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Property and Equipment - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2015 $ / bbl | Sep. 30, 2015 USD ($) $ / bbl | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Rigs | Dec. 31, 2015 USD ($) Rigs
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment charge for the write-down of drilling equipment | $ |  |  | $ 29,000,000 | $ 0 | $ 131,000,000
Expected cash flows from contract drilling segment | $ |  | $ 801,000,000 |  |  | $ 710,000,000
Average oil price per barrel | $ / bbl | 38.22 | 46.42 |  |  |
Drilling Rigs That Would No Longer Be Marketed As Rigs |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Number of drilling rigs |  |  |  |  | 33
Mechanically Powered Drilling Rigs That Would No Longer Be Marketed as Rigs |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Number of drilling rigs |  |  |  |  | 24
Non-APEX® electric Drilling Rigs That Would No Longer Be Marketed as Rigs |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Number of drilling rigs |  |  |  |  | 9
Mechanically powered drilling rigs that remain marketed but are not operating |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Number of drilling rigs |  |  |  | 19 | 15
Pressure Pumping |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment charge for the write-down of drilling equipment | $ |  |  | $ 0 | $ 0 | $ 22,000,000
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of long-lived assets |  | 60.00% |  |  | 100.00%
Contract Drilling |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of long-lived assets |  | 120.00% |  |  | 120.00%

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