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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Accrued compensation and benefits $ 1,199 $ 1,358  
Inventory valuation reserves 3,080 2,849  
Allowance for doubtful accounts 335 316  
Benefit plan reserves 10,878 11,331  
Net operating loss carryforwards 3,851 2,751  
Tax credit carryforwards 534 745  
Other accrued expenses 2,350 2,226  
Unrealized foreign exchange 3,179 1,805  
Gross deferred tax assets 25,406 23,381  
Valuation allowance (5,209) (3,614)  
Net deferred tax assets 20,197 19,767  
Depreciation and other basis differences (5,841) (5,814)  
Intangibles (2,959) (3,706)  
Undistributed foreign earnings (1,094) (444)  
Other (67) (65)  
Deferred tax liabilities (9,961) (10,029)  
Net deferred tax assets 10,236 9,738  
Deferred income tax benefit 944 1,697 $ 1,105
Items of other comprehensive (loss) (464)    
Items of other comprehensive income   3,109  
Currency translation 18 140  
Deferred tax balances from business acquisition 0 (2,025)  
Total change in net deferred tax assets $ 498 $ 2,921