Equity and Cost Method Businesses - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Schedule Of Equity Method Investments [Line Items]
Net asset of equity method			$ 1,300,000
Equity compensation arrangement			600,000
Allocated of equity method intangible			700,000
Amortized period			5 years
Amortization of intangible assets	144,000	[1]	165,000	[2]	1,154,000
Carrying value of holdings in cost method companies	17,700,000		20,400,000
Available for sale securities	0		0
Anthem
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	9.00%		9.00%
Less Than
Schedule Of Equity Method Investments [Line Items]
Amortization of intangible assets	$ 100,000		$ 200,000		$ 1,200,000

[1] Includes Acquirgy and CIML (through September 30, 2014, the date of disposition).

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