Reportable Segments - Additional Information (Detail) - Exxon Neftegas Limited [Member] |
3 Months Ended | |
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Mar. 31, 2016 |
Mar. 31, 2015 |
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| Segment Information [Line Items] | ||
| Percentage of revenue from major customer | 39.20% | 22.90% |
| International & Alaska Drilling [Member] | ||
| Segment Information [Line Items] | ||
| Percentage of revenue from major customer | 57.80% | 41.00% |
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- Definition Segment Information [Line Items] No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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