Derivative Instruments and Hedging Activities - Open Foreign Currency Contracts (Detail) - Cash Flow Hedging - Foreign exchange contracts, net - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	$ 74,355	$ 128,541
Net Unrealized Gain (Loss)	3,128	(426)
Australian Dollar
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	0	24,250
Net Unrealized Gain (Loss)	0	(134)
Canadian Dollar
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	55,133	94,292
Net Unrealized Gain (Loss)	2,564	(159)
Mexican Peso
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	19,222	9,999
Net Unrealized Gain (Loss)	$ 564	$ (133)