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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Jun. 30, 2015
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Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 69
Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 27
Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 42
North & South America (Excl. Brazil) [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 16
North & South America (Excl. Brazil) [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 9
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) | [1] | 12
Europe & Mediterranean [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 1
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) | [1] | 15
Middle East & Africa [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 3
Middle East & Africa [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 12
Asia & Pacific Rim [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 11
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) |  | 7
Middle East Under Construction Member [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 2
Middle East Under Construction Member [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 0
Middle East Under Construction Member [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 2
Brazil [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 4
Brazil [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 4
Brazil [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 0
Discontinued Operations, Held-for-sale [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 6
Discontinued Operations, Held-for-sale [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 4
Discontinued Operations, Held-for-sale [Member] | Jackup [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 2
Construction in Progress [Member] | Asia & Pacific Rim [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) | [1] | 3
Construction in Progress [Member] | Asia & Pacific Rim [Member] | Floaters [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of contract drilling rigs (in rigs) |  | 2
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 six rigs owned by third-parties not included in the table above.

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