Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Swaps (Details)

v3.7.0.1
Long-Term Debt - Swaps (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 20, 2015
USD ($)
contract
Jun. 30, 2017
USD ($)
item
Jun. 30, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Derivative [Line Items]        
Number of interest rate swap agreements | contract 3      
Inventories - truck chassis floor plan   $ 8,721 $ 8,721 $ 3,939
Bailment pool        
Derivative [Line Items]        
Bailment Pool Chasis Inventories Net   15,228 15,228 22,420
Interest Expense, Debt   43 135  
Senior credit facilities | Floor plan        
Derivative [Line Items]        
Maximum borrowing capacity   20,000 20,000  
Inventories - truck chassis floor plan   8,721 8,721 3,939
Interest Expense, Debt   $ 52 82  
Senior credit facilities | London Interbank Offered Rate (LIBOR) | Floor plan        
Derivative [Line Items]        
Interest rate margin (as a percent)   1.75%    
Minimum | Prime | Bailment pool        
Derivative [Line Items]        
Interest rate margin (as a percent)   0.00%    
Maximum | Prime | Bailment pool        
Derivative [Line Items]        
Interest rate margin (as a percent)   8.00%    
Interest rate swap        
Derivative [Line Items]        
Negative fair value   $ 2,736 $ 2,736 1,985
Number of financial institutions for which the entity is exposed to counterparty credit risk | item   1 1  
Interest rate swap | Accrued Expenses and Other Current Liabilities        
Derivative [Line Items]        
Negative fair value   $ 442 $ 442 335
Interest rate swap | Other Noncurrent Liabilities        
Derivative [Line Items]        
Negative fair value   $ 2,294 $ 2,294 $ 1,650
Interest Rate Swap Effective 31 December 2015 through 29 March 2018        
Derivative [Line Items]        
Notional amount $ 45,000      
Fixed interest rate on derivative (as a percent)   6.105% 6.105%  
Interest Rate Swap Effective 31 December 2015 through 29 March 2018 | London Interbank Offered Rate (LIBOR)        
Derivative [Line Items]        
Interest rate added to variable rate (as a percent)   4.25% 4.25%  
LIBOR floor (as a percent)   1.00% 1.00%  
Interest Rate Swap Effective 29 March 2018 through 31 March 2020        
Derivative [Line Items]        
Notional amount 90,000      
Fixed interest rate on derivative (as a percent)   6.916% 6.916%  
Interest Rate Swap Effective 29 March 2018 through 31 March 2020 | London Interbank Offered Rate (LIBOR)        
Derivative [Line Items]        
Interest rate added to variable rate (as a percent)   4.25% 4.25%  
LIBOR floor (as a percent)   1.00% 1.00%  
Interest Rate Swap Effective 31 March 2020 through 30 June 2021        
Derivative [Line Items]        
Notional amount $ 135,000      
Fixed interest rate on derivative (as a percent)   7.168% 7.168%  
Interest Rate Swap Effective 31 March 2020 through 30 June 2021 | London Interbank Offered Rate (LIBOR)        
Derivative [Line Items]        
Interest rate added to variable rate (as a percent)   4.25% 4.25%  
LIBOR floor (as a percent)   1.00% 1.00%