Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill	$ 77,265,907	$ 62,712,109
On Assignment [Member]
Business Acquisition [Line Items]
Other current assets	61,837
Property and equipment	160,921
Goodwill	14,553,798
Other intangible assets	14,000,000
Other assets	52,444
Total assets acquired	28,829,000
Accrued employee compensation and benefits	111,789
Total liabilities assumed	111,789
Net assets acquired	$ 28,717,211