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Condensed Consolidated Statement of Cash Flow (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of subsidiaries [Line Items]    
Operations $ 288,159 $ 293,334
Investments (74,500) (100,794)
Financing (231,814) (169,085)
Effect of exchange rate changes on cash and cash equivalents (3,770) 8,090
Increase (decrease) in cash and cash equivalents (21,925) 31,545
Cash and cash equivalents, beginning of year 96,626 65,081
Cash and cash equivalents, end of year 74,701 96,626
Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Operations 480,215 351,782
Investments (56,937) (75,740)
Financing (438,350) (247,017)
Effect of exchange rate changes on cash and cash equivalents (1,415) 2,691
Increase (decrease) in cash and cash equivalents (16,487) 31,716
Cash and cash equivalents, beginning of year 37,138 5,422
Cash and cash equivalents, end of year 20,651 37,138
Non-Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Operations (2,680) 44,453
Investments (15,337) (16,253)
Financing 21,936 (39,285)
Effect of exchange rate changes on cash and cash equivalents (1,683) 3,131
Increase (decrease) in cash and cash equivalents 2,236 (7,954)
Cash and cash equivalents, beginning of year 30,862 38,816
Cash and cash equivalents, end of year 33,098 30,862
Consolidating Adjustments [Member]    
Disclosure of subsidiaries [Line Items]    
Investments (410,979) (286,302)
Financing 410,979 286,302
Parent [member]    
Disclosure of subsidiaries [Line Items]    
Operations (189,376) (102,901)
Investments 408,753 277,501
Financing (226,379) (169,085)
Effect of exchange rate changes on cash and cash equivalents (672) 2,268
Increase (decrease) in cash and cash equivalents (7,674) 7,783
Cash and cash equivalents, beginning of year 28,626 20,843
Cash and cash equivalents, end of year $ 20,952 $ 28,626