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Condensed Consolidated Statement of Net Earnings (Loss) (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [Line Items]    
Revenue $ 935,753 $ 1,541,320
Operating expense 583,420 1,038,967
General and administrative expense 70,869 104,010
Restructuring 18,061 6,438
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization 263,403 391,905
Depreciation and amortization 316,322 333,616
Gain on asset disposals (11,931) (50,741)
Loss on asset decommissioning   20,263
Reversal of impairment of property, plant and equipment   (5,810)
Foreign exchange 4,542 (8,722)
Finance charges 107,468 118,453
Gain on redemption and repurchase of unsecured senior notes (43,814) (6,815)
Loss before income taxes (109,184) (8,339)
Income taxes 10,954 (14,957)
Net earnings (loss) (120,138) 6,618
Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 752,737 1,341,624
Operating expense 465,624 909,898
General and administrative expense 26,767 57,119
Restructuring 11,083 3,616
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization 249,263 370,991
Depreciation and amortization 255,299 262,914
Gain on asset disposals (11,655) (50,439)
Loss on asset decommissioning   20,263
Reversal of impairment of property, plant and equipment   (5,810)
Foreign exchange 36,313 (758)
Finance charges (2,113) (354)
Loss before income taxes (28,581) 145,175
Income taxes 18,056 44,809
Net earnings (loss) (46,637) 100,366
Non-Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 186,088 210,292
Operating expense 120,875 139,701
General and administrative expense 5,613 8,473
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization 59,600 62,118
Depreciation and amortization 50,815 57,205
Gain on asset disposals (135) (255)
Foreign exchange (24,814) 535
Finance charges 3 32
Loss before income taxes 33,731 4,601
Income taxes 9,556 2,853
Net earnings (loss) 24,175 1,748
Consolidating Adjustments [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue (3,129) (10,688)
Operating expense (3,129) (10,688)
Depreciation and amortization 227 225
Equity in earnings of subsidiaries (22,462) 102,114
Loss before income taxes 22,235 (102,339)
Net earnings (loss) 22,235 (102,339)
Parent [member]    
Disclosure of subsidiaries [Line Items]    
Revenue 57 92
Operating expense 50 56
General and administrative expense 38,489 38,418
Restructuring 6,978 2,822
Earnings before income taxes, gain on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, reversal of impairment of property, plant and equipment, loss on asset decommissioning, gain on asset disposals and depreciation and amortization (45,460) (41,204)
Depreciation and amortization 9,981 13,272
Gain on asset disposals (141) (47)
Foreign exchange (6,957) (8,499)
Finance charges 109,578 118,775
Gain on redemption and repurchase of unsecured senior notes (43,814) (6,815)
Equity in earnings of subsidiaries 22,462 (102,114)
Loss before income taxes (136,569) (55,776)
Income taxes (16,658) (62,619)
Net earnings (loss) $ (119,911) $ 6,843