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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) - Operating Segments [Member] | Sep. 30, 2016
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Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 61 | [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) | 40 |
North & South America (Excl. Brazil) [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 15 | [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) | 7 |
Europe & Mediterranean [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 16 | [1]
Europe & Mediterranean [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 5 |
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) | 2 |
Middle East & Africa [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 10 |
Asia & Pacific Rim [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 11 | [1]
Asia & Pacific Rim [Member] | Construction in Progress [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 3 | [1]
Asia & Pacific Rim [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 4 |
Asia & Pacific Rim [Member] | Floaters [Member] | Construction in Progress [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Asia & Pacific Rim [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 7 |
Asia & Pacific Rim [Member] | Jackup [Member] | Construction in Progress [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 2 |
Discontinued Operations, Held-for-sale [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 4 | [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) | 3 |
[1] | We provide management services on two rigs owned by third-parties not included in the table above.

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