Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Summary (Details)

v3.8.0.1
Long-Term Debt - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 17, 2017
Feb. 08, 2017
Dec. 31, 2017
Dec. 31, 2016
Jul. 15, 2016
Dec. 31, 2015
Dec. 31, 2014
Long-term debt              
Less current maturities     $ 32,749 $ 2,829      
Long-term debt, less current maturities     274,872 306,726      
Deferred financing costs, net     3,209 4,033   $ 2,337 $ 2,485
Total long-term debt     274,872 306,726      
Long-term debt, additional disclosure              
Financing costs     1,608 2,320      
Inventories - truck chassis floor plan     7,711 3,939      
Term loan facility              
Long-term debt              
Notes and Loans Payable, Current, Total     310,830 313,588      
Less current maturities     32,749 2,829      
Long-term debt, less current maturities     278,081 $ 310,759      
Total long-term debt     310,830        
Schedule of maturities on long-term debt              
2018     32,749        
2019     2,749        
2020     2,749        
2021     272,583        
Long-term debt, additional disclosure              
Incremental term loan     $ 10,000        
Actual interest rate (as a percent)     4.70% 5.25%      
Unamortized discount on issuance of debt     $ 1,562 $ 1,953      
Financing costs       2,120      
Revolving credit facility              
Long-term debt, additional disclosure              
Financing costs       200      
Incremental Term Loan Facility              
Long-term debt, additional disclosure              
Unamortized discount on issuance of debt       $ 650      
Senior credit facilities              
Long-term debt, additional disclosure              
Floor plan financing arrangements         $ 20,000    
Remaining borrowing availability     $ 99,463        
Percentage of net cash proceeds of certain asset sales, certain insurance or condemnation events, requirement for additional principal prepayments     100.00%        
Percentage of excess cash flow paid as additional principal prepayments     50.00%        
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, one     0.00%        
Senior credit facilities | Maximum              
Long-term debt, additional disclosure              
Period before end of the fiscal year, for additional principal prepayments of debt, from excess cash flow     150 days        
Senior credit facilities | Term loan facility              
Long-term debt, additional disclosure              
Maximum borrowing capacity     $ 190,000        
Borrowings under senior credit facility $ 313,962 $ 315,540 313,962   $ 130,000    
Excess cash flow payment     11,279        
Voluntary payment     18,721        
Senior credit facilities | Term loan facility | Maximum              
Long-term debt, additional disclosure              
Additional term loan commitments     $ 80,000        
Debt ratio     3.25        
Senior credit facilities | Term loan facility | ABR              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)   3.25%          
Senior credit facilities | Term loan facility | ABR | Maximum              
Long-term debt, additional disclosure              
Interest rate margin (as a percent) 2.00%            
Senior credit facilities | Term loan facility | ABR | Minimum              
Long-term debt, additional disclosure              
Interest rate margin (as a percent) 2.50%            
Senior credit facilities | Term loan facility | Euro dollar              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)   4.25%          
Senior credit facilities | Term loan facility | Euro dollar | Maximum              
Long-term debt, additional disclosure              
Interest rate margin (as a percent) 3.00%            
Senior credit facilities | Term loan facility | Euro dollar | Minimum              
Long-term debt, additional disclosure              
Interest rate margin (as a percent) 3.50%            
Senior credit facilities | Term loan facility | First option | Minimum              
Long-term debt, additional disclosure              
Additional interest margin added to fixed and variable rates (as a percent)     1.00%        
Additional fixed interest rate spread (as a percent)     1.00%        
Senior credit facilities | Term loan facility | First option | Federal funds              
Long-term debt, additional disclosure              
Variable rate basis description     Federal funds        
Interest rate margin (as a percent)     0.50%        
Senior credit facilities | Term loan facility | First option | Fixed rate              
Long-term debt, additional disclosure              
Fixed interest rate base (as a percent)     2.00%        
Senior credit facilities | Term loan facility | First option | One month London Interbank Offered Rate              
Long-term debt, additional disclosure              
Variable rate basis description     LIBOR for a one month interest period        
Senior credit facilities | Term loan facility | First option | Prime              
Long-term debt, additional disclosure              
Variable rate basis description     Prime Rate        
Senior credit facilities | Term loan facility | Second option | Fixed rate              
Long-term debt, additional disclosure              
Fixed interest rate base (as a percent)     3.00%        
Additional fixed interest rate spread (as a percent)     1.00%        
Senior credit facilities | Revolving credit facility | Second option | Federal funds              
Long-term debt, additional disclosure              
Variable rate basis description     federal funds        
Senior credit facilities | Revolving credit facility | Second option | One month London Interbank Offered Rate              
Long-term debt, additional disclosure              
Variable rate basis description     LIBOR for a one month interest period        
Senior credit facilities | Revolving credit facility | Second option | Prime              
Long-term debt, additional disclosure              
Variable rate basis description     Prime Rate        
Senior credit facilities | Amended term loan facility | ABR              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)   2.50%          
Senior credit facilities | Amended term loan facility | Euro dollar              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)   3.50%          
Letter of Credit              
Long-term debt, additional disclosure              
Maximum borrowing capacity     $ 10,000        
Revolving credit facility              
Long-term debt              
Total long-term debt     0        
Long-term debt, additional disclosure              
Maximum borrowing capacity     100,000        
Annual acquisitions allowed     $ 12,500        
Fixed charge coverage ratio to be maintained if certain minimum availability under the credit facility is not maintained.     1        
Revolving credit facility | Maximum              
Long-term debt, additional disclosure              
Facilities consolidation expenditure allowed     $ 15,000        
Revolving credit facility | First option | Fixed rate | Maximum              
Long-term debt, additional disclosure              
Fixed interest rate base (as a percent)     2.00%        
Revolving credit facility | First option | Fixed rate | Minimum              
Long-term debt, additional disclosure              
Fixed interest rate base (as a percent)     1.50%        
Revolving credit facility | Second option | Federal funds              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)     0.50%        
Revolving credit facility | Second option | Federal funds | Maximum              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)     1.00%        
Revolving credit facility | Second option | Federal funds | Minimum              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)     0.50%        
Revolving credit facility | Second option | One month London Interbank Offered Rate              
Long-term debt, additional disclosure              
Interest rate margin (as a percent)     1.00%        
Swingline loan              
Long-term debt, additional disclosure              
Maximum borrowing capacity     $ 5,000        
Prior To Amendment | Senior credit facilities | Term loan facility              
Long-term debt, additional disclosure              
Borrowings under senior credit facility     100,000        
Incremental term loan     $ 5,000