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Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Dec. 08, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Common stock, par value		$ 0.0005		$ 0.0005
Weighted average useful life of acquired intangible assets				10 years
Goodwill		$ 161,753		$ 161,753
Acquisition related income tax benefit adjustment for pro forma purpose			$ 12,239
Advertising Business [Member]
Business Acquisition [Line Items]
Assets and liabilities disposed value				0
Amortization Expense [Member]
Business Acquisition [Line Items]
Business acquisitions pro forma adjustments			2,508
Interest Expense [Member]
Business Acquisition [Line Items]
Business acquisitions pro forma adjustments			1,828
Share Based Compensation Expense [Member]
Business Acquisition [Line Items]
Business acquisitions pro forma adjustments			$ 31,663
Information Services [Member]
Business Acquisition [Line Items]
Goodwill		42,623		42,623
Performance Marketing [Member]
Business Acquisition [Line Items]
Goodwill		$ 119,130		$ 119,130
Customer Relationship [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets		7 years		7 years
Trademarks [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets		20 years		20 years
Domain Names [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets		20 years		20 years
Developed Technology [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets		5 years		5 years
Databases [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets		10 years		10 years
Non-competition Agreements [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets		5 years		5 years
Fluent Acquisition [Member]
Business Acquisition [Line Items]
Percentage of outstanding stocks acquired				100.00%
Convertible preferred stock conversion into common stock				15,001,850
Common stock, par value				$ 0.0005
Fair value of converted common stock				$ 123,800
Acquisition price, cash	$ 99,289			$ 99,300
Goodwill	$ 156,526	$ 156,526
Fluent Acquisition [Member] | Information Services [Member]
Business Acquisition [Line Items]
Goodwill		37,396
Fluent Acquisition [Member] | Performance Marketing [Member]
Business Acquisition [Line Items]
Goodwill		$ 119,130
Fluent Acquisition [Member] | Series B Preferred Stock [Member]
Business Acquisition [Line Items]
Issuance of convertible preferred stock as a result of acquisition				300,037
Convertible preferred stock, par value				$ 0.0001

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