Consolidated Businesses - Preliminary Allocation of Consideration Paid and Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
	Nov. 03, 2014	Nov. 03, 2014	Mar. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill				$ 265,677	$ 265,084
Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life				5 years
FolioDynamix
Consideration:
Cash consideration (including $0.7 million of working capital adjustment paid in 2015)		$ 201,699
Fair value of stock options of FolioDynamix		4,125
Business acquisition, consideration transferred		205,824
Recognized amounts of identifiable assets acquired and liabilities assumed:
Financial assets	$ 9,324	9,324
Property, plant and equipment	1,581	1,581
Financial liabilities	(14,397)	(14,397)
Contingent consideration	(1,870)	(1,870)
Deferred tax liability	(1,585)	(1,585)
Total identifiable net assets	39,653	39,653
Goodwill	166,171	166,171
Purchase price allocation assets acquired	$ 205,824	205,824
FolioDynamix | Customer lists
Business Acquisition [Line Items]
Finite intangible assets, useful life	10 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Intangible assets	$ 23,300	23,300
FolioDynamix | Trademarks/trade names
Business Acquisition [Line Items]
Finite intangible assets, useful life	5 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Intangible assets	$ 8,100	8,100
FolioDynamix | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life	8 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Intangible assets	$ 15,200	$ 15,200
Scenario, Adjustment | FolioDynamix
Recognized amounts of identifiable assets acquired and liabilities assumed:
Working capital adjustment	$ 700		$ 700