Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jan. 31, 2013 Investorforce	Sep. 30, 2012 Investorforce	Sep. 30, 2013 Investorforce	Sep. 30, 2012 Investorforce	Dec. 31, 2012 Investorforce	Feb. 20, 2013 Channel Intelligence	Sep. 30, 2013 Channel Intelligence	Sep. 30, 2012 Channel Intelligence	Sep. 30, 2013 Channel Intelligence	Dec. 31, 2012 Channel Intelligence	Dec. 31, 2012 Channel Intelligence Developed Technology	Dec. 31, 2012 Channel Intelligence Licensing And Servicing Agreements	Dec. 31, 2012 Channel Intelligence Trademarks, trade names and domain names	Dec. 31, 2012 Channel Intelligence Customer Relationships	Sep. 30, 2013 Procurian	Sep. 30, 2012 Procurian	Sep. 30, 2013 Procurian	Sep. 30, 2012 Procurian	Jun. 30, 2013 Procurian	Dec. 31, 2012 Procurian
Subsidiary Or Equity Method Investee [Line Items]
Consideration from divestiture of business					$ 23,600,000					$ 125,000,000													$ 324,000,000
Consideration from sale of business in cash					20,800,000					60,500,000											375,000,000
Gain on sale of business							15,700,000						17,800,000
Revenue						2,100,000	800,000	6,300,000			3,100,000	5,100,000							33,900,000	37,500,000	103,400,000	105,400,000
Income (loss) from discontinued operations, including gain on sale, net of tax	4,474,000	1,595,000	33,991,000	7,411,000		300,000	400,000	1,100,000			2,100,000	1,700,000							1,700,000	2,200,000	4,100,000	7,000,000
Assets held for sale / assets of discontinued operations									3,400,000					7,100,000					71,100,000		71,100,000			72,800,000
Liabilities held for sale / liabilities of discontinued operations									3,900,000					6,500,000					22,100,000		22,100,000			30,600,000
Goodwill in discontinued operations									700,000					48,895,000					30,500,000		30,500,000			30,500,000
Discontinued operation, intangible amortization												700,000
Intangible assets														22,434,000	2,710,000	3,519,000	6,683,000	9,522,000	10,900,000		10,900,000			12,100,000
Proceeds from sales/distributions of ownership interests			73,469,000	20,525,000
Noncurrent assets of discontinued operations																			14,700,000		14,700,000			19,500,000
Noncurrent liabilities of discontinued operations																			16,700,000		16,700,000			22,900,000
Deferred tax assets in discontinued operations																			$ 15,900,000		$ 15,900,000			$ 12,200,000