Discontinued Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2013 Subsidiaries	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2013 Investor Force	Dec. 31, 2013 Investor Force	Dec. 31, 2012 Investor Force	Feb. 20, 2013 Channel Intelligence	Dec. 31, 2013 Channel Intelligence	Dec. 31, 2012 Channel Intelligence	Dec. 04, 2013 Procurian	Dec. 31, 2013 Procurian
Subsidiary Or Equity Method Investee [Line Items]
Number of subsidiaries sold	3
Consideration from divestiture of business				$ 23.6			$ 125.0			$ 375.0
Consideration from sale of business in cash				20.8			60.5			327.8
Gain on sale of business					15.7			17.8			224.9
Income tax expense (benefit) on income (loss) from discontinued operations	20.4	(5.1)	(6.4)
Deferred tax assets in discontinued operations											12.2
Noncurrent assets						$ 1.0			$ 72.2		$ 74.3