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Property and Equipment - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 24, 2015 $ / bbl | Mar. 17, 2015 $ / bbl | Sep. 30, 2015 USD ($) Rigs $ / bbl | Jun. 30, 2015 $ / bbl | Mar. 31, 2015 $ / bbl | Sep. 30, 2015 USD ($) Rigs
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Expected cash flows from contract drilling segment |  |  | $ 801.0 |  |  | $ 801.0
Average oil price per barrel | $ / bbl | 38.22 | 43.39 | 46.42 | 57.85 | 48.54 |
Impairment charges related to oil and natural gas properties |  |  | $ 1.9 |  |  | $ 9.3
Drilling Rigs That Would No Longer Be Marketed As Rigs |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Number of drilling rings | Rigs |  |  | 33 |  |  | 33
Impairment charges of fleets |  |  |  |  |  | $ 131.0
Mechanically Powered Drilling Rigs That Would No Longer Be Marketed as Rigs |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Number of drilling rings | Rigs |  |  | 24 |  |  | 24
Non-APEX® electric Drilling Rigs That Would No Longer Be Marketed as Rigs |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Number of drilling rings | Rigs |  |  | 9 |  |  | 9
Mechanically powered drilling rigs that remain marketable but are not operating |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Number of drilling rings | Rigs |  |  | 15 |  |  | 15
Pressure Pumping |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Impairment charges of fleets |  |  | $ 22.0 |  |  |

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