Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 28,463us-gaap_Revenues	$ 26,874us-gaap_Revenues	$ 25,241us-gaap_Revenues	$ 22,344us-gaap_Revenues	$ 21,558us-gaap_Revenues	$ 19,517us-gaap_Revenues	$ 17,843us-gaap_Revenues	$ 16,682us-gaap_Revenues	$ 102,922us-gaap_Revenues	$ 75,600us-gaap_Revenues	$ 57,033us-gaap_Revenues
Gross margin	17,797us-gaap_GrossProfit	17,336us-gaap_GrossProfit	17,201us-gaap_GrossProfit	14,740us-gaap_GrossProfit	14,249us-gaap_GrossProfit	12,697us-gaap_GrossProfit	11,014us-gaap_GrossProfit	10,393us-gaap_GrossProfit	67,074us-gaap_GrossProfit	48,353us-gaap_GrossProfit	35,686us-gaap_GrossProfit
Loss from operations	(1,950)us-gaap_OperatingIncomeLoss	(2,355)us-gaap_OperatingIncomeLoss	(416)us-gaap_OperatingIncomeLoss	(1,358)us-gaap_OperatingIncomeLoss	(2,849)us-gaap_OperatingIncomeLoss	(1,842)us-gaap_OperatingIncomeLoss	(2,438)us-gaap_OperatingIncomeLoss	(2,331)us-gaap_OperatingIncomeLoss	(6,079)us-gaap_OperatingIncomeLoss	(9,460)us-gaap_OperatingIncomeLoss	(26,527)us-gaap_OperatingIncomeLoss
Income from discontinued operations, net of income taxes	2,163	332	308	348	555	665	802	761	3,151	2,783	2,491
Net loss attributable to Rentrak Corporation	$ 1,639us-gaap_NetIncomeLoss	$ (2,287)us-gaap_NetIncomeLoss	$ (374)us-gaap_NetIncomeLoss	$ (966)us-gaap_NetIncomeLoss	$ (2,087)us-gaap_NetIncomeLoss	$ (343)us-gaap_NetIncomeLoss	$ (633)us-gaap_NetIncomeLoss	$ (1,191)us-gaap_NetIncomeLoss	$ (1,988)us-gaap_NetIncomeLoss	$ (4,254)us-gaap_NetIncomeLoss	$ (22,617)us-gaap_NetIncomeLoss
Loss per share from continuing operations attributable to Rentrak Corporation:
Basic (usd per share)	$ (0.03)	$ (0.19)	$ (0.06)	$ (0.11)	$ (0.22)	$ (0.08)	$ (0.12)	$ (0.16)	$ (0.38)	$ (0.59)	$ (2.14)
Diluted (usd per share)	$ (0.03)	$ (0.19)	$ (0.06)	$ (0.11)	$ (0.22)	$ (0.08)	$ (0.12)	$ (0.16)	$ (0.38)	$ (0.59)	$ (2.14)
Income per share from discontinued operations attributable to Rentrak Corporation common stockholders:
Basic (usd per share)	$ 0.14	$ 0.02	$ 0.03	$ 0.03	$ 0.05	$ 0.05	$ 0.07	$ 0.06	$ 0.23	$ 0.24	$ 0.21
Diluted (usd per share)	$ 0.13	$ 0.02	$ 0.03	$ 0.03	$ 0.05	$ 0.05	$ 0.07	$ 0.06	$ 0.23	$ 0.24	$ 0.21
Net loss per share attributable to Rentrak Corporation common stockholders:
Basic (usd per share)	$ 0.11us-gaap_EarningsPerShareBasic	$ (0.17)us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.08)us-gaap_EarningsPerShareBasic	$ (0.17)us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.05)us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic	$ (0.35)us-gaap_EarningsPerShareBasic	$ (1.93)us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ 0.10us-gaap_EarningsPerShareDiluted	$ (0.17)us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.08)us-gaap_EarningsPerShareDiluted	$ (0.17)us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.05)us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted	$ (0.15)us-gaap_EarningsPerShareDiluted	$ (0.35)us-gaap_EarningsPerShareDiluted	$ (1.93)us-gaap_EarningsPerShareDiluted
Diluted shares outstanding	16,331								13,508	12,177	11,733

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