Non-Controlling Interest in Subsidiary - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended		12 Months Ended				0 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 20, 2012 Entity One	Aug. 17, 2011 Entity One	Dec. 31, 2012 Entity One	Dec. 31, 2011 Entity One	Aug. 15, 2011 Entity One	Aug. 17, 2011 Entity One Software	Dec. 10, 2012 Pricing Engine Inc.
Noncontrolling Interest [Line Items]
Discretionary contribution limit to fund operating expenses													$ 2,000,000.0
Amount of capital contributed immediately													1,000,000.0
Equity method investment, equity interest																50.00%		17.40%
Percentage of ownership interest, equity method													75.00%
Percentage of ownership interest by other investor													25.00%
Fair value of non-controlling interest													1,200,000
Finite-Lived Computer Software, Gross																	210,000
Fair market value gain on revaluation of non-controlling interest													169,000
Equity interest of the investor	0				536,000				0	536,000		471,000	588,000		536,000
Cash contributed to acquired equity investment												500,000
Net loss attributable to non-controlling interest	0	0	20,000	45,000	30,000	22,000	0	0	65,000	52,000	0			65,000	52,000,000
Ownership percentage of the subsidiary												100.00%
Cash paid for equity investment									$ 1,500,000	$ 0	$ 500,000							$ 1,000,000.0