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Quarterly Financial Information - Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 96,179 us-gaap_SalesRevenueNet | $ 102,100 us-gaap_SalesRevenueNet | $ 99,981 us-gaap_SalesRevenueNet | $ 89,925 us-gaap_SalesRevenueNet | $ 98,543 us-gaap_SalesRevenueNet | $ 100,828 us-gaap_SalesRevenueNet | $ 111,716 us-gaap_SalesRevenueNet | $ 98,689 us-gaap_SalesRevenueNet |  |  |
Gross profit | 29,848 us-gaap_GrossProfit | 32,455 us-gaap_GrossProfit | 31,197 us-gaap_GrossProfit | 27,448 us-gaap_GrossProfit | 30,393 us-gaap_GrossProfit | 31,660 us-gaap_GrossProfit | 37,549 us-gaap_GrossProfit | 31,299 us-gaap_GrossProfit | 120,948 us-gaap_GrossProfit | 130,901 us-gaap_GrossProfit | 144,438 us-gaap_GrossProfit
Income before income taxes | 4,373 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 5,294 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 7,606 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 4,137 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 5,653 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 8,544 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 10,680 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,917 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 21,410 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 31,794 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 44,827 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income | $ 2,488 us-gaap_ProfitLoss | $ 2,555 us-gaap_ProfitLoss | $ 5,080 us-gaap_ProfitLoss | $ 2,738 us-gaap_ProfitLoss | $ 3,132 us-gaap_ProfitLoss | $ 6,104 us-gaap_ProfitLoss | $ 6,386 us-gaap_ProfitLoss | $ 4,965 us-gaap_ProfitLoss | $ 12,861 us-gaap_ProfitLoss | $ 20,587 us-gaap_ProfitLoss | $ 29,286 us-gaap_ProfitLoss
Net income, basic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.48 us-gaap_EarningsPerShareBasic | $ 0.94 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 1.14 us-gaap_EarningsPerShareBasic | $ 1.19 us-gaap_EarningsPerShareBasic | $ 0.92 us-gaap_EarningsPerShareBasic | $ 2.39 us-gaap_EarningsPerShareBasic | $ 3.84 us-gaap_EarningsPerShareBasic | $ 5.50 us-gaap_EarningsPerShareBasic
Net income, diluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.94 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 1.12 us-gaap_EarningsPerShareDiluted | $ 1.17 us-gaap_EarningsPerShareDiluted | $ 0.91 us-gaap_EarningsPerShareDiluted | $ 2.39 us-gaap_EarningsPerShareDiluted | $ 3.77 us-gaap_EarningsPerShareDiluted | $ 5.45 us-gaap_EarningsPerShareDiluted

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