Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Swaps (Details)

v3.8.0.1
Long-Term Debt - Swaps (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 20, 2015
USD ($)
contract
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Derivative [Line Items]            
Number of interest rate swap agreements | contract 3          
Inventories - truck chassis floor plan   $ 6,034   $ 6,034   $ 3,939
Bailment pool            
Derivative [Line Items]            
Bailment Pool Chasis Inventories Net   15,447   15,447   22,420
Interest Expense, Debt   52 $ 25 187 $ 25  
Senior credit facilities | Floor plan            
Derivative [Line Items]            
Maximum borrowing capacity   20,000   20,000    
Inventories - truck chassis floor plan   6,034   6,034   3,939
Interest Expense, Debt   $ 52 $ 56 134 $ 56  
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   $ 2,781   $ 2,781   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   $ 608   $ 608   335
Interest rate swap | Other Noncurrent Liabilities            
Derivative [Line Items]            
Negative fair value   $ 2,173   $ 2,173   $ 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%