Net Change in Other Assets and Liabilities - Effect of Changes in Other Assets and Liabilities on Cash Flows from Operating Activities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Capital [Line Items]
Accounts receivable	$ (15,968)	$ (92,073)
Other current assets	(65,075)	(50,738)
Other assets	(51,887)	(8,129)
Accounts payable	74,349	9,357
Other current liabilities	(23,882)	4,042
Other liabilities	35,219	35,231
Net change in other assets and liabilities	(47,244)	(102,310)
Noble-Cayman [Member]
Operating Capital [Line Items]
Accounts receivable	(15,968)	(92,073)
Other current assets	(71,784)	(49,791)
Other assets	(51,871)	(8,133)
Accounts payable	33,909	7,830
Other current liabilities	(4,294)	4,702
Other liabilities	51,346	35,227
Net change in other assets and liabilities	$ (58,662)	$ (102,238)