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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Mar. 31, 2017 rigs
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Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 59 | [1]
Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 21 |
Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 38 |
North South America Incl Brazil [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 13 | [1]
North South America Incl Brazil [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 8 |
North South America Incl Brazil [Member] | Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 5 |
Europe & Mediterranean [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 17 | [1]
Europe & Mediterranean [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 6 |
Europe & Mediterranean [Member] | Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 11 |
Middle East [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 12 | [1]
Middle East [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Middle East [Member] | Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 11 |
Asia Pacific [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 10 | [1]
Asia Pacific [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 4 |
Asia Pacific [Member] | Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 6 |
Asia & Pacific Rim (under construction) [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 2 | [1]
Asia & Pacific Rim (under construction) [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Asia & Pacific Rim (under construction) [Member] | Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 5 | [1]
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Jackups Member |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 4 |
[1] | We provide management services on two rigs owned by third-parties in the Gulf of Mexico and not included in the table above.

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