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Reportable Segments - Additional Information (Detail)
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3 Months Ended | 12 Months Ended | |
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Mar. 31, 2013
Segment
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Mar. 31, 2012
Customer
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Dec. 31, 2012
Segment
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| Segment Information [Line Items] | |||
| Number of operating segments | 5 | 6 | |
| Number of customers accounted for more than 10 percent or more of revenues | 0 | ||
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International Drilling [Member]
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| Segment Information [Line Items] | |||
| Percentage of revenue from major customer | 38.50% | ||
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Exxon Neftegas Limited [Member]
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| Segment Information [Line Items] | |||
| Percentage of revenue from major customer | 15.10% | ||
| X | ||||||||||
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- Definition
Number Of Customer Accounted For Ten Percent Or More Of Revenue No definition available.
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| 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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