Other Income (Loss) - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Schedule Of Equity Method Investments [Line Items]
Gains on sales/distributions of ownership interests	$ 1,700,000	$ 1,700,000
Number of Shares Distributed has Escrowed Proceeds Related to the Disposition of a Former Company	12,989	12,989
CIML
Schedule Of Equity Method Investments [Line Items]
Gain on fair value upon consolidation of Channel Intelligence	26,563,000	26,563,000
Metastorm
Schedule Of Equity Method Investments [Line Items]
Escrowed proceeds received		$ 200,000