Forward Contracts with Notional Values (Detail) (Forward Contracts) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013 Euro EUR (€)	Jun. 30, 2014 Euro EUR (€)	Jun. 30, 2013 Euro EUR (€)	Jun. 30, 2013 British pound GBP (£)	Jun. 30, 2014 British pound GBP (£)	Jun. 30, 2013 British pound GBP (£)	Jun. 30, 2014 Australian Dollar AUD	Jun. 30, 2014 Indian Rupees INR
Derivative [Line Items]
Notional amount	€ 16,500	€ 21,900	€ 32,500	£ 14,500	£ 26,500	£ 33,500	12,900	204,000