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Supplemental Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Statement of Operations Data |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 203,021 us-gaap_SalesRevenueNet | $ 186,798 us-gaap_SalesRevenueNet | $ 184,697 us-gaap_SalesRevenueNet | $ 206,353 us-gaap_SalesRevenueNet | $ 204,394 us-gaap_SalesRevenueNet | $ 166,453 us-gaap_SalesRevenueNet | $ 156,928 us-gaap_SalesRevenueNet | $ 141,645 us-gaap_SalesRevenueNet | $ 780,869 us-gaap_SalesRevenueNet | $ 669,420 us-gaap_SalesRevenueNet | $ 643,508 us-gaap_SalesRevenueNet
Gross profit | 89,434 us-gaap_GrossProfit | 79,325 us-gaap_GrossProfit | 79,635 us-gaap_GrossProfit | 89,372 us-gaap_GrossProfit | 87,680 us-gaap_GrossProfit | 62,234 us-gaap_GrossProfit | 61,958 us-gaap_GrossProfit | 54,702 us-gaap_GrossProfit | 337,766 us-gaap_GrossProfit | 266,574 us-gaap_GrossProfit | 269,479 us-gaap_GrossProfit
Income from operations | 38,554 us-gaap_OperatingIncomeLoss | 28,150 us-gaap_OperatingIncomeLoss | 30,660 us-gaap_OperatingIncomeLoss | 37,778 us-gaap_OperatingIncomeLoss | 30,952 us-gaap_OperatingIncomeLoss | 12,332 us-gaap_OperatingIncomeLoss | 10,427 us-gaap_OperatingIncomeLoss | 4,676 us-gaap_OperatingIncomeLoss | 135,142 us-gaap_OperatingIncomeLoss | 58,387 us-gaap_OperatingIncomeLoss | 74,223 us-gaap_OperatingIncomeLoss
Net income | $ 34,192 us-gaap_NetIncomeLoss | $ 29,117 us-gaap_NetIncomeLoss | $ 21,224 us-gaap_NetIncomeLoss | $ 31,245 us-gaap_NetIncomeLoss | $ 20,237 us-gaap_NetIncomeLoss | $ 2,458 us-gaap_NetIncomeLoss | $ 7,320 us-gaap_NetIncomeLoss | $ 5,761 us-gaap_NetIncomeLoss | $ 115,778 us-gaap_NetIncomeLoss | $ 35,776 us-gaap_NetIncomeLoss | $ 48,029 us-gaap_NetIncomeLoss
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.64 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.58 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ 0.14 us-gaap_EarningsPerShareBasic | $ 0.11 us-gaap_EarningsPerShareBasic | $ 2.17 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.91 us-gaap_EarningsPerShareBasic
Diluted | $ 0.64 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 2.16 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.90 us-gaap_EarningsPerShareDiluted
Cash dividends paid per common share | $ 0.165 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.165 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.165 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.160 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.655 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.640 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.620 us-gaap_CommonStockDividendsPerShareCashPaid

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