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Change in Property, Plant and Equipment (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance $ 3,641,889  
Impairment 15,313  
Ending Balance 3,173,824 $ 3,641,889
Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 7,011,178 6,949,846
Additions 74,823 203,472
Additions through business acquisition   28,125
Re-measurement to fair value before disposal   7,605
Disposals (82,826) (67,201)
Reclassifications (374)  
Effect of foreign currency exchange differences (269,167) (110,669)
Ending Balance 6,733,634 7,011,178
Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,369,289 3,066,514
Depreciation expense 383,521 394,418
Disposals (74,755) (46,331)
Impairment 15,313  
Effect of foreign currency exchange differences (133,558) (45,312)
Ending Balance 3,559,810 3,369,289
Rig Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,210,933  
Ending Balance 2,823,782 3,210,933
Rig Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 6,266,991 6,069,179
Additions 21,268 88,277
Additions through business acquisition   28,125
Re-measurement to fair value before disposal   7,605
Disposals (71,014) (50,384)
Reclassifications 67,779 229,012
Effect of foreign currency exchange differences (250,858) (104,823)
Ending Balance 6,034,166 6,266,991
Rig Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,056,058 2,789,991
Depreciation expense 334,896 342,224
Disposals (67,304) (32,427)
Impairment 15,313  
Effect of foreign currency exchange differences (128,579) (43,730)
Ending Balance 3,210,384 3,056,058
Rental Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 79,398  
Ending Balance 60,179 79,398
Rental Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 159,144 171,220
Additions 71 92
Disposals (9,758) (11,389)
Reclassifications 84  
Effect of foreign currency exchange differences (1,530) (779)
Ending Balance 148,011 159,144
Rental Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 79,746 74,220
Depreciation expense 15,159 16,039
Disposals (6,331) (10,246)
Effect of foreign currency exchange differences (742) (267)
Ending Balance 87,832 79,746
Other Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 85,731  
Ending Balance 66,560 85,731
Other Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 247,073 240,192
Additions 49 1,092
Disposals (785) (4,988)
Reclassifications 216 12,874
Effect of foreign currency exchange differences (1,603) (2,097)
Ending Balance 244,950 247,073
Other Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 161,342 142,846
Depreciation expense 19,914 22,504
Disposals (592) (3,241)
Effect of foreign currency exchange differences (2,274) (767)
Ending Balance 178,390 161,342
Vehicles [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 22,030  
Ending Balance 16,280 22,030
Vehicles [member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 45,147 43,552
Additions 42 166
Disposals (339) (440)
Reclassifications 113 2,573
Effect of foreign currency exchange differences (1,762) (704)
Ending Balance 43,201 45,147
Vehicles [member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 23,117 18,712
Depreciation expense 5,064 5,060
Disposals (320) (417)
Effect of foreign currency exchange differences (940) (238)
Ending Balance 26,921 23,117
Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 82,335  
Ending Balance 71,102 82,335
Buildings [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 131,361 131,164
Additions 235 913
Disposals (930)  
Reclassifications   702
Effect of foreign currency exchange differences (3,281) (1,418)
Ending Balance 127,385 131,361
Buildings [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 49,026 40,745
Depreciation expense 8,488 8,591
Disposals (208)  
Effect of foreign currency exchange differences (1,023) (310)
Ending Balance 56,283 49,026
Assets Under Construction [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 126,430  
Ending Balance 102,035 126,430
Assets Under Construction [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 126,430 258,952
Additions 53,158 112,932
Reclassifications (68,566) (245,161)
Effect of foreign currency exchange differences (8,987) (293)
Ending Balance 102,035 126,430
Land [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 35,032  
Ending Balance 33,886 35,032
Land [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 35,032 35,587
Effect of foreign currency exchange differences (1,146) (555)
Ending Balance $ 33,886 $ 35,032