Derivative Financial Instruments - Amounts Recognized in our Consolidated Statements of Operations Related to our FOREX Contracts Designated as Accounting Hedges (Detail) (Contract drilling expense [Member], Designated as hedging instrument [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Contract drilling expense [Member] | Designated as hedging instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (5,018)	$ (2,715)	$ (2,246)	$ (5,692)