Ownership Interests and Cost Method Companies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Net asset of equity method	$ 15,300,000		$ 28,400,000
Net asset allocated of equity method goodwill	12,000,000		19,000,000
Allocated of equity method intangible	3,300,000		9,400,000
Amortization expense for intangible assets	1,154,000	[1]	2,018,000	[2]	2,656,000	[3]
Impairment charges					2,914,000
Fair value of active common stock remaining	300,000
Carrying value of holdings in cost method companies	13,000,000		10,800,000
Payment to acquire equity ownership interests in cost method companies			9,500,000		800,000
Proceeds from escrow releases	2,400,000		1,600,000		1,900,000
Ice
Schedule of Equity Method Investments [Line Items]
Value of shares of common stock remaining in escrow	100,000
Active
Schedule of Equity Method Investments [Line Items]
Number of shares of common stock remaining in escrow	11,650
Anthem
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	9.00%
Distributions received			1,900,000
GoIndustry
Schedule of Equity Method Investments [Line Items]
Impairment charges					2,914,000	[3]
Equity method investment, ownership percentage			26.00%
SeaPass
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	53.00%		26.00%
SeaPass | Transaction One
Schedule of Equity Method Investments [Line Items]
Acquired preferred stock	9,000,000
SeaPass | Transaction Two
Schedule of Equity Method Investments [Line Items]
Acquired preferred stock	$ 13,200,000
Minimum
Schedule of Equity Method Investments [Line Items]
Amortized period	3 years
Equity method investment, ownership percentage	20.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Amortized period	7 years
Equity method investment, ownership percentage	50.00%

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

[2] Includes Acquirgy, CIML, ClickEquations (to June 14, 2011, the date of its disposition), Freeborders, GoIndustry, Metastorm (to February 17, 2011, the date of disposition), SeaPass, StarCite (to December 30, 2011, the date of its disposition) and WhiteFence.

[3] Includes Acquirgy, CIML, ClickEquations, Freeborders, GoIndustry, Metastorm, SeaPass, StarCite and WhiteFence.