Acquisitions - Additional Information (Detail) (USD $)				1 Months Ended		1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 30, 2012 EnerGov Solutions, L.L.C. [Member]	Mar. 31, 2013 EnerGov Solutions, L.L.C. [Member]	Apr. 30, 2012 CSA [Member]	Mar. 31, 2012 UniFund, L.L.C. [Member]	Jan. 31, 2012 Akanda Innovation, Inc. [Member]	Dec. 31, 2011 Akanda Innovation, Inc. [Member]	Oct. 31, 2011 Windsor Management Group, L.L.C. [Member]
Business Acquisition [Line Items]
Cash acquired from acquisition				$ 15,000		$ 437,000	$ 780,000			$ 7,400,000
Purchase price in cash				10,500,000		9,400,000	4,600,000	2,100,000	900,000	16,400,000
Common stock shares value at acquisition				60,000
Common stock value at acquisition date				2,800,000
Purchase price allocation goodwill amount	121,011,000	121,011,000	106,094,000		1,100,000
Total Purchase price								2,900,000
Liabilities assumed in acquisition								$ 800,000