Regulatory Requirements - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015 USD ($)
Regulatory Capital Requirements [Abstract]
Minimum net capital required	$ 5,000
Description of minimum net capital requirements	The greater of $5,000 or 1/15 of aggregate indebtedness
Minimum net capital requirements (percent)	6.67%
Net capital	$ 4,600,000
Excess net capital	$ 4,300,000
Aggregate indebtedness to net capital ratio (percent)	0.8