Fair Value Measurement - Effect of Derivative Instruments on Consolidated Statements of Income for Derivatives Not Designated as Accounting Hedges (Detail) - Cost of Revenues - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivatives	$ 4	$ 607
Interest rate swap agreement
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivatives	$ (1,818)	$ 785