Annual report pursuant to Section 13 and 15(d)

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

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Acquisitions, Goodwill and Other Long-Lived Assets Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]      
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 99,248    
Goodwill, Acquired During Period 61,197    
Goodwill, Net 205,609 $ 144,412  
Amortization expense of acquired intangible assets 10,905 8,517 $ 5,762
FASI [Member]      
Goodwill [Line Items]      
Accumulated impairment loss (6,953) (6,953)  
Goodwill, Net 12,359 12,359  
TQI [Member]      
Goodwill [Line Items]      
Goodwill, Net $ 45,164 45,164  
TQI [Member] | Customer Relationships [Member]      
Goodwill [Line Items]      
Weighted average useful lives of acquired intangible assets 15 years    
TQI [Member] | Noncompete Agreements [Member]      
Goodwill [Line Items]      
Weighted average useful lives of acquired intangible assets 5 years    
TQI [Member] | Trade Names [Member]      
Goodwill [Line Items]      
Weighted average useful lives of acquired intangible assets 5 years    
Forward Air [Member]      
Goodwill [Line Items]      
Goodwill, Acquired During Period $ 61,197    
Goodwill, Net $ 155,039 $ 93,842