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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