Outstanding Hedge Transactions Not Qualifying for Hedge Accounting (Detail) (Non Qualifying, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
USD | Foreign Exchange Option
Derivative [Line Items]
Amount	$ 0	$ 5,000
USD | Foreign Exchange Forward
Derivative [Line Items]
Amount	64,400	64,150
JPY | Foreign Exchange Forward
Derivative [Line Items]
Amount	0	3
GBP | Foreign Exchange Forward
Derivative [Line Items]
Amount	6,098	8,566
CAD | Foreign Exchange Forward
Derivative [Line Items]
Amount	5,723	0
INR | Foreign Exchange Forward
Derivative [Line Items]
Amount	$ 2,433	$ 0