017
May 07, 2017
Segment Reporting Information [Line Items]        
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 112,527      
Carrying value of goodwill 191,671 $ 191,671    
Atlantic [Member]        
Segment Reporting Information [Line Items]        
Business Acquisition, Cash Paid       $ 22,500
Business Combination, Contingent Consideration, Liability       1,000
Carrying value of goodwill       6,719
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       1,821
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets       1,821
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       21,269
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       23,090
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities     $ 100 590
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     100 590
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets     640 22,500
Expedited LTL [Member]        
Segment Reporting Information [Line Items]        
Carrying value of goodwill 97,593      
Truckload Expedited [Member]        
Segment Reporting Information [Line Items]        
Carrying value of goodwill 45,164      
Goodwill, Impaired, Accumulated Impairment Loss (25,686)      
Pool Distribution [Member]        
Segment Reporting Information [Line Items]        
Carrying value of goodwill 12,359      
Goodwill, Impaired, Accumulated Impairment Loss (6,953)      
Intermodal [Member]        
Segment Reporting Information [Line Items]        
Carrying value of goodwill $ 69,194      
KCL [Member]        
Segment Reporting Information [Line Items]        
Business Combination, Contingent Consideration, Liability     100  
Carrying value of goodwill     277  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     223  
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets     223  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     517  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     740  
Noncompete Agreements [Member] | Atlantic [Member]        
Segment Reporting Information [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       1,150
Noncompete Agreements [Member] | KCL [Member]        
Segment Reporting Information [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 years      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     6  
Customer Relationships [Member] | Atlantic [Member]        
Segment Reporting Information [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       $ 13,400
Customer Relationships [Member] | KCL [Member]        
Segment Reporting Information [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 234