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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, 2017 | Dec. 31, 2016
Deferred tax assets: |  |
Accrued compensation and benefits | $ 1,093 | $ 1,250
Inventory valuation reserves | 2,332 | 3,422
Allowance for doubtful accounts | 360 | 471
Benefit plan reserves | 7,981 | 11,130
Net operating loss carryforwards | 3,402 | 3,358
Other accrued expenses | 2,489 | 2,445
Unrealized foreign exchange | 1,462 | 2,812
Gross deferred tax assets | 19,119 | 24,888
Valuation allowance | (3,965) | (3,805)
Net deferred tax assets | 15,154 | 21,083
Deferred tax liabilities: |  |
Depreciation and other basis differences | (6,313) | (8,341)
Intangibles | (2,706) | (2,887)
Undistributed foreign earnings | (426) | (1,642)
Other | (25) | (83)
Deferred tax liabilities | (9,470) | (12,953)
Net deferred tax assets | 5,684 | 8,130
Deferred income tax expense |  |
Ordinary movement | (473) | (2,249)
Tax act - transition tax | 1,198 | 0
Tax impact deferred rate | (3,161) | 0
Items of other comprehensive (loss) |  | (48)
Items of other comprehensive income | 48 |
Currency translation | (58) | 191
Total change in net deferred tax assets | $ (2,446) | $ (2,106)

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