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Investments - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
$ / $
Jun. 30, 2017
USD ($)
$ / $
Jun. 30, 2018
USD ($)
$ / $
Jun. 30, 2017
USD ($)
$ / $
Dec. 31, 2017
USD ($)
$ / $
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (losses), net of taxes $ 155,000 $ 458,000 $ 232,000 $ 998,000  
Grupo Vasconia S.A.B.          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership in equity method investment 30.00%   30.00%    
Exchange rate at period end - MXN to USD | $ / $ 19.88   19.88   19.68
Increase (decrease) in equity method investment     $ 1,100,000 1,800,000  
Due to related party $ 0   0   $ 0
Equity in earnings (losses), net of taxes 155,000 458,000 232,000 998,000  
Equity in earnings, deferred taxes 501,000 $ 140,000 306,000 $ 365,000  
Fair value of investment 32,200,000   32,200,000   31,800,000
Carrying value of investment 23,300,000   23,300,000   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 $ 100,000   $ 100,000   $ 64,000
Grupo Vasconia S.A.B. | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | $ / $ 19.38 18.54      
Grupo Vasconia S.A.B. | Minimum | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | $ / $     18.71 18.54  
Grupo Vasconia S.A.B. | Maximum | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | $ / $     19.38 20.30