General Information - Additional Information (Detail) $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Feb. 29, 2016 USD ($) Rigs	Sep. 30, 2016 USD ($) Rigs	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Rigs	Oct. 26, 2016
Property, Plant and Equipment [Line Items]
Carrying value of rigs in disposal group		$ 7,600
Proceeds from disposition of assets		169,038	$ 8,442
Amount capitalized for asset replacements and betterments		154,800		$ 262,400
Jack-ups Held for Sale [Member]
Property, Plant and Equipment [Line Items]
Carrying value of rigs in disposal group		$ 6,200		$ 14,200
Number of offshore rigs owned | Rigs		4		5
Proceeds from disposition of assets	$ 8,000
Number of offshore rigs sold | Rigs	1
Semisubmersible Drilling Rigs [Member]
Property, Plant and Equipment [Line Items]
Carrying value of rigs in disposal group		$ 1,400
Number of offshore rigs owned | Rigs		2
Subsequent Event [Member]
Property, Plant and Equipment [Line Items]
Outstanding common stock owned by Loews Corporation					53.00%