Net Capital Requirements and Customer Protection Requirements - Additional Information (Detail) (USD $)	Jun. 30, 2013
Brokers And Dealers [Abstract]
Minimum net capital required	$ 100,000
Percentage of aggregate indebtedness	0.0667

Amount of minimum net capital required to be maintained to engage in securities transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Rule 15c3

-Number 240

-Section 1

-Paragraph 1

-Subparagraph i

-Article 15c3

-Subsection a

Name:	us-gaap_MinimumNetCapitalRequired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant