Derivative Financial Instruments - Amounts Recognized in Our Consolidated Statements of Operations Related to our FOREX Contracts Designated as Accounting Hedges (Detail) (Contract drilling, excluding depreciation [Member], Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Contract drilling, excluding depreciation [Member] \| Designated As Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (4,302)	$ 7,206	$ 3,307

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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