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Income Taxes - Tax Effects of Temporary Differences That Give Rise to the Company's Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Accrued compensation and benefits $ 1,518 $ 1,180
Inventory valuation reserves 2,535 2,384
Allowance for doubtful accounts 480 473
Benefit plan reserves 7,564 7,586
Net operating loss carryforwards 1,851 3,003
Other accrued expenses 3,825 3,012
Unrealized foreign exchange 799 718
Other 284 0
Gross deferred tax assets 18,856 18,356
Valuation allowance (2,912) (3,137)
Net deferred tax assets 15,944 15,219
Deferred tax liabilities:    
Depreciation and other basis differences (4,514) (6,867)
Intangibles (3,419) (3,742)
Other (69) (162)
Deferred tax liabilities (8,002) (10,771)
Net deferred tax assets 7,942 4,448
Deferred income tax expense    
Ordinary movement 3,380 1,275
Deferred tax balances from business acquisition 0 (1,883)
Items of other comprehensive income (loss) 319 (62)
Currency translation (205) (71)
Total change in net deferred tax assets $ 3,494 $ (741)