Foreign Exchange Facility - Additional Information (Detail) (USD $)			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Prior To Amendment [Member]	Dec. 31, 2013 Amendment [Member] Forward Foreign Exchange Contacts [Member]	Dec. 31, 2013 Amendment [Member] Spot Foreign Exchange Contracts [Member]
Derivative [Line Items]
Maximum limit of foreign exchange contracts permitted under the foreign exchange facility			$ 50,000,000	$ 12,500,000	$ 10,000,000
Maximum term permitted for foreign exchange contracts			15 months	1 month
Collateral pledged as security	0	0
Outstanding forward foreign currency contracts	$ 0	$ 0