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Property and Equipment - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Rigs | Dec. 31, 2018 USD ($) Rigs | Mar. 31, 2020 | Sep. 30, 2019
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Impairment charge of drilling equipment | $ 8,300,000 |  |  |  |  |
Pressure Pumping |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Impairment charge of drilling equipment |  | $ 0 | $ 20,500,000 | $ 17,400,000 |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups |  |  |  | 58.00% | 22.00% | 54.00%
Directional Drilling |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Impairment charge of drilling equipment |  | $ 0 | 8,400,000 | $ 0 |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups |  |  |  | 9.00% | 3.00% | 23.00%
Contract Drilling |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups |  |  |  | 38.00% | 15.00% | 35.00%
Oilfield Rentals |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups |  |  |  | 23.00% | 9.00% | 7.00%
Rigs and Spare Rig Components That Would No Longer Be Marketed |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Impairment charge of drilling equipment | $ 8,300,000 |  | $ 173,000,000 | $ 48,400,000 |  |
Number of rigs | Rigs |  |  | 36 | 42 |  |

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