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Calculations of Net Income (Loss) Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic and Diluted:    
Income (loss) from continuing operations $ (14,765)us-gaap_IncomeLossFromContinuingOperations $ (10,198)us-gaap_IncomeLossFromContinuingOperations
Income (loss) from discontinued operations   48us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income (loss) attributable to Actua Corporation $ (14,765)us-gaap_NetIncomeLoss $ (10,150)us-gaap_NetIncomeLoss
Income (loss) from continuing operations per share $ (0.40)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare $ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Income (loss) from discontinued operations per share   $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare
Net income (loss) attributable to Actua Corporation per share $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted $ (0.27)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computation of basis and diluted income (loss) per share 36,842us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 37,096us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted