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Investments - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / $
Mar. 31, 2017
USD ($)
$ / $
Dec. 31, 2017
USD ($)
$ / $
Schedule of Equity Method Investments [Line Items]      
Equity in earnings (losses), net of taxes $ 77,000 $ 540,000  
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 | $ / $ 18.16   19.68
Increase in equity method investment $ 700,000 1,300,000  
Equity in earnings (losses), net of taxes 77,000 500,000  
Equity in earnings, deferred taxes 200,000 $ 200,000  
Fair value of investment 35,900,000   $ 31,800,000
Carrying value of investment 24,300,000   23,800,000
Grupo Vasconia S.A.B. | Prepaid expenses and other current assets      
Schedule of Equity Method Investments [Line Items]      
Due from related party 112,000   64,000
Grupo Vasconia S.A.B. | Accounts payable and accrued expenses      
Schedule of Equity Method Investments [Line Items]      
Due to related party $ 7,000   $ 0
Grupo Vasconia S.A.B. | Transaction 02      
Schedule of Equity Method Investments [Line Items]      
Average daily exchange rate for period - MXN to USD | $ / $ 18.71 20.30