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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)