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Summarized Financial Information of Unconsolidated Joint Ventures (Sales, Profit, and Income) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Net sales | $ 54,597 | $ 47,321 | $ 43,438
Gross profit | 21,462 | 16,829 | 11,993
Net income | $ 9,796 | $ 8,292 | $ 5,753

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