Reportable Segments - Additional Information (Detail) - Exxon Neftegas Limited [Member] |
6 Months Ended | |
|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Segment Information [Line Items] | ||
| Percentage of revenue from major customer | 39.80% | 26.00% |
| International & Alaska Drilling [Member] | ||
| Segment Information [Line Items] | ||
| Percentage of revenue from major customer | 58.40% | 44.30% |
| X | ||||||||||
- Definition Segment Information [Line Items] No definition available.
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|