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Business Combinations - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Mar. 31, 2012
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Purchase price net of cash acquired	$ 0	$ 42,369	$ 157,430
Goodwill	159,342us-gaap_Goodwill	159,342us-gaap_Goodwill	129,428us-gaap_Goodwill	159,342us-gaap_Goodwill
Weighted average useful life (in years)	5 years
Lemon Inc
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash paid for acquisition				42,369
Purchase price net of cash acquired				3,315
Goodwill		29,914		29,914
Intangible assets acquired		3,880		3,880
Net assets acquired		3,184		3,184
Lemon Inc \| Technology
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Intangible assets acquired		3,290		3,290
Weighted average useful life (in years)				6 years
Lemon Inc \| Customer relationships
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Intangible assets acquired		530		530
Lemon Inc \| Trade name and trademarks
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Intangible assets acquired		60		60
ID Analytics
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash paid for acquisition					166,474
Purchase price net of cash acquired					157,430
Goodwill					129,428
Intangible assets acquired					57,500
Weighted average useful life (in years)					7 years 7 months 6 days
Net liabilities assumed					978
ID Analytics \| Technology
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Intangible assets acquired					33,000
ID Analytics \| Customer relationships
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Intangible assets acquired					20,500
ID Analytics \| Trade name and trademarks
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Intangible assets acquired					4,000
ID Analytics \| Consumer Segment
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Goodwill					69,891
ID Analytics \| Enterprise Segment
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Goodwill					59,537
ID Analytics \| Series E One Preferred Stock
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Number of shares issued at the acquisition					1,586,778
Fair value of the shares issued at the acquisition					$ 19,476