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Property and Equipment - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Rigs | Sep. 30, 2018 USD ($) Rigs | Sep. 30, 2019 USD ($) Rigs | Sep. 30, 2018 USD ($) Rigs
Pressure Pumping |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Impairment charge for the write-down of drilling equipment | $ 20,500,000 | $ 17,400,000 |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups | 54.00% |  | 54.00% |
Directional Drilling |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Impairment charge for the write-down of drilling equipment | $ 8,400,000 | $ 0 |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups | 23.00% |  | 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 | 35.00% |  | 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 | 7.00% |  | 7.00% |
Rigs and Spare Rig Components That Would No Longer Be Marketed |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Number of rigs | Rigs | 36 | 42 | 36 | 42
Impairment charge for the write-down of drilling equipment | $ 173,000,000 | $ 48,400,000 | $ 173,000,000 | $ 48,400,000

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