Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail) In Thousands, unless otherwise specified	Jun. 30, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / U.S. Dollar [Member] USD ($)	Dec. 31, 2013 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / U.S. Dollar [Member] USD ($)	Jun. 30, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] U.S. Dollar / Canadian Dollar [Member] CAD	Dec. 31, 2013 Cash Flow Hedges [Member] Designated as Hedging [Member] U.S. Dollar / Canadian Dollar [Member] CAD	Jun. 30, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / Philippine Peso [Member] PHP	Jun. 30, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] British Pound / Philippine Peso [Member] PHP	Jun. 30, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / British Pound [Member] GBP (£)	Jun. 30, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / U.S. Dollar [Member] EUR (€)	Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / U.S. Dollar [Member] EUR (€)	Jun. 30, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] EUR (€)	Jun. 30, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] GBP (£)	Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] EUR (€)	Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] GBP (£)	Jun. 30, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Canadian Dollar / U.S Dollar [Member] CAD	Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Canadian Dollar / U.S Dollar [Member] CAD	Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S Dollar / Euro [Member] USD ($)	Jun. 30, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S. Dollar / British Pound [Member] USD ($)	Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S. Dollar / British Pound [Member] USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sell (Buy) Notional	$ (26,348)	$ (27,105)	(9,449)	(13,007)	(510,705)	(207,955)	£ (3,468)	€ 8,000	€ 9,000	€ 4,000	£ (9,000)	€ 5,000	£ (8,000)	2,000	2,000	$ 2,000	$ 7,000	$ 6,000