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Reportable Segments - Results of Operations by Reportable Segment (Parenthetical) (Detail)
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12 Months Ended | ||
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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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| Segment Reporting Information [Line Items] | |||
| Number of major customer | 2 | ||
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Exxon Neftegas Limited (ENL) [Member]
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| Segment Reporting Information [Line Items] | |||
| Percent of total revenues | 15.60% | 12.00% | 16.00% |
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Exxon Neftegas Limited (ENL) [Member] | International Drilling [Member]
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| Segment Reporting Information [Line Items] | |||
| Percent of segment revenues | 38.30% | 27.00% | 34.00% |
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Exxon Neftegas Limited (ENL) [Member] | Technical Services [Member]
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| Segment Reporting Information [Line Items] | |||
| Percent of segment revenues | 33.90% | ||
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Dowell Schlumberger [Member]
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| Segment Reporting Information [Line Items] | |||
| Percent of total revenues | 10.00% | ||
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Dowell Schlumberger [Member] | International Drilling [Member]
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| Segment Reporting Information [Line Items] | |||
| Percent of segment revenues | 24.00% | ||