Annual report pursuant to Section 13 and 15(d)

Acquisitions, Goodwill and Other Long-Lived Assets Carrying Value of Goodwill (Details)

v3.6.0.2
Acquisitions, Goodwill and Other Long-Lived Assets Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 105,531    
Goodwill, Net 184,675 $ 205,609  
Goodwill, Acquired During Period 6,282    
Goodwill, Impairment Loss (25,686)    
Goodwill, Purchase Accounting Adjustments (1,530)    
Amortization expense of acquired intangible assets 10,122 10,905 $ 8,517
TQI [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss (25,686)    
Expedited LTL [Member]      
Goodwill [Line Items]      
Goodwill, Net 97,593 99,123  
Goodwill, Purchase Accounting Adjustments (1,530)    
Truckload Premium Services [Member]      
Goodwill [Line Items]      
Goodwill, Net 45,164 45,164  
Accumulated impairment loss (25,686)    
Goodwill, Impairment Loss (25,686)    
Pool Distribution [Member]      
Goodwill [Line Items]      
Goodwill, Net 12,359 12,359  
Accumulated impairment loss (6,953) (6,953)  
Intermodal [Member]      
Goodwill [Line Items]      
Goodwill, Net 62,198 $ 55,916  
Goodwill, Acquired During Period $ 6,282    
Triumph & Ace [Member] | Customer Relationships [Member]      
Goodwill [Line Items]      
Weighted average useful lives of acquired intangible assets 15 years    
Triumph & Ace [Member] | Noncompete Agreements [Member]      
Goodwill [Line Items]      
Weighted average useful lives of acquired intangible assets 5 years