Derivative Financial Instruments - Additional Information (Detail)					9 Months Ended
	Sep. 30, 2014 Forward Contract to Sell [Member] Contract	Dec. 31, 2013 Forward Contract to Sell [Member] Contract	Sep. 30, 2014 Forward Contract to Purchase [Member] Contract	Dec. 31, 2013 Forward Contract to Purchase [Member] Contract	Sep. 30, 2014 Foreign Exchange Forward [Member]	Sep. 30, 2014 Foreign Exchange Option [Member] Contract	Dec. 31, 2013 Foreign Exchange Option [Member] Contract
Derivative [Line Items]
Number of forward contracts outstanding	1	1	1	1		0	0
Forward contract terms					30-day forward contract