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Nature of Business (Details)
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Jun. 30, 2013
drillingunit
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Jun. 30, 2013
Continuing operations
drillingunit
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Nov. 30, 2012
Discontinued operations
Shelf Drilling Holdings, Ltd
drillingunit
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|---|---|---|---|
| Number of mobile offshore drilling units | 81 | ||
| Number of High-Specification Floaters (in drilling units) | 47 | ||
| Number of Midwater Floaters (in drilling units) | 23 | ||
| Number of High-Specification Jackups (in drilling units) | 11 | ||
| Number of Ultra-Deepwater drillships under construction (in drilling units) | 4 | 6 | |
| Number of High-Specification Jackup under construction (in drilling units) | 1 | ||
| Number of drilling units sold | 38 |