Drilling and Other Property and Equipment - Additional Information (Detail) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Rigs	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Property, Plant and Equipment [Line Items]
Number of rigs sold for scrap | Rigs				9
Aggregate book value of physical assets	$ 6,378,814			$ 6,378,814	$ 6,945,953	$ 5,467,227
Gain on disposition of physical asset				2,290	5,382	$ 4,070
Impairment of assets	499,400	$ 2,600	$ 358,500	860,441	$ 109,462
Rigs [Member]
Property, Plant and Equipment [Line Items]
Aggregate book value of physical assets	5,200			5,200
Gain on disposition of physical asset				3,500
Jack-ups [Member]
Property, Plant and Equipment [Line Items]
Net book value of non-working jack-up rigs transferred to assets held for sale	$ 14,200			$ 14,200