Reportable Segments - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
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| Segment Information [Line Items] | |||
| Number of Reportable Segments | 2 | ||
| Change in fair value of derivative positions | $ (479) | ||
| Exxon Neftegas Limited [Member] | |||
| Segment Information [Line Items] | |||
| Percentage of revenue from major customer | 26.00% | 17.90% | |
| Exxon Neftegas Limited [Member] | International & Alaska Drilling [Member] | |||
| Segment Information [Line Items] | |||
| Percentage of revenue from major customer | 44.30% | 37.10% | |
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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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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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