Derivatives and Hedging Instruments - Summary of the Effects of Derivatives in Cash Flow Hedging Relationships in the Company's Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest rate swaps [Member]
Derivative [Line Items]
Gain or (Loss) Recognized in OCI - Effective Portion	$ 151	$ 140	$ 374	$ (71)
Foreign currency exchange contracts 1 [Member]
Derivative [Line Items]
Gain or (Loss) Recognized in OCI - Effective Portion	(2,540)	(3,120)	(1,938)	(2,200)
Foreign currency exchange contracts 2 [Member]
Derivative [Line Items]
Gain or (Loss) Recognized in OCI - Effective Portion	(531)	(510)	(428)	(204)
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
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
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
Interest expense [Member] | Interest rate swaps [Member]
Derivative [Line Items]
Gain or (Loss) Reclassified from OCI into Income - Effective Portion
Salaries and employee benefits [Member] | Foreign currency exchange contracts 1 [Member]
Derivative [Line Items]
Gain or (Loss) Reclassified from OCI into Income - Effective Portion	(219)	(442)	(268)	(557)
General and administrative expenses [Member] | Foreign currency exchange contracts 2 [Member]
Derivative [Line Items]
Gain or (Loss) Reclassified from OCI into Income - Effective Portion	$ (44)	$ (78)	$ (52)	$ (95)