Equity and Cost Method Businesses - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012 Marketable Securities	Dec. 31, 2012 Prepaid expenses and other current assets	Dec. 31, 2013 Anthem	Dec. 31, 2012 Bolt	Dec. 27, 2012 Bolt	Sep. 30, 2012 Bolt	Dec. 31, 2011 Bolt
Schedule Of Equity Method Investments [Line Items]
Net asset of equity method	$ 1,300,000		$ 15,300,000
Net asset allocated of equity method goodwill	600,000		12,000,000
Allocated of equity method intangible	700,000		3,300,000
Amortized period	5 years
Amortization of intangible assets	165,000	[1]	1,154,000	[2]	2,018,000	[3]
Acquired preferred stock										9,000,000
Equity method investment, ownership percentage									9.00%		53.00%	38.00%	26.00%
Purchased preferred stock										13,200,000
Carrying value of holdings in cost method companies	19,600,000		13,000,000
Fair value of active common stock remaining			$ 700,000				$ 300,000	$ 400,000

[1] Includes Acquirgy, CIML, Freeborders (through October 18, 2013, the date of disposition) and WhiteFence (through October 28, 2013, the date of disposition).

[2] Includes Acquirgy, Bolt (through December 27, 2012, the date of consolidation), CIML (through July 11, 2012, the date of consolidation), Freeborders, GoIndustry (through July 5, 2012, the date of disposition) and WhiteFence.

[3] Includes Acquirgy, Bolt, CIML, ClickEquations (through June 14, 2011, the date of disposition), Freeborders, GoIndustry, Metastorm (through February 17, 2011, the date of disposition), StarCite (through December 30, 2011, the date of disposition) and WhiteFence.