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Property and Equipment - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Rigs | Dec. 31, 2018 USD ($) Rigs | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2019
Pressure Pumping |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment charge for the write-down of drilling equipment | $ 20,500,000 | $ 17,400,000 | $ 0 | $ 0 |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups |  | 58.00% |  |  | 54.00%
Directional Drilling |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment charge for the write-down of drilling equipment | $ 8,400,000 | $ 0 | 0 |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups |  | 9.00% |  |  | 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% |  |  | 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% |  |  | 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 |  |  |
Impairment charge for the write-down of drilling equipment | $ 173,000,000 | $ 48,400,000 | $ 29,000,000.0 |  |

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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 + Details
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