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Summary of Operating Segments (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [Line Items] |  |
Revenue | $ 935,753 | $ 1,541,320
Operating earnings (loss) | (109,184) | (8,339)
Depreciation and amortization | 316,322 | 333,616
Total assets | 2,898,878 | 3,269,840
All Other Segments [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | 935,753 | 1,541,320
Operating earnings (loss) | (40,988) | 94,577
Depreciation and amortization | 316,322 | 333,616
Loss (gain) on asset disposals | (11,931) | (50,741)
Total assets | 2,898,878 | 3,269,840
Capital expenditures | 61,592 | 160,694
Loss on asset decommissioning |  | 20,263
Reversal of impairment of property, plant and equipment |  | (5,810)
Contract Drilling Services [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | 861,202 | 1,399,068
Contract Drilling Services [Member] | All Other Segments [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | 861,202 | 1,399,068
Operating earnings (loss) | 22,207 | 160,997
Depreciation and amortization | 288,389 | 300,882
Loss (gain) on asset disposals | (10,171) | (46,849)
Total assets | 2,571,397 | 2,963,260
Capital expenditures | 57,741 | 154,066
Loss on asset decommissioning |  | 20,263
Reversal of impairment of property, plant and equipment |  | (5,810)
Completion and Production Services [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | 77,251 | 147,829
Completion and Production Services [Member] | All Other Segments [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | 77,251 | 147,829
Operating earnings (loss) | (3,671) | 10,041
Depreciation and amortization | 16,375 | 17,881
Loss (gain) on asset disposals | (1,447) | (3,767)
Total assets | 132,771 | 152,611
Capital expenditures | 3,362 | 5,448
Corporate and Other [Member] | All Other Segments [Member] |  |
Disclosure of operating segments [Line Items] |  |
Operating earnings (loss) | (59,524) | (76,461)
Depreciation and amortization | 11,558 | 14,853
Loss (gain) on asset disposals | (313) | (125)
Total assets | 194,710 | 153,969
Capital expenditures | 489 | 1,180
Inter- Segment Eliminations [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | (2,700) | (5,577)
Inter- Segment Eliminations [Member] | All Other Segments [Member] |  |
Disclosure of operating segments [Line Items] |  |
Revenue | $ (2,700) | $ (5,577)

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