Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) revenue_source customer	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($) customer
Significant Accounting Policies [Line Items]
Impairment of intangible assets	$ 0
Impairment of cost method investment	0	$ 0	$ 0
Goodwill impairment loss	0
Restricted cash	400,000	400,000
Deferred revenue	36,800,000
Interest paid	0	0
Income tax payments	200,000	200,000	$ 2,000,000
Fixed assets purchased	100,000	0
Redeemable noncontrolling interests	5,858,000	10,506,000
Decrease in additional paid-in capital	(3,578,204,000)	(3,563,848,000)
Decrease in noncontrolling interests	$ (12,144,000)	$ (14,866,000)
Revenue | Customer concentration risk
Significant Accounting Policies [Line Items]
Number of customers represented for more than 10% of consolidated revenue | customer	0	0	0
Restatement adjustment | Correction of error, recognition of permanent equity
Significant Accounting Policies [Line Items]
Redeemable noncontrolling interests			$ 4,100,000
Decrease in additional paid-in capital			1,400,000
Decrease in noncontrolling interests			$ 2,700,000
FolioDynamix
Significant Accounting Policies [Line Items]
Goodwill impairment loss		$ 39,700,000
Initial subscription arrangement, minimum (in years)	3 years
Initial subscription arrangement, maximum (in years)	5 years
Deferred revenue	$ 4,100,000
Bolt
Significant Accounting Policies [Line Items]
Subscription period (in months)	1 month
VelocityEHS
Significant Accounting Policies [Line Items]
Initial subscription arrangement, minimum (in years)	1 year
Initial subscription arrangement, maximum (in years)	3 years
Number of sources of revenues | revenue_source	2
Channel Intelligence
Significant Accounting Policies [Line Items]
Proceeds from escrow releases	$ 11,300,000