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Change in Property, Plant and Equipment (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance $ 3,038,612  
Reversal of impairment of property, plant and equipment (5,810)  
Ending Balance 2,749,463 $ 3,038,612
Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 6,937,062 6,733,634
Additions 159,886 114,576
Disposals (100,707) (115,029)
Reclassification to assets held for sale   (135,398)
Asset decommissioning (4,364)  
Effect of foreign currency exchange differences (320,898) 339,279
Ending Balance 6,670,979 6,937,062
Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,898,450 3,559,810
Depreciation expense 320,736 373,572
Disposals (59,962) (102,886)
Reclassification to assets held for sale   (115,740)
Asset decommissioning (3,518)  
Reversal of impairment of property, plant and equipment (5,810)  
Effect of foreign currency exchange differences (228,380) 183,694
Ending Balance 3,921,516 3,898,450
Rig Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 2,745,172  
Ending Balance 2,510,505 2,745,172
Rig Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 6,322,536 6,034,166
Additions 18,436 7,013
Disposals (69,945) (32,153)
Reclassifications 150,674 127,668
Reclassification to assets held for sale   (135,398)
Asset decommissioning (4,364)  
Effect of foreign currency exchange differences (307,954) 321,240
Ending Balance 6,109,383 6,322,536
Rig Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 3,577,364 3,210,384
Depreciation expense 289,056 335,215
Disposals (33,929) (28,399)
Reclassification to assets held for sale   (115,740)
Asset decommissioning (3,518)  
Reversal of impairment of property, plant and equipment (5,810)  
Effect of foreign currency exchange differences (224,285) 175,904
Ending Balance 3,598,878 3,577,364
Rental Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 43,992  
Ending Balance 34,437 43,992
Rental Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 130,463 148,011
Disposals (19,982) (18,227)
Effect of foreign currency exchange differences (174) 679
Ending Balance 110,307 130,463
Rental Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 86,471 87,832
Depreciation expense 7,473 9,418
Disposals (17,933) (11,249)
Effect of foreign currency exchange differences (141) 470
Ending Balance 75,870 86,471
Other Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 52,195  
Ending Balance 38,604 52,195
Other Equipment [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 191,290 244,950
Additions 976 347
Disposals (4,708) (59,865)
Reclassifications 1,197 507
Effect of foreign currency exchange differences (3,436) 5,351
Ending Balance 185,319 191,290
Other Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 139,095 178,390
Depreciation expense 13,023 15,993
Disposals (3,274) (59,857)
Effect of foreign currency exchange differences (2,129) 4,569
Ending Balance 146,715 139,095
Vehicles [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 12,702  
Ending Balance 7,796 12,702
Vehicles [member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 45,456 43,201
Additions 224  
Disposals (6,014) (228)
Effect of foreign currency exchange differences (1,160) 2,483
Ending Balance 38,506 45,456
Vehicles [member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 32,754 26,921
Depreciation expense 3,521 4,820
Disposals (4,768) (220)
Effect of foreign currency exchange differences (797) 1,233
Ending Balance 30,710 32,754
Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 65,561  
Ending Balance 56,834 65,561
Buildings [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 128,327 127,385
Additions 415 569
Disposals (58) (3,663)
Effect of foreign currency exchange differences (2,507) 4,036
Ending Balance 126,177 128,327
Buildings [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 62,766 56,283
Depreciation expense 7,663 8,126
Disposals (58) (3,161)
Effect of foreign currency exchange differences (1,028) 1,518
Ending Balance 69,343 62,766
Assets Under Construction [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 84,561  
Ending Balance 67,740 84,561
Assets Under Construction [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 84,561 102,035
Additions 139,835 106,647
Reclassifications (151,871) (128,175)
Effect of foreign currency exchange differences (4,785) 4,054
Ending Balance 67,740 84,561
Land [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 34,429  
Ending Balance 33,547 34,429
Land [Member] | Gross [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
Beginning Balance 34,429 33,886
Disposals   (893)
Effect of foreign currency exchange differences (882) 1,436
Ending Balance $ 33,547 $ 34,429