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Change in Property, Plant and Equipment (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance $ 3,173,824  
Impairment   $ 15,313
Ending Balance 3,038,612 3,173,824
Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 6,733,634 7,011,178
Additions 114,576 74,823
Disposals (115,029) (82,826)
Reclassifications   (374)
Effect of foreign currency exchange differences 339,279 (269,167)
Ending Balance 6,937,062 6,733,634
Reclassification to assets held for sale (135,398)  
Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,559,810 3,369,289
Depreciation expense 373,572 383,521
Disposals (102,886) (74,755)
Effect of foreign currency exchange differences 183,694 (133,558)
Ending Balance 3,898,450 3,559,810
Reclassification to assets held for sale (115,740)  
Rig Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 2,823,782  
Impairment   15,313
Ending Balance 2,745,172 2,823,782
Rig Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 6,034,166 6,266,991
Additions 7,013 21,268
Disposals (32,153) (71,014)
Reclassifications 127,668 67,779
Effect of foreign currency exchange differences 321,240 (250,858)
Ending Balance 6,322,536 6,034,166
Reclassification to assets held for sale (135,398)  
Rig Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,210,384 3,056,058
Depreciation expense 335,215 334,896
Disposals (28,399) (67,304)
Effect of foreign currency exchange differences 175,904 (128,579)
Ending Balance 3,577,364 3,210,384
Reclassification to assets held for sale (115,740)  
Rental Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 60,179  
Ending Balance 43,992 60,179
Rental Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 148,011 159,144
Additions   71
Disposals (18,227) (9,758)
Reclassifications   84
Effect of foreign currency exchange differences 679 (1,530)
Ending Balance 130,463 148,011
Rental Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 87,832 79,746
Depreciation expense 9,418 15,159
Disposals (11,249) (6,331)
Effect of foreign currency exchange differences 470 (742)
Ending Balance 86,471 87,832
Other Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 66,560  
Ending Balance 52,195 66,560
Other Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 244,950 247,073
Additions 347 49
Disposals (59,865) (785)
Reclassifications 507 216
Effect of foreign currency exchange differences 5,351 (1,603)
Ending Balance 191,290 244,950
Other Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 178,390 161,342
Depreciation expense 15,993 19,914
Disposals (59,857) (592)
Effect of foreign currency exchange differences 4,569 (2,274)
Ending Balance 139,095 178,390
Vehicles [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 16,280  
Ending Balance 12,702 16,280
Vehicles [member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 43,201 45,147
Additions   42
Disposals (228) (339)
Reclassifications   113
Effect of foreign currency exchange differences 2,483 (1,762)
Ending Balance 45,456 43,201
Vehicles [member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 26,921 23,117
Depreciation expense 4,820 5,064
Disposals (220) (320)
Effect of foreign currency exchange differences 1,233 (940)
Ending Balance 32,754 26,921
Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 71,102  
Ending Balance 65,561 71,102
Buildings [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 127,385 131,361
Additions 569 235
Disposals (3,663) (930)
Effect of foreign currency exchange differences 4,036 (3,281)
Ending Balance 128,327 127,385
Buildings [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 56,283 49,026
Depreciation expense 8,126 8,488
Disposals (3,161) (208)
Effect of foreign currency exchange differences 1,518 (1,023)
Ending Balance 62,766 56,283
Assets Under Construction [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 102,035  
Ending Balance 84,561 102,035
Assets Under Construction [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 102,035 126,430
Additions 106,647 53,158
Reclassifications (128,175) (68,566)
Effect of foreign currency exchange differences 4,054 (8,987)
Ending Balance 84,561 102,035
Land [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 33,886  
Ending Balance 34,429 33,886
Land [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 33,886 35,032
Disposals (893)  
Effect of foreign currency exchange differences 1,436 (1,146)
Ending Balance $ 34,429 $ 33,886