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Summary of Changes in Long Term Borrowings (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of long term debt [Line Items]    
Beginning balance $ 1,427,181 $ 1,706,253
Redemption / repurchase of unsecured senior notes (240,793) (198,387)
Repayment of long-term debt (37,319)  
Proceeds from Senior Credit Facility 137,255  
Proceeds from Real Estate Credit Facility 13,811  
Addition of debt issue costs (354)  
Non-cash changes:    
Gain on redemption and repurchase of unsecured senior notes (43,814) (6,815)
Amortization of debt issue costs 5,350 5,152
Foreign exchange adjustment (24,211) (79,022)
Reclassified to current portion of long-term debt (896)  
Ending balance 1,236,210 1,427,181
Senior Credit Facility [Member]    
Disclosure of long term debt [Line Items]    
Repayment of long-term debt (37,243)  
Proceeds from Senior Credit Facility 137,255  
Non-cash changes:    
Foreign exchange adjustment (4,971)  
Ending balance 95,041  
Unsecured Senior Notes [Member]    
Disclosure of long term debt [Line Items]    
Beginning balance 1,445,127 1,729,351
Redemption / repurchase of unsecured senior notes (240,793) (198,387)
Non-cash changes:    
Gain on redemption and repurchase of unsecured senior notes (43,814) (6,815)
Foreign exchange adjustment (18,882) (79,022)
Ending balance 1,141,638 1,445,127
Real Estate Credit Facility [Member]    
Disclosure of long term debt [Line Items]    
Repayment of long-term debt (76)  
Proceeds from Real Estate Credit Facility 13,811  
Non-cash changes:    
Foreign exchange adjustment (365)  
Reclassified to current portion of long-term debt (896)  
Ending balance 12,474  
Debt Issue Costs [Member]    
Disclosure of long term debt [Line Items]    
Beginning balance (17,946) (23,098)
Addition of debt issue costs (354)  
Non-cash changes:    
Amortization of debt issue costs 5,350 5,152
Foreign exchange adjustment 7  
Ending balance $ (12,943) $ (17,946)