Assets Segregated for Regulatory Purposes (Narrative) (Detail) (USD $)	Jun. 30, 2014	Jun. 30, 2013
Disclosure Assets Segregated For Regulatory Purposes Narrative [Abstract]
Cash segregated in special reserve bank accounts	$ 190,240,000	$ 164,737,000
Reserve deposits in special reserve bank account for PAIB	$ 0	$ 0

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 305

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

Name:	us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant