Summary of Significant Accounting Policies (Details 4) (USD $)	12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011 BuyEfficient, LLC	Jan. 31, 2011 BuyEfficient, LLC	Dec. 31, 2012 BuyEfficient, LLC Maximum	Dec. 31, 2012 BuyEfficient, LLC Minimum
Goodwill
Ownership interest acquired (as a percent)			50.00%	50.00%
Goodwill
Balance at the beginning of the period	$ 990,000	$ 9,405,000
Purchase of outside 50% equity interest in BuyEfficient	8,415,000		8,400,000
Balance at the end of the period	9,405,000	9,405,000
Goodwill included in assets held for sale, net	$ 3,700,000	$ 3,700,000
Expected Life at Acquisition					20 years	7 years