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
Feb. 20, 2015
USD ($)
contract
Mar. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Derivative [Line Items]      
Number of interest rate swap agreements | contract 3    
Inventories - truck chassis floor plan   $ 6,938 $ 3,939
Bailment pool      
Derivative [Line Items]      
Bailment Pool Chasis Inventories Net   19,994 22,420
Interest Expense, Debt   92  
Senior credit facilities | Floor plan      
Derivative [Line Items]      
Maximum borrowing capacity   20,000  
Inventories - truck chassis floor plan   6,938 3,939
Interest Expense, Debt   $ 30  
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   $ 2,194 1,985
Number of financial institutions for which the entity is exposed to counterparty credit risk | item   1  
Interest rate swap | Accrued Expenses and Other Current Liabilities      
Derivative [Line Items]      
Negative fair value   $ 266 335
Interest rate swap | Other Noncurrent Liabilities      
Derivative [Line Items]      
Negative fair value   $ 1,928 $ 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%  
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%  
LIBOR floor (as a percent)   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%  
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%  
LIBOR floor (as a percent)   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%  
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%  
LIBOR floor (as a percent)   1.00%