Derivative Instruments and Hedging Activities - Summarization of Recognized Gains and Losses of Cash Flow Hedges (Detail) - Foreign Currency Forward Contracts [Member] - Cash Flow Hedges [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized through AOCL	$ (2,414)	$ 4,286
Contract Drilling Services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) reclassified from AOCL to "contract drilling services" expense	$ 2,414	$ (4,286)