Derivatives and Hedging Instruments - Summary of Effects of Derivatives on Cash Flow Hedging Relationships in Company's Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) Recognized in OCI - Effective Portion	$ 0	$ 222
Foreign Currency Exchange Contracts 1 [Member]
Derivative [Line Items]
Gain or (Loss) Recognized in OCI - Effective Portion	1,885	601
Foreign Currency Exchange Contracts 2 [Member]
Derivative [Line Items]
Gain or (Loss) Recognized in OCI - Effective Portion	187	103
Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) Reclassified from OCI into Income - Effective Portion	0	0
Salaries and Employee Benefits [Member] | Foreign Currency Exchange Contracts 1 [Member]
Derivative [Line Items]
Gain or (Loss) Reclassified from OCI into Income - Effective Portion	(356)	(49)
General and Administrative Expenses [Member] | Foreign Currency Exchange Contracts 2 [Member]
Derivative [Line Items]
Gain or (Loss) Reclassified from OCI into Income - Effective Portion	(57)	(9)
Other (expense) income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0
Other (expense) income [Member] | Foreign Currency Exchange Contracts 1 [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0
Other (expense) income [Member] | Foreign Currency Exchange Contracts 2 [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing	$ 0	$ 0