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Summarized Financial Information of Unconsolidated Joint Ventures (Sales, Profit, and Income) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]      
Net sales $ 48,259us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 52,982us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 63,297us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Gross profit (loss) 14,277us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss 15,214us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss 17,280us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
Net income (loss) $ 8,246us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 8,652us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 9,486us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss