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Investment in Joint Venture - Summarized Income Statement Information of Unconsolidated Joint Venture (Detail) - Joint Venture [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Net sales $ 18,003 $ 19,111
Cost of sales 15,147 14,436
Income from operations 2,508 4,411
Net income $ 1,952 $ 3,689