Benefit Plans - Summary of Contributions to Retirement Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	$ 303	$ 167	$ 562	$ 428
US Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	184	158	356	396
Foreign Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	$ 119	$ 9	$ 206	$ 32