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Investments - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Equity in earnings (losses), net of taxes $ (116,000) $ 77,000  
Grupo Vasconia S.A.B.      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership in equity method investment 30.00%    
Exchange rate at period end - MXN to USD 19.41   19.64
Increase (Decrease) in equity method investment $ 300,000 700,000  
Equity in earnings (losses), net of taxes 116,000 77,000  
Equity in earnings, deferred taxes 200,000 $ 200,000  
Fair value of investment 32,700,000   $ 31,900,000
Carrying value of investment 22,200,000   22,600,000
Grupo Vasconia S.A.B. | Prepaid expenses and other current assets      
Schedule of Equity Method Investments [Line Items]      
Due from related party 130,000   95,000
Grupo Vasconia S.A.B. | Accounts payable and accrued expenses      
Schedule of Equity Method Investments [Line Items]      
Due to related party $ 33,000   $ 0
Grupo Vasconia S.A.B. | Transaction 02      
Schedule of Equity Method Investments [Line Items]      
Average daily exchange rate for period - MXN to USD 19.24 18.71