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Acquisition of Kantar Media's U.S. Based Television Measurement Assets - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Dec. 01, 2014	Dec. 31, 2014	Mar. 31, 2014	Mar. 31, 2013
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 136,127us-gaap_Goodwill	$ 7,034us-gaap_Goodwill	$ 4,998us-gaap_Goodwill
RPD Business [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable	821
Goodwill	129,406
Total assets acquired	135,227
Accounts Payable	(543)
Deferred revenue	(71)
Total liabilities acquired	(614)
Net assets acquired	134,613
Customer Relationships [Member] \| RPD Business [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Customer relationships	$ 5,000
Customer relationships, useful life	10 years