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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)		Jun. 30, 2015
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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Total Number Of Contract Drilling Rigs

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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