v2.4.1.9
Computation of Basic and Diluted Earnings (loss) Per Share (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
Earnings Loss Per Share [Line Items]                      
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 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
Total weighted average common stock shares outstanding                 11,301us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,300us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,995us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Employee stock options                 55us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 179us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Adjusted weighted average shares                 11,356us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,301us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,174us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings (loss) per share                      
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
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 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 earnings (loss) per share:                      
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
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 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]
Class A                      
Earnings Loss Per Share [Line Items]                      
Total weighted average common stock shares outstanding                 9,246us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 9,073us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 8,768us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Convertible                      
Earnings Loss Per Share [Line Items]                      
Total weighted average common stock shares outstanding                 2,055us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 2,227us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 2,227us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
[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.