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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Construction in progress $ 3,122 $ 2,639
Land 100 100
Property plant and equipment gross 127,882 123,925
Less: accumulated depreciation and amortization (104,817) (102,794)
Total 23,065 21,131
Machinery, Furniture and Equipment    
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross 91,282 89,545
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross 32,591 30,019
Building and Improvements    
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross $ 787 $ 1,622