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Related Party Transactions - Additional Information (Details) (USD $) | 12 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Related Party Transaction [Line Items] |  |  |  |  |
Advisory fees | $ 7,760,000 |  | $ 12,189,000 |  | $ 14,933,000
Trading, fair value | 17,817,000 | [1] | 4,758,000 | [1] |
Available-for-sale securities, fair value | 6,196,000 | [2],[3] | 9,053,000 | [2],[3] |
USGIF and offshore clients [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fair Value investment included in Cash and Cash Equivalents and trading securities | 19,400,000 |  | 29,700,000 |  |
Dividend income | 132,000 |  | 114,000 |  | 117,000
Unrealized gain (losses) on related party securities | (143,000) |  | (147,000) |  | 50,000
Chief Executive Officer, Trustee of USGIF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment advisory fees receivable | 1,300,000 |  | 964,000 |  |
Charlemagne Capital Limited [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Available-for-sale securities, fair value | 1,300,000 |  |  |  |
Offshore fund [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of funds to which Company provides advisory services | 2 |  |  |  |
Trading, fair value | 998,000 | [1] | 786,000 | [1] |
Available-for-sale securities, fair value |  |  | 4,712,000 | [3] |
Offshore fund [Member] | Chief Executive Officer, Director of Meridian Offshore Funds [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Advisory fees | 194,000 |  | 318,000 |  | 358,000
Offshore fund [Member] | Energy and natural resource sectors [Member] | Significant Other Inputs (Level 2) [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Trading, fair value |  |  | $ 786,000 |  |
[1] | Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.
[2] | Net unrealized gains on available-for-sale securities gross and net of tax as of June 30, 2014, are $1,345 and $888, respectively, and as of June 30, 2013, are $988 and $652, respectively.
[3] | Unrealized gains and losses on available-for-sale securities are excluded from earnings and recorded in other comprehensive income (loss) as a separate component of shareholders’ equity until realized.

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- Definition Advisory Services, Number of Funds Services are Provided + References No definition available. + Details
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- Definition Investment Advisory, Management and Administrative Fees Receivable + References No definition available. + Details
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- Definition Investment in related party. + References No definition available. + Details
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- Definition Unrealized gain losses on related party securities. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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