Net Change in Other Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Effect of changes in other assets and liabilities on cash flows from operating activities
Accounts receivable	$ (87,244)	$ (122,605)
Other current assets	(82,590)	(55,141)
Other assets	(10,452)	(13,344)
Accounts payable	9,776	(17,020)
Other current liabilities	(2,282)	1,544
Other liabilities	33,608	16,030
Net change in other assets and liabilities	(139,184)	(190,536)
Noble-Cayman [Member]
Effect of changes in other assets and liabilities on cash flows from operating activities
Accounts receivable	(87,244)	(122,572)
Other current assets	(85,357)	(46,895)
Other assets	(10,454)	(15,821)
Accounts payable	8,804	(17,050)
Other current liabilities	(1,997)	(11,283)
Other liabilities	33,608	16,004
Net change in other assets and liabilities	$ (142,640)	$ (197,617)