Other noncurrent liabilities - Summary of Other Noncurrent Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Other noncurrent liabilities
Reserve for uncertain tax positions	$ 1,724	$ 1,724
OPEB	702	787
Insurance claims and expenses	590	632
Other	327	347
Total	$ 3,343	$ 3,490