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Summary of Changes in Long Term Borrowings (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of long term debt [Line Items]    
Beginning balance $ 1,906,934  
Changes from financing cash flows:    
Proceeds from issue of senior notes 509,180  
Redemption and repurchase of unsecured senior notes (571,975) $ (677,704)
Debt issue costs (9,196) (10,752)
Changes from financing cash flows (71,991)  
Loss on redemption and repurchase of unsecured senior notes 9,021 239
Amortization of debt issue costs 8,173  
Foreign exchange adjustment (121,700)  
Ending balance 1,730,437 1,906,934
Unsecured Senior Notes [Member]    
Disclosure of long term debt [Line Items]    
Beginning balance 1,933,993  
Changes from financing cash flows:    
Proceeds from issue of senior notes 509,180  
Redemption and repurchase of unsecured senior notes (571,975)  
Changes from financing cash flows (62,795)  
Loss on redemption and repurchase of unsecured senior notes 9,021  
Foreign exchange adjustment (121,700)  
Ending balance 1,758,519 1,933,993
Debt Issue Costs [Member]    
Disclosure of long term debt [Line Items]    
Beginning balance (27,059)  
Changes from financing cash flows:    
Debt issue costs (9,196)  
Changes from financing cash flows (9,196)  
Amortization of debt issue costs 8,173  
Ending balance $ (28,082) $ (27,059)