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Summary of Changes in Long Term Borrowings (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of long term debt [Line Items]      
Beginning balance $ 1,237,106   $ 1,427,181
Changes from financing cash flows:      
Proceeds from unsecured senior notes 482,064    
Proceeds From Senior Credit Facility 194,277   137,255
Proceeds from Real Estate Credit Facility 20,000   13,811
Redemption and repurchase of unsecured senior notes (676,058)   (240,793)
Repayment Of Long Term Credit Facility     (37,319)
Repayment of Senior Credit Facility (146,930)    
Repayment of Real Estate Credit Facility (1,883)    
Debt issue costs (9,450)   (354)
Loss (gain) on redemption and repurchase of unsecured senior notes 9,520   (43,814)
Amortization of debt issue costs 8,720   5,350
Original issue discount 201    
Foreign exchange adjustment (8,550)   (24,211)
Current 2,223   896
Long-term 1,106,794   1,236,210
Ending balance 1,109,017   1,237,106
Senior Credit Facility [Member]      
Disclosure of long term debt [Line Items]      
Beginning balance 95,041    
Changes from financing cash flows:      
Proceeds From Senior Credit Facility 194,277   137,255
Repayment Of Long Term Credit Facility     (37,243)
Repayment of Senior Credit Facility (146,930)    
Foreign exchange adjustment 6,818   (4,971)
Long-term 149,206   95,041
Ending balance 149,206   95,041
Unsecured Senior Notes [Member]      
Disclosure of long term debt [Line Items]      
Beginning balance 1,141,638   1,445,127
Changes from financing cash flows:      
Proceeds from unsecured senior notes 482,064    
Redemption and repurchase of unsecured senior notes (676,058)   (240,793)
Loss (gain) on redemption and repurchase of unsecured senior notes 9,520   (43,814)
Original issue discount 3,628 $ 3  
Foreign exchange adjustment (15,273)   (18,882)
Long-term 945,519   1,141,638
Ending balance 945,519   1,141,638
Canadian Real Estate Credit Facility [Member]      
Changes from financing cash flows:      
Proceeds from Real Estate Credit Facility 20,000    
Repayment of Real Estate Credit Facility (1,000)    
Current 1,333    
Long-term 17,667    
Ending balance 19,000    
U.S. Real Estate Credit Facility [Member]      
Disclosure of long term debt [Line Items]      
Beginning balance 13,370    
Changes from financing cash flows:      
Proceeds from Real Estate Credit Facility     13,811
Repayment Of Long Term Credit Facility     (76)
Repayment of Real Estate Credit Facility (883)    
Foreign exchange adjustment (99)   (365)
Current 890   896
Long-term 11,498   12,474
Ending balance 12,388   13,370
Debt Issue Costs and Original Issue Discount [Member]      
Disclosure of long term debt [Line Items]      
Beginning balance (12,943)   (17,946)
Changes from financing cash flows:      
Debt issue costs (9,450)   (354)
Amortization of debt issue costs 8,720   5,350
Original issue discount (3,427)    
Foreign exchange adjustment 4   7
Long-term (17,096)   (12,943)
Ending balance $ (17,096)   $ (12,943)