Financial Derivatives - Outstanding Foreign Currency Forward Contracts and Options (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Option Contracts [Member] | US Dollars/Philippine Pesos [Member]
Derivative [Line Items]
Notional Amount	$ 70,000	$ 74,000
Settle Through Date	Dec. 31, 2020	Dec. 31, 2020
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Forwards [Member] | US Dollars/Costa Rican Colones [Member]
Derivative [Line Items]
Notional Amount	$ 45,000	$ 42,000
Settle Through Date	Dec. 31, 2020	Dec. 31, 2020
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Forwards [Member] | Euros/Hungarian Forints [Member]
Derivative [Line Items]
Notional Amount	$ 2,575
Settle Through Date	Dec. 31, 2020
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Forwards [Member] | Euros/Romanian Leis [Member]
Derivative [Line Items]
Notional Amount	$ 10,951
Settle Through Date	Dec. 31, 2020
Derivatives Not Designated as Hedging Instruments under ASC 815 [Member] | Forwards [Member]
Derivative [Line Items]
Notional Amount	$ 11,102	$ 19,295
Settle Through Date	Nov. 30, 2021	Nov. 30, 2021