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Commitments and Contingencies - Additional Information (Detail) (USD $)
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9 Months Ended | 10 Months Ended | 12 Months Ended | ||
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Sep. 30, 2012
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Oct. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Joint venture term | 10 years | ||||
| Initial capital contribution | $ 10,000,000 | ||||
| Non-Cancelable operating lease expiration date | 2017 | ||||
| Non-Cancelable lease agreement for office space, expiration date | December 31, 2017 | ||||
| Rent expense under lease arrangements | 716,000 | 630,000 | 463,000 | ||
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Drilling contracts [Member]
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| Commitment under contracts | 5,400,000 | ||||
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Employment agreements [Member]
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| Commitment under contracts | $ 4,900,000 | ||||