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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Sep. 30, 2017
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Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 54 | [1]
Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 21 |
Jackups |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 33 |
North & South America (Excl. Brazil) |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 14 | [1]
North & South America (Excl. Brazil) | Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 8 |
North & South America (Excl. Brazil) | Jackups |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 6 |
Europe & Mediterranean |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 14 | [1]
Europe & Mediterranean | Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 4 |
Europe & Mediterranean | Jackups |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 10 |
Middle East & Africa |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 14 | [1]
Middle East & Africa | Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 3 |
Middle East & Africa | Jackups |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 11 |
Asia & Pacific Rim |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 10 | [1]
Asia & Pacific Rim | Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 5 |
Asia & Pacific Rim | Jackups |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 5 |
Held-for-sale |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 | [1]
Held-for-sale | Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 |
Held-for-sale | Jackups |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 0 |
Construction in Progress [Member] | Asia & Pacific Rim |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 1 | [1]
Construction in Progress [Member] | Asia & Pacific Rim | Floaters |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | 0 |
Construction in Progress [Member] | Asia & Pacific Rim | Jackups |  |
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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