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

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