Other Noncurrent Liabilities - Summary of Other Noncurrent Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Reserve for uncertain tax positions	$ 1,717	$ 1,717
OPEB	900	985
Insurance claims and expenses	593	653
Other	463	425
Total	$ 3,673	$ 3,780