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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)

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