Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Goodwill (Details)

v3.8.0.1
Acquisitions and Goodwill (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 07, 2017
USD ($)
Aug. 29, 2016
USD ($)
Jan. 25, 2016
USD ($)
Mar. 09, 2015
USD ($)
Segment Reporting Information [Line Items]                  
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 112,391     $ 112,391          
Carrying value of goodwill 191,535     191,535 $ 184,675        
Goodwill, Acquired During Period       $ 6,860          
Impairment of Intangible Assets, Finite-lived     $ 16,501            
Escrow Reimbursements Received   $ 2,525              
Recovery of Direct Costs   1,621              
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments   $ 904              
Number of Reporting Units       5          
Atlantic [Member]                  
Segment Reporting Information [Line Items]                  
Business Acquisition, Cash Paid           $ 22,500      
Business Combination, Contingent Consideration, Liability           1,000      
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period         62,300        
Operating Revenue Since Acquisition Date 14,745                
Carrying value of goodwill           6,860      
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           21,410      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           23,231      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other           590      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation           141      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities           731      
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets           22,500      
Business Combination, Pro Forma Information, Operating Income of Acquiree since Acquisition Date, Actual 1,119                
Towne [Member]                  
Segment Reporting Information [Line Items]                  
Escrow Deposit                 $ 16,500
Triumph & Ace [Member]                  
Segment Reporting Information [Line Items]                  
Carrying value of goodwill             $ 6,282    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment             1,294    
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets             1,294    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles             11,756    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets             13,050    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other             1,250    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities             1,250    
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets             11,800    
Triumph [Member]                  
Segment Reporting Information [Line Items]                  
Business Acquisition, Cash Paid             10,100    
Business Combination, Contingent Consideration, Liability             1,250    
Expedited LTL [Member]                  
Segment Reporting Information [Line Items]                  
Carrying value of goodwill 97,593     $ 97,593 97,593        
Truckload Expedited [Member]                  
Segment Reporting Information [Line Items]                  
Carrying value of goodwill 45,164     45,164 45,164        
Goodwill, Impaired, Accumulated Impairment Loss (25,686)     (25,686) (25,686)        
Other Asset Impairment Charges     $ 255            
Pool Distribution [Member]                  
Segment Reporting Information [Line Items]                  
Carrying value of goodwill 12,359     12,359 12,359        
Goodwill, Impaired, Accumulated Impairment Loss (6,953)     (6,953) (6,953)        
Intermodal [Member]                  
Segment Reporting Information [Line Items]                  
Carrying value of goodwill $ 69,058     69,058 $ 62,198        
Goodwill, Acquired During Period       $ 6,860          
Ace [Member]                  
Segment Reporting Information [Line Items]                  
Business Acquisition, Cash Paid               $ 1,700  
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] | Triumph & Ace [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             139    
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] | Triumph & Ace [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             $ 5,335