Supplementary Information - Summary of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Pension and other post retirement liabilities	$ 14,825	$ 14,497
Deferred tax liabilities	8,068	8,028
Other liabilities	9,963	5,242
Total	$ 32,856	$ 27,767