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Schedule of Intangibles (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [Line Items]    
Balance $ 3,316  
Loan commitment fees related to Senior Credit Facility 3,120 $ 3,316
Software 24,996  
Balance 28,116 3,316
Gross [Member]    
Disclosure of detailed information about intangible assets [Line Items]    
Balance 12,345 11,131
Additions 24,972 1,214
Reclassifications 2,390  
Balance 39,707 12,345
Gross [Member] | Loan Commitment Fees [Member]    
Disclosure of detailed information about intangible assets [Line Items]    
Balance 12,345 11,131
Additions 1,793 1,214
Balance 14,138 12,345
Gross [Member] | Software [Member]    
Disclosure of detailed information about intangible assets [Line Items]    
Additions 23,179  
Reclassifications 2,390  
Balance 25,569  
Accumulated Amortization [member]    
Disclosure of detailed information about intangible assets [Line Items]    
Balance 9,029 7,768
Amortization expense 2,562 1,261
Balance 11,591 9,029
Accumulated Amortization [member] | Loan Commitment Fees [Member]    
Disclosure of detailed information about intangible assets [Line Items]    
Balance 9,029 7,768
Amortization expense 1,989 1,261
Balance 11,018 $ 9,029
Accumulated Amortization [member] | Software [Member]    
Disclosure of detailed information about intangible assets [Line Items]    
Amortization expense 573  
Balance $ 573