Derivative Financial Instrument - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivatives, Fair Value [Line Items]
Gain on foreign currency forward	$ 0	$ 0	$ 0	$ 29,983
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative financial instrument final settlement date				Jan. 30, 2015
Gain on foreign currency forward				$ 30,000