Forward Contracts with Notional Values (Detail) - Forward Contracts € in Thousands, ₨ in Thousands, £ in Thousands, AUD in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 AUD	Dec. 31, 2015 INR (₨)	Dec. 31, 2015 EUR (€)	Dec. 31, 2014 GBP (£)	Dec. 31, 2014 AUD	Dec. 31, 2014 INR (₨)	Dec. 31, 2014 EUR (€)	Dec. 31, 2013 GBP (£)	Dec. 31, 2013 AUD	Dec. 31, 2013 INR (₨)	Dec. 31, 2013 EUR (€)
Euro Member Countries, Euros
Derivative [Line Items]
Notional amount | €					€ 55,850				€ 21,900				€ 102,300
British Pounds
Derivative [Line Items]
Notional amount | £		£ 13,600				£ 26,500				£ 85,400
Australian Dollar
Derivative [Line Items]
Notional amount | AUD			AUD 43,000				AUD 12,900				AUD 26,300
Indian Rupees
Derivative [Line Items]
Notional amount | ₨				₨ 1,100,000				₨ 204,000				₨ 690,000
United States of America, Dollars
Derivative [Line Items]
Notional amount | $	$ 77,900