Consolidated Core Companies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended				1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended										1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 30, 2012	Jun. 30, 2013 Additional Paid-In Capital	Jun. 30, 2012 Additional Paid-In Capital	Jun. 30, 2013 Non- Controlling Interest	Jun. 30, 2012 Non- Controlling Interest	Feb. 20, 2013 Channel Intelligence	Jun. 30, 2013 Channel Intelligence	Jun. 30, 2013 Channel Intelligence	Dec. 31, 2012 Channel Intelligence	Jan. 31, 2013 Investorforce	Jun. 30, 2012 Investorforce	Jun. 30, 2013 Investorforce	Jun. 30, 2012 Investorforce	Dec. 31, 2012 Investorforce	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum	Mar. 30, 2012 MSDSonline	Jun. 29, 2012 Procurian	Jun. 30, 2013 Procurian Media Iq Llc	Jun. 29, 2012 Procurian Media Iq Llc	Jul. 31, 2012 Procurian Utilities Analyses Inc	Dec. 27, 2012 Bolt	Dec. 27, 2012 Bolt Minimum	Dec. 27, 2012 Bolt Maximum
Subsidiary Or Equity Method Investee [Line Items]
Percentage of business acquisition					96.00%																96.00%
Total Acquisition price																								$ 11,500,000
Common shares purchased																						4,000,000
Deferred cash payment																							1,000,000	2,000,000
Deferred cash payment due on one year anniversary of the transaction																								1,000,000
Deferred cash payment due on two year anniversary of the transaction																								1,000,000
Cash paid for acquisition																									6,700,000
Additional equity ownership acquired																										13,200,000
Equity method investment, ownership percentage																			20.00%	50.00%							38.00%	53.00%
Consideration from divestiture of business										125,000,000				23,600,000
Consideration from sale of business in cash										60,500,000				20,800,000
Gain on sale of business												17,800,000				15,700,000
Revenue											3,100,000				2,300,000	800,000	4,200,000
Net income loss	100,000	(292,000)	27,696,000	(966,000)							2,100,000				200,000	400,000	800,000
Assets of discontinued operations													7,100,000					3,400,000
Liabilities of discontinued operations													6,500,000					3,900,000
Goodwill in discontinued operations											48,895,000	48,895,000						700,000
Proceeds from sales/distributions of ownership interests	73,400,000		73,469,000	15,913,000
Impact of subsidiary equity transactions			$ 1,526,000	$ (794,000)		$ 1,477,000	$ (1,918,000)	$ 49,000	$ 1,124,000