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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, 2019
Dec. 31, 2018
Deferred tax assets:    
Accrued compensation and benefits $ 1,180 $ 1,387
Inventory valuation reserves 2,384 2,256
Allowance for doubtful accounts 473 346
Benefit plan reserves 7,586 7,153
Net operating loss carryforwards 3,003 2,651
Other accrued expenses 3,012 2,830
Unrealized foreign exchange 718 1,217
Gross deferred tax assets 18,356 17,840
Valuation allowance (3,137) (3,495)
Net deferred tax assets 15,219 14,345
Deferred tax liabilities:    
Depreciation and other basis differences (6,867) (6,855)
Intangibles (3,742) (2,057)
Undistributed foreign earnings 0 (172)
Other (162) (72)
Deferred tax liabilities (10,771) (9,156)
Net deferred tax assets 4,448 5,189
Deferred income tax expense    
Ordinary movement 1,275 (993)
Deferred tax balances from business acquisition (1,883) 0
Tax impact deferred rate 0 680
Items of other comprehensive income (loss) (62) (62)
Currency translation (71) (120)
Total change in net deferred tax assets $ (741) $ (495)