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Derivatives - Schedule of Unsettled Purchased Foreign Currency Forward Contracts (Detail)	Mar. 31, 2015 Buy Us Dollar Sell Australian Dollar [Member] Foreign Exchange [Member] AUD	Dec. 31, 2014 Buy Us Dollar Sell Australian Dollar [Member] Foreign Exchange [Member] AUD	Mar. 31, 2015 Buy Us Dollar Sell Australian Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Dec. 31, 2014 Buy Us Dollar Sell Australian Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Mar. 31, 2015 Buy Euro Sell US Dollar [Member] Foreign Exchange [Member] EUR (€)	Dec. 31, 2014 Buy Euro Sell US Dollar [Member] Foreign Exchange [Member] EUR (€)	Mar. 31, 2015 Buy Euro Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Dec. 31, 2014 Buy Euro Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Mar. 31, 2015 Buy British Pound Sterling Sell US Dollar [Member] Foreign Exchange [Member] GBP (£)	Dec. 31, 2014 Buy British Pound Sterling Sell US Dollar [Member] Foreign Exchange [Member] GBP (£)	Mar. 31, 2015 Buy British Pound Sterling Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Dec. 31, 2014 Buy British Pound Sterling Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Mar. 31, 2015 Buy Indian Rupee Sell US Dollar [Member] Foreign Exchange [Member] INR	Dec. 31, 2014 Buy Indian Rupee Sell US Dollar [Member] Foreign Exchange [Member] INR	Mar. 31, 2015 Buy Indian Rupee Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Dec. 31, 2014 Buy Indian Rupee Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Mar. 31, 2015 Buy Polish Zloty Sell US Dollar [Member] Foreign Exchange [Member] PLN	Dec. 31, 2014 Buy Polish Zloty Sell US Dollar [Member] Foreign Exchange [Member] PLN	Mar. 31, 2015 Buy Polish Zloty Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)	Dec. 31, 2014 Buy Polish Zloty Sell US Dollar [Member] Foreign currency forward contracts [Member] USD ($)
Derivative [Line Items]
Derivative notional amount	6,575,000	6,750,000	$ 5,424,000	$ 5,838,000	€ 22,700,000	€ 30,200,000	$ 28,676,000	$ 38,777,000	£ 19,950,000	£ 22,950,000	$ 31,636,000	$ 37,343,000	1,138,000,000	1,205,000,000	$ 17,512,000	$ 18,748,000	157,000,000	171,000,000	$ 45,916,000	$ 52,821,000
Average contract rate			0.8249	0.8649			1.2633	1.2840			1.5858	1.6271			0.0154	0.0156			0.2925	0.3089