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Disposition of Assets - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 3 Months Ended | ||||
|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
New Zealand [Member]
rig
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Dec. 31, 2013
Oklahoma [Member]
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Sep. 30, 2013
Mexico [Member]
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| Significant Acquisitions and Disposals [Line Items] | |||||||
| Number of land rigs sold | 2 | ||||||
| Assets held-for-sale, at carrying value | $ 2,300,000 | $ 300,000 | |||||
| Asset dispositions, proceeds | 200,000 | 3,200,000 | 800,000 | 500,000 | |||
| Asset dispositions, loss | 500,000 | 500,000 | 900,000 | (100,000) | 200,000 | ||
| Provision for reduction in carrying value of certain assets | $ 2,544,000 | $ 0 | $ 1,350,000 | ||||