Foreign Currency Hedging (Schedule of Foreign Currency Exchange Contracts Designated as Cash Flow Hedges) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Fair Value	$ (7,646)	$ (8,871)
Derivative, Notional Amount	92,114	111,614
Eurodollar Sell Forward Contract 1.240 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.240
Eurodollar Sell Forward Contract 1.270 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.270
Eurodollar Sell Forward Contract 1.281 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.281
Eurodollar Sell Forward Contract 1.300 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.300
Euro Forward Contracts [Member] | Eurodollar Sell Forward Contract 1.240 [Member]
Derivative [Line Items]
Fair Value	(1,197)	(1,207)
Derivative, Notional Amount	10,850	10,850
Euro Forward Contracts [Member] | Eurodollar Sell Forward Contract 1.270 [Member]
Derivative [Line Items]
Fair Value	(3,710)	(3,760)
Derivative, Notional Amount	44,450	44,450
Euro Forward Contracts [Member] | Eurodollar Sell Forward Contract 1.281 [Member]
Derivative [Line Items]
Fair Value	(2,739)	(2,785)
Derivative, Notional Amount	36,814	36,814
Euro Forward Contracts [Member] | Eurodollar Sell Forward Contract 1.300 [Member]
Derivative [Line Items]
Fair Value	0	(1,119)
Derivative, Notional Amount	$ 0	$ 19,500