Property and Equipment (Detail) (USD $)			12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Computer Equipment [Member]	Dec. 31, 2012 Computer Equipment [Member]	Dec. 31, 2013 Computer Equipment [Member] Minimum [Member]	Dec. 31, 2013 Computer Equipment [Member] Maximum [Member]	Dec. 31, 2013 Computer software [Member]	Dec. 31, 2012 Computer software [Member]	Dec. 31, 2013 Computer software [Member] Minimum [Member]	Dec. 31, 2013 Computer software [Member] Maximum [Member]	Dec. 31, 2013 Office Equipment [Member]	Dec. 31, 2012 Office Equipment [Member]	Dec. 31, 2013 Office Equipment [Member] Minimum [Member]	Dec. 31, 2013 Office Equipment [Member] Maximum [Member]	Dec. 31, 2013 Furniture and Fixtures [Member]	Dec. 31, 2012 Furniture and Fixtures [Member]	Dec. 31, 2013 Furniture and Fixtures [Member] Minimum [Member]	Dec. 31, 2013 Furniture and Fixtures [Member] Maximum [Member]	Dec. 31, 2013 Leasehold Improvements [Member]	Dec. 31, 2012 Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life			3 years	7 years			3 years	5 years			3 years	5 years			5 years	7 years			5 years	7 years
Property and equipment	$ 50,949,101	$ 50,152,583			$ 12,115,305	$ 12,373,042			$ 30,059,145	$ 29,929,913			$ 3,306,824	$ 3,307,815			$ 1,751,669	$ 1,704,073			$ 3,716,158	$ 2,837,740
Less accumulated depreciation and amortization	(44,778,602)	(41,917,771)
Property and equipment, net of accumulated depreciation and amortization	$ 6,170,499	$ 8,234,812