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Reportable Segments - Additional Information (Detail)
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9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | |
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Sep. 30, 2013
segment
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Sep. 30, 2013
International Drilling [Member]
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Sep. 30, 2013
Exxon Neftegas Limited [Member]
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Sep. 30, 2012
Exxon Neftegas Limited [Member]
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Sep. 30, 2012
Exxon Neftegas Limited [Member]
International Drilling [Member]
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Sep. 30, 2012
Schlumberger [Member]
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Sep. 30, 2012
Schlumberger [Member]
International Drilling [Member]
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| Segment Information [Line Items] | |||||||
| Number of operating segments | 5 | ||||||
| Percentage of revenue from major customer | 36.90% | 14.30% | 10.60% | 32.00% | 10.20% | 24.00% | |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. No definition available.
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| X | ||||||||||
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- Definition
Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
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