Forward Contracts with Notional Values (Detail) - Forward Contracts € in Thousands, ₨ in Thousands, £ in Thousands, AUD in Thousands, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 GBP (£)	Sep. 30, 2015 AUD	Sep. 30, 2015 INR (₨)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 GBP (£)	Sep. 30, 2015 AUD	Sep. 30, 2015 INR (₨)	Sep. 30, 2014 EUR (€)	Sep. 30, 2014 GBP (£)	Sep. 30, 2014 AUD	Sep. 30, 2014 INR (₨)
Euro
Derivative [Line Items]
Notional amount		€ 33,309					€ 33,309				€ 21,900
British pound
Derivative [Line Items]
Notional amount | £			£ 10,300					£ 10,300				£ 26,500
Australian Dollar
Derivative [Line Items]
Notional amount | AUD				AUD 27,000					AUD 27,000				AUD 12,900
Indian Rupees
Derivative [Line Items]
Notional amount | ₨					₨ 300,000					₨ 300,000				₨ 204,000
United States Dollar
Derivative [Line Items]
Notional amount | $	$ 45,500					$ 45,500