Financial Derivatives - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maximum period of foreign currency hedge contracts	180 days
Maximum amount of loss due to credit risk	$ 11,000,000	$ 5,500,000
Total net settlement amount asset positions	10,200,000	4,400,000
Total net settlement amount liability positions	$ 100,000	$ 100,000