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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)

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