Other Noncurrent Liabilities - Summary of Other Noncurrent Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Reserve for uncertain tax positions	$ 232	$ 1,717
OPEB	855	985
Insurance claims and expenses	641	653
Other	396	425
Total	$ 2,124	$ 3,780