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Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 220,801 $ 207,141 $ 250,380 $ 445,927 $ 492,297 $ 598,452 $ 675,765 $ 704,171 $ 1,124,249 $ 2,470,685 $ 3,326,997
Operating income (loss) (124,198) (114,566) (159,084) (494,410) (82,763) (307,305) (48,125) (23,383) (892,258) (461,576) (322,177)
Net loss $ (106,527) $ (112,111) $ (150,332) $ (434,722) $ (85,923) $ (261,719) $ (49,447) $ (28,614) $ (803,692) $ (425,703) $ (321,421)
Net loss per common share:                      
Basic $ (0.57) $ (0.60) $ (0.81) $ (2.28) $ (0.44) $ (1.31) $ (0.24) $ (0.14) $ (4.27) $ (2.10) $ (1.47)
Diluted $ (0.57) $ (0.60) $ (0.81) $ (2.28) $ (0.44) $ (1.31) $ (0.24) $ (0.14) $ (4.27) $ (2.10) $ (1.47)
Included within net loss:                      
Goodwill impairment, after tax       $ 340,147   $ 14,276          
Restructuring, after tax     $ 33,967                
Impairment expense related to oil and natural gas properties     604 $ 9,084         $ 11,200 $ 2,200 $ 1,000
Gain on sale of facility     7,314 [1]     162,581 [2]     3,079 13,904 28,958
Net gain from the realization of insurance proceeds, after tax [3]     (3,696)                
Impairment of capacity reservation contract, after tax     $ 8,157 [4]       $ 10,519 [4]   $ (7,059) $ 2,305 $ 17,569
Gain on early debt extinguishment, after tax [5] $ (2,916)                    
Directional drilling charges [6]           13,616          
Oilfield technology and manufacturing charges, after tax [7]           11,694          
Early repayment of debt charge, after tax [8]         $ 12,401 $ 6,614          
[1]

Impairment of property and equipment related to Canadian drilling operations was included in “Depreciation, depletion, amortization and impairment” in the consolidated statements of operations.
[2]

Impairment of property and equipment was included in “Depreciation, depletion, amortization and impairment” in the consolidated statements of operations.
[3]

Net gain from the realization of insurance proceeds was included in “Other operating expenses (income), net” in the consolidated statements of operations.
[4]

Impairment of capacity reservation contract was included in “Other operating expenses (income), net” in the consolidated statements of operations.
[5] Gain on early debt extinguishment was included in “Interest expense, net of amount capitalized” in the consolidated statements of operations.
[6]

Directional drilling charges were included in “Direct operating costs” in the consolidated statements of operations.
[7]

Inventory write-offs and severance expense as a result of transitioning away from our engineering and manufacturing efforts in Calgary were included in “Direct operating costs” and “Selling, general and administrative” in the consolidated statements of operations, respectively.
[8]

Early repayment of debt charge was included in “Interest expense, net of amount capitalized” in the consolidated statements of operations.