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Statement of Operations Information (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
Schedule Of Quarterly Financial Information [Line Items]                      
Revenues $ 148,871us-gaap_Revenues $ 151,202us-gaap_Revenues $ 141,853us-gaap_Revenues $ 137,904us-gaap_Revenues $ 165,881us-gaap_Revenues $ 141,919us-gaap_Revenues $ 137,905us-gaap_Revenues $ 130,183us-gaap_Revenues $ 579,830us-gaap_Revenues $ 575,888us-gaap_Revenues $ 565,724us-gaap_Revenues
Gross profit 117,236us-gaap_GrossProfit 116,249us-gaap_GrossProfit 106,240us-gaap_GrossProfit 104,895us-gaap_GrossProfit 132,912us-gaap_GrossProfit 108,666us-gaap_GrossProfit 101,459us-gaap_GrossProfit 94,282us-gaap_GrossProfit 444,620us-gaap_GrossProfit 437,319us-gaap_GrossProfit 424,648us-gaap_GrossProfit
(Loss) income from continuing operations, net of tax 22,699us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (845)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (10,337)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (6,482)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 16,148us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 17,146us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (1,553)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (5,191)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 5,035us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 26,550us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 22,473us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Discontinued operations, net of tax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 56,782us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 56,782us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (1,927)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net (loss) income $ 22,699us-gaap_NetIncomeLoss $ (845)us-gaap_NetIncomeLoss $ (10,337)us-gaap_NetIncomeLoss $ (6,482)us-gaap_NetIncomeLoss $ 16,148us-gaap_NetIncomeLoss $ 17,146us-gaap_NetIncomeLoss $ (1,553)us-gaap_NetIncomeLoss $ 51,591us-gaap_NetIncomeLoss $ 5,035us-gaap_NetIncomeLoss $ 83,332us-gaap_NetIncomeLoss $ 20,546us-gaap_NetIncomeLoss
(Loss) earnings per share:                      
Basic, from continuing operations $ 2.01us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.07)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.91)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.57)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.43us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.52us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.46)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.45us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.35us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic, from discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 5.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 5.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.18)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic (loss) earnings per share $ 2.01us-gaap_EarningsPerShareBasic [1] $ (0.07)us-gaap_EarningsPerShareBasic [1] $ (0.91)us-gaap_EarningsPerShareBasic [1] $ (0.57)us-gaap_EarningsPerShareBasic [1] $ 1.43us-gaap_EarningsPerShareBasic [1] $ 1.52us-gaap_EarningsPerShareBasic [1] $ (0.14)us-gaap_EarningsPerShareBasic [1] $ 4.57us-gaap_EarningsPerShareBasic [1] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 7.37us-gaap_EarningsPerShareBasic [1],[2] $ 1.87us-gaap_EarningsPerShareBasic [2]
Diluted, from continuing operations $ 1.99us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.07)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.91)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.57)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.43us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.52us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.46)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.44us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.35us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.01us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted, from discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 5.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 5.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.17)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted (loss) earnings per share $ 1.99us-gaap_EarningsPerShareDiluted [1] $ (0.07)us-gaap_EarningsPerShareDiluted [1] $ (0.91)us-gaap_EarningsPerShareDiluted [1] $ (0.57)us-gaap_EarningsPerShareDiluted [1] $ 1.43us-gaap_EarningsPerShareDiluted [1] $ 1.52us-gaap_EarningsPerShareDiluted [1] $ (0.14)us-gaap_EarningsPerShareDiluted [1] $ 4.57us-gaap_EarningsPerShareDiluted [1] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 7.37us-gaap_EarningsPerShareDiluted [1],[2] $ 1.84us-gaap_EarningsPerShareDiluted [2]
[1] The sum of the basic and diluted earnings (loss) per share for the four quarters may differ from annual earnings (loss) per share as the weighted-average shares outstanding are computed independently for each of the quarters presented.
[2] Basic and fully diluted earnings (loss) per share for class A and class B common stock are the same.