Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Goodwill (Details)

v3.19.2
Acquisitions and Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Apr. 21, 2019
Dec. 31, 2018
Oct. 28, 2018
Jul. 25, 2018
Segment Reporting Information [Line Items]          
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 139,229        
Carrying value of goodwill 218,373   $ 199,092    
FSA [Member]          
Segment Reporting Information [Line Items]          
Business Acquisition, Cash Paid   $ 27,000      
Business Combination, Contingent Consideration, Liability   15,000      
Business Combination, Contingent Consideration, Liability, Current 10,321        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   202      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables   1,491      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   40      
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets   1,733      
Carrying value of goodwill   19,281      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   37,281      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   39,014      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities   7,664      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities   4,350      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   12,014      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   27,000      
MMT [Member]          
Segment Reporting Information [Line Items]          
Business Acquisition, Cash Paid         $ 3,737
Southwest Freight Distributors [Member]          
Segment Reporting Information [Line Items]          
Business Acquisition, Cash Paid       $ 16,250  
Expedited LTL [Member]          
Segment Reporting Information [Line Items]          
Carrying value of goodwill 116,874   97,593    
Intermodal [Member]          
Segment Reporting Information [Line Items]          
Carrying value of goodwill 76,615   76,615    
Truckload Expedited [Member]          
Segment Reporting Information [Line Items]          
Carrying value of goodwill 45,164   45,164    
Goodwill, Impaired, Accumulated Impairment Loss (25,686)   (25,686)    
Pool Distribution [Member]          
Segment Reporting Information [Line Items]          
Carrying value of goodwill 12,359   12,359    
Goodwill, Impaired, Accumulated Impairment Loss $ (6,953)   $ (6,953)    
Noncompete Agreements [Member] | FSA [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   900      
Customer Relationships [Member] | FSA [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   $ 17,100      
Risk Free Interest Rate [Member] | FSA [Member]          
Segment Reporting Information [Line Items]          
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage   2.40%      
Revenue Discount Rate [Member] | FSA [Member]          
Segment Reporting Information [Line Items]          
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage   8.50%      
Revenue Volatility [Member] | FSA [Member]          
Segment Reporting Information [Line Items]          
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage   9.00%