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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Jun. 30, 2017
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Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 55 | [1]
Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 21 |
Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 34 |
North & South America (Excl. Brazil) [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 13 | [1]
North & South America (Excl. Brazil) [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 8 |
North & South America (Excl. Brazil) [Member] | Jackup [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] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 11 |
Middle East & Africa [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 12 | [1]
Middle East & Africa [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Middle East & Africa [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 11 |
Asia & Pacific Rim [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 9 | [1]
Asia & Pacific Rim [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 4 |
Asia & Pacific Rim [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 5 |
Discontinued Operations, Held-for-sale [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 2 | [1]
Discontinued Operations, Held-for-sale [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Discontinued Operations, Held-for-sale [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Construction in Progress [Member] | Asia & Pacific Rim [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 2 | [1]
Construction in Progress [Member] | Asia & Pacific Rim [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Construction in Progress [Member] | Asia & Pacific Rim [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
[1] | We provide management services on two rigs owned by third-parties not included in the table above.

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