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Condensed Consolidating Statement of Loss (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [Line Items]    
Revenue $ 1,321,224 $ 1,003,233
Operating expense 926,171 661,715
General and administrative expense 90,072 107,689
Restructuring   5,754
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization 304,981 228,075
Depreciation and amortization 377,746 391,659
Impairment of property, plant and equipment 15,313  
Gain on re-measurement of property, plant and equipment   (7,605)
Operating loss (88,078) (155,979)
Foreign exchange (2,970) 6,008
Finance charges 137,928 146,360
Loss on redemption and repurchase of unsecured senior notes 9,021 239
Loss before tax (232,057) (308,586)
Income taxes (100,021) (153,031)
Net loss (132,036) (155,555)
Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 1,138,049 846,867
Operating expense 809,233 551,538
General and administrative expense 44,932 59,323
Restructuring   5,469
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization 283,884 230,537
Depreciation and amortization 302,958 324,649
Impairment of property, plant and equipment 15,313  
Gain on re-measurement of property, plant and equipment   (7,605)
Operating loss (34,387) (86,507)
Foreign exchange (889) (2,121)
Finance charges (68) 118
Loss before tax (33,430) (84,504)
Income taxes (59,120) (83,404)
Net loss 25,690 (1,100)
Non-Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 190,401 169,287
Operating expense 124,115 123,041
General and administrative expense 9,535 11,173
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization 56,751 35,073
Depreciation and amortization 61,450 52,957
Operating loss (4,699) (17,884)
Foreign exchange 294 1,398
Finance charges (31) 189
Loss before tax (4,962) (19,471)
Income taxes 6,666 2,471
Net loss (11,628) (21,942)
Consolidating Adjustments [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue (7,315) (13,024)
Operating expense (7,315) (13,024)
Depreciation and amortization 220 225
Operating loss (220) (225)
Equity in loss of subsidiaries 12,383 (23,042)
Loss before tax (12,603) 22,817
Net loss (12,603) 22,817
Parent [Member]    
Disclosure of subsidiaries [Line Items]    
Revenue 89 103
Operating expense 138 160
General and administrative expense 35,605 37,193
Restructuring   285
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization (35,654) (37,535)
Depreciation and amortization 13,118 13,828
Operating loss (48,772) (51,363)
Foreign exchange (2,375) 6,731
Finance charges 138,027 146,053
Loss on redemption and repurchase of unsecured senior notes 9,021 239
Equity in loss of subsidiaries (12,383) 23,042
Loss before tax (181,062) (227,428)
Income taxes (47,567) (72,098)
Net loss $ (133,495) $ (155,330)