Foreign Currency Hedging (Schedule of Foreign Currency Exchange Contracts Designated as Cash Flow Hedges) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative, Notional Amount	$ 111,614	$ 210,667
Fair Value	(8,871)	(7,581)
Eurodollar Sell Forward Contract 1.230 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.230
Derivative, Notional Amount	0	27,553
Fair Value	0	(2,036)
Eurodollar Sell Forward Contract 1.240 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.240
Derivative, Notional Amount	10,850	10,850
Fair Value	(1,207)	(726)
Eurodollar Sell Forward Contract 1.270 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.270
Derivative, Notional Amount	44,450	44,450
Fair Value	(3,760)	(1,950)
Eurodollar Sell Forward Contract 1.281 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.281
Derivative, Notional Amount	36,814	36,814
Fair Value	(2,785)	(1,331)
Eurodollar Sell Forward Contract 1.300 [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	1.300
Derivative, Notional Amount	19,500	91,000
Fair Value	$ (1,119)	$ (1,538)