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Long term debt - Credit Facility Narrative (Details)
 12 Months Ended
Dec. 31, 2018
CAD ($)
convenant
Dec. 31, 2017
CAD ($)
Dec. 08, 2018
CAD ($)
Nov. 23, 2018
CAD ($)
Aug. 01, 2017
CAD ($)
Line of Credit Facility [Line Items]          
Payments of financing fees $ 848,000 $ 2,982,000      
Revolver          
Line of Credit Facility [Line Items]          
Payments of financing fees 754,000 840,000      
Credit facility | Revolver | Credit facilities          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity of credit facility       $ 300,000,000.0 $ 140,000,000.0
Additional borrowing limit       50,000,000.0 25,000,000.0
Capital lease borrowing limit       150,000,000.0 $ 100,000,000.0
Other outstanding debt limit       20,000,000.0  
Amount outstanding during period $ 900,000 800,000      
Number of financial covenants | convenant 2        
Senior leverage ratio, rental revenue $ 1,800,000        
Unused borrowing availability under the revolving facility $ 107,100,000 $ 107,200,000      
Senior leverage ratio 4.0       3.0
Senior leverage ratio, step-up 0.50        
Fixed charge ratio 1.15       1.15
Credit facility | Revolver | Minimum | Credit facilities          
Line of Credit Facility [Line Items]          
Standby fees percentage 0.35%        
Credit facility | Revolver | Maximum | Credit facilities          
Line of Credit Facility [Line Items]          
Standby fees percentage 0.70%        
Credit facility | Letter of Credit | Credit facilities          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity of credit facility       $ 25,000,000.0 $ 25,000,000.0
Nuna Credit Facility | Credit facilities          
Line of Credit Facility [Line Items]          
Number of financial covenants 3        
Nuna Credit Facility - Operating Loan Facility | Credit facilities          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity of credit facility     $ 5,000,000.0    
Unused borrowing availability under the revolving facility $ 5,000,000        
Nuna Credit Facility - Non-Revolving Reducing Loan Facility | Credit facilities          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity of credit facility 3,100,000.0        
Nuna Credit Facility - Equipment Facility | Credit facilities          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity of credit facility 5,500,000.0        
Amount outstanding during period $ 2,900,000        
Debt instrument, term 60 months        
Debt Covenant Period, Tranche One | Credit facility | Revolver | Credit facilities          
Line of Credit Facility [Line Items]          
Senior leverage ratio 3.50        
Debt Covenant Period, Tranche Two | Credit facility | Revolver | Credit facilities          
Line of Credit Facility [Line Items]          
Senior leverage ratio 3.0