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Condensed Consolidated Statement of Net Earnings (Loss) (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of subsidiaries [Line Items]    
Revenue $ 1,541,320 $ 1,541,189
Operating expense 1,038,967 1,067,264
General and administrative expense 104,010 111,830
Restructuring 6,438 1,164
Other recoveries   (14,200)
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization 391,905 375,131
Depreciation and amortization 333,616 377,044
Gain on asset disposals (50,741) (11,384)
Impairment of goodwill   207,544
Loss on asset decommissioning 20,263  
Reversal of impairment of property, plant and equipment (5,810)  
Foreign exchange (8,722) 4,017
Finance charges 118,453 127,178
Gain on redemption and repurchase of unsecured senior notes (6,815) (5,672)
Loss before income taxes (8,339) (323,596)
Income taxes (14,957) (29,326)
Net earnings (loss) 6,618 (294,270)
Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 1,341,624 1,356,913
Operating expense 909,898 949,451
General and administrative expense 57,119 48,748
Restructuring 3,616 1,164
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization 370,991 357,550
Depreciation and amortization 262,914 304,070
Gain on asset disposals (50,439) (6,051)
Impairment of goodwill   207,544
Loss on asset decommissioning 20,263  
Reversal of impairment of property, plant and equipment (5,810)  
Foreign exchange (758) (443)
Finance charges (354) (233)
Loss before income taxes 145,175 (147,337)
Income taxes 44,809 13,863
Net earnings (loss) 100,366 (161,200)
Non-Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 210,292 191,131
Operating expense 139,701 124,689
General and administrative expense 8,473 10,444
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization 62,118 55,998
Depreciation and amortization 57,205 60,562
Gain on asset disposals (255) (19)
Foreign exchange 535 (359)
Finance charges 32 653
Loss before income taxes 4,601 (4,839)
Income taxes 2,853 2,936
Net earnings (loss) 1,748 (7,775)
Consolidating Adjustments [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue (10,688) (6,959)
Operating expense (10,688) (6,959)
Depreciation and amortization 225 216
Equity in earnings (loss) of subsidiaries 102,114 (168,975)
Loss before income taxes (102,339) 168,759
Net earnings (loss) (102,339) 168,759
Parent [member]    
Disclosure of subsidiaries [Line Items]    
Revenue 92 104
Operating expense 56 83
General and administrative expense 38,418 52,638
Restructuring 2,822  
Other recoveries   (14,200)
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization (41,204) (38,417)
Depreciation and amortization 13,272 12,196
Gain on asset disposals (47) (5,314)
Foreign exchange (8,499) 4,819
Finance charges 118,775 126,758
Gain on redemption and repurchase of unsecured senior notes (6,815) (5,672)
Equity in earnings (loss) of subsidiaries (102,114) 168,975
Loss before income taxes (55,776) (340,179)
Income taxes (62,619) (46,125)
Net earnings (loss) $ 6,843 $ (294,054)