Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013 Subsidiaries	Jan. 31, 2013 Investor Force	Jun. 30, 2014 Investor Force	Jun. 30, 2013 Investor Force	Feb. 20, 2013 Channel Intelligence	Jun. 30, 2013 Channel Intelligence	Dec. 04, 2013 Procurian	Jun. 30, 2014 Procurian	Dec. 31, 2013 Procurian
Subsidiary Or Equity Method Investee [Line Items]
Number of subsidiaries sold					3
Consideration from divestiture of business						$ 23,600,000			$ 125,000,000		$ 375,000,000
Consideration from sale of business in cash						20,800,000			60,500,000		327,800,000
Gain on sale of business							2,100,000	15,700,000		17,800,000			224,900,000
Income (loss) from discontinued operations, including gain on sale, net of tax	1,315,000	2,448,000	1,363,000	30,674,000								100,000
Income tax benefit on loss from discontinued operations	$ (800,000)	$ 400,000		$ 200,000