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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred tax assets: |  |  |
Accrued compensation and benefits | $ 1,250 | $ 1,199 |
Inventory valuation reserves | 3,422 | 3,080 |
Allowance for doubtful accounts | 471 | 335 |
Benefit plan reserves | 11,130 | 10,878 |
Net operating loss carryforwards | 3,358 | 3,851 |
Tax credit carryforwards | 0 | 534 |
Other accrued expenses | 2,445 | 2,350 |
Unrealized foreign exchange | 2,812 | 3,179 |
Gross deferred tax assets | 24,888 | 25,406 |
Valuation allowance | (3,805) | (5,209) |
Net deferred tax assets | 21,083 | 20,197 |
Deferred tax liabilities: |  |  |
Depreciation and other basis differences | (8,341) | (5,841) |
Intangibles | (2,887) | (2,959) |
Undistributed foreign earnings | (1,642) | (1,094) |
Other | (83) | (67) |
Deferred tax liabilities | (12,953) | (9,961) |
Net deferred tax assets | 8,130 | 10,236 |
Change in net deferred tax assets: |  |  |
Deferred income tax expense | (2,249) | 944 | $ 1,697
Items of other comprehensive (loss) | (48) | (464) |
Currency translation | 191 | 18 |
Total change in net deferred tax assets | $ (2,106) | $ 498 |

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