Debt - Additional Information (Details)
 12 Months Ended
Nov. 13, 2015
USD ($)
Oct. 15, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Nov. 30, 2008
USD ($)
Line of Credit Facility [Line Items]            
Deferred Finance Costs, Gross $ 900,000          
Proceeds from long-term debt     $ 0 $ 67,845,000 $ 0  
Revolving Credit Facility | Credit Facility | Canadian Prime Rate [Member] | Scenario 2 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   1.25%        
Revolving Credit Facility | Credit Facility | Canadian Prime Rate [Member] | Scenario 2 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.25%        
Revolving Credit Facility | Credit Facility | Canadian Dealer Offered Rate [Member] | Scenario 4 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.25%        
Revolving Credit Facility | Credit Facility | Canadian Dealer Offered Rate [Member] | Scenario 4 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   3.25%        
Revolving Credit Facility | BOK Credit Agreement            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity           $ 150,000,000
Amount outstanding under the credit facility     $ 97,800,000 30,000,000    
Proceeds from long-term debt       $ 67,800,000    
Credit facility, interest rate     3.90% 3.92%    
Revolving credit facility, unused portion, fee percentage     0.50%      
Term Loan | Credit Facility | Canadian Prime Rate [Member] | Scenario 1 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   1.35%        
Term Loan | Credit Facility | Canadian Prime Rate [Member] | Scenario 1 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.35%        
Term Loan | Credit Facility | Canadian Dealer Offered Rate [Member] | Scenario 3 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.35%        
Term Loan | Credit Facility | Canadian Dealer Offered Rate [Member] | Scenario 3 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   3.35%        
Secured Debt | Credit Facility            
Line of Credit Facility [Line Items]            
Term of senior secured credit agreement   5 years        
Maximum borrowing capacity 400,000,000 $ 300,000,000        
Minimum interest coverage ratio   2.50        
Maximum leverage ratio   4.50        
Maximum alternative leverage ratio   5.0        
Temporary adjustment of leverage ratio   0.50        
Maximum consolidated senior secured leverage ratio   3.50        
Secured Debt | Credit Facility | Material Acquisition Period            
Line of Credit Facility [Line Items]            
Maximum consolidated senior secured leverage ratio   4.00        
Secured Debt | Revolving Credit Facility | Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 200,000,000 $ 400,000,000 $ 300,000,000    
Maximum borrowing capacity with pay-down feature 400,000,000          
Limit increase under accordion feature 100,000,000          
Maximum borrowing capacity with accordion feature $ 500,000,000          
Interest rate during period     2.71% 3.87%    
Amount outstanding under the credit facility     $ 201,000,000 $ 0    
Secured Debt | Revolving Credit Facility | Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Commitment fee percentage   0.375%        
Secured Debt | Revolving Credit Facility | Credit Facility | Maximum            
Line of Credit Facility [Line Items]            
Commitment fee percentage   0.50%        
Secured Debt | Revolving Credit Facility | Credit Facility | Base Rate | Scenario 1 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   1.25%        
Secured Debt | Revolving Credit Facility | Credit Facility | Base Rate | Scenario 1 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.25%        
Secured Debt | Revolving Credit Facility | Credit Facility | London Interbank Offered Rate (LIBOR) | Scenario 3 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.25%        
Secured Debt | Revolving Credit Facility | Credit Facility | London Interbank Offered Rate (LIBOR) | Scenario 3 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   3.25%        
Secured Debt | Term Loan | Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 100,000,000        
Increase in interest rate upon breach of covenant 1.00%          
Amount outstanding under the credit facility     41,539,000 81,358,000    
Secured Debt | Term Loan | Credit Facility | Base Rate | Scenario 1 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   1.35%        
Secured Debt | Term Loan | Credit Facility | Base Rate | Scenario 1 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.35%        
Secured Debt | Term Loan | Credit Facility | London Interbank Offered Rate (LIBOR) | Scenario 3 | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   2.35%        
Secured Debt | Term Loan | Credit Facility | London Interbank Offered Rate (LIBOR) | Scenario 3 | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   3.35%        
Secured Debt | Letter of Credit | Credit Facility            
Line of Credit Facility [Line Items]            
Amount outstanding under the credit facility     $ 0 $ 0    
Secured Debt | Standby Letters of Credit | Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 20,000,000          
Secured Debt | Swingline Sub-facility | Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 20,000,000          
Unsecured Debt | Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 150,000,000.0