Financial Derivatives - Outstanding Foreign Currency Forward Contracts and Options (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Option Contracts [Member] | Philippine Pesos [Member]
Derivative [Line Items]
Notional Amount	$ 71,750	$ 73,000
Settle Through Date	Dec. 31, 2016	Dec. 31, 2015
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Forwards [Member] | Philippine Pesos [Member]
Derivative [Line Items]
Notional Amount		$ 9,000
Settle Through Date		Mar. 31, 2015
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Forwards [Member] | Costa Rican Colones [Member]
Derivative [Line Items]
Notional Amount	$ 34,500	$ 51,600
Settle Through Date	Nov. 30, 2016	Oct. 31, 2015
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Forwards [Member] | Romanian Leis [Member]
Derivative [Line Items]
Notional Amount		$ 10,414
Settle Through Date		Dec. 31, 2015
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Net Investment Hedges [Member] | Forwards [Member] | Euros [Member]
Derivative [Line Items]
Notional Amount	$ 63,470	$ 51,648
Settle Through Date	Mar. 31, 2016	Mar. 31, 2016
Derivatives Not Designated as Hedging Instruments under ASC 815 [Member] | Forwards [Member]
Derivative [Line Items]
Notional Amount	$ 50,603	$ 64,541
Settle Through Date	Mar. 31, 2016	Mar. 31, 2015