Supplementary Information - Summary of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Pension and other post retirement liabilities	$ 15,226	$ 14,497
Deferred tax liabilities	8,138	8,028
Other long-term liabilities	9,277	5,242
Total	$ 32,641	$ 27,767

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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