Derivative Financial Instruments - Amounts Recognized in Consolidated Balance Sheets and Consolidated Statements of Operations Related to Derivative Financial Instruments Designated as Cash Flow Hedges (Detail) - Derivative Designated as Accounting Hedges [Member] - FOREX Contracts [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCGL on derivative (effective portion)	$ (61)	$ (2,420)
Contract Drilling Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from AOCGL into income (effective portion)	$ (415)	(7,829)
Foreign Currency Transaction (Loss) Gain [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)		$ (1)