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Condensed Consolidating Statement of Earnings (Loss) (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [Line Items]    
Revenue $ 1,541,189 $ 1,321,224
Operating expense 1,067,871 926,171
General and administrative expense 112,387 90,072
Other recoveries (14,200)  
Earnings (loss) before income taxes, equity in loss of subsidiaries, gain (loss) on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill and depreciation and amortization 375,131 304,981
Depreciation and amortization 365,660 377,746
Impairment of goodwill 207,544  
Impairment of property, plant and equipment   15,313
Foreign exchange 4,017 (2,970)
Finance charges 127,178 137,928
(Gain) loss on redemption and repurchase of unsecured senior notes (5,672) 9,021
Loss before income taxes (323,596) (232,057)
Income taxes (29,326) (100,021)
Net loss (294,270) (132,036)
Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 1,356,913 1,138,049
Operating expense 950,058 809,233
General and administrative expense 49,305 44,932
Earnings (loss) before income taxes, equity in loss of subsidiaries, gain (loss) on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill and depreciation and amortization 357,550 283,884
Depreciation and amortization 298,019 302,958
Impairment of goodwill 207,544  
Impairment of property, plant and equipment   15,313
Foreign exchange (443) (889)
Finance charges (233) (68)
Loss before income taxes (147,337) (33,430)
Income taxes 13,863 (59,120)
Net loss (161,200) 25,690
Non-Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 191,131 190,401
Operating expense 124,689 124,115
General and administrative expense 10,444 9,535
Earnings (loss) before income taxes, equity in loss of subsidiaries, gain (loss) on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill and depreciation and amortization 55,998 56,751
Depreciation and amortization 60,542 61,450
Foreign exchange (359) 294
Finance charges 653 (31)
Loss before income taxes (4,838) (4,962)
Income taxes 2,936 6,666
Net loss (7,774) (11,628)
Consolidating Adjustments [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue (6,959) (7,315)
Operating expense (6,959) (7,315)
Depreciation and amortization 217 220
Equity in loss of subsidiaries (168,975) 12,383
Loss before income taxes 168,758 (12,603)
Net loss 168,758 (12,603)
Parent [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 104 89
Operating expense 83 138
General and administrative expense 52,638 35,605
Other recoveries (14,200)  
Earnings (loss) before income taxes, equity in loss of subsidiaries, gain (loss) on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of goodwill and depreciation and amortization (38,417) (35,654)
Depreciation and amortization 6,882 13,118
Foreign exchange 4,819 (2,375)
Finance charges 126,758 138,027
(Gain) loss on redemption and repurchase of unsecured senior notes (5,672) 9,021
Equity in loss of subsidiaries 168,975 (12,383)
Loss before income taxes (340,179) (181,062)
Income taxes (46,125) (47,567)
Net loss $ (294,054) $ (133,495)