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Fair Value Disclosures - Additional Information (Detail) (USD $) | 3 Months Ended
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Sep. 30, 2013
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Percentage of financial assets derived from Level 1 inputs measured at fair value | 55.00%
Percentage of financial assets derived from Level 2 inputs measured at fair value | 43.00%
Percentage of financial assets derived from Level 3 inputs measured at fair value | 2.00%
Trading securities, at fair value | $ 4,867,000
Available-for-sale securities, at fair value | 8,224,000
Fair value of investment in restricted shares | 97,000
Offshore Fund [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Trading securities, at fair value | 902,000
Available-for-sale securities, at fair value | 4,778,000
Offshore Fund [Member] | Significant Other Inputs (Level 2) [Member] | Energy And Natural Resources Sectors [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Trading securities, at fair value | 902,009
Offshore Fund [Member] | Significant Other Inputs (Level 2) [Member] | Dividend Paying Equity And Debt Securities [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Available-for-sale securities, at fair value | 4,778,290
Venture Capital Investments [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Available-for-sale securities, at fair value | 163,000
Venture Capital Investments [Member] | Medical And Medical Technology Sectors [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Commitments | 62,500
Venture Capital Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Medical And Medical Technology Sectors [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Available-for-sale securities, at fair value | $ 162,841
Available-for-sale Securities [Member] | Offshore Fund [Member] | Significant Other Inputs (Level 2) [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Redemption description of investment | First business day of each month after providing a redemption notice at least forty-five days prior to the proposed redemption date.
Trading Securities [Member] | Offshore Fund [Member] | Significant Other Inputs (Level 2) [Member] |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Redemption description of investment | First business day of each month after providing a redemption notice at least forty-five days prior to the proposed redemption date.

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- Definition Percentage of financial assets derived from Level 1 inputs measured at fair value. + References No definition available. + Details
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- Definition Percentage of financial assets derived from Level 3 inputs measured at fair value. + 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 Describes the terms and conditions for redemption of the entity's investment, or portion thereof (for example, quarterly redemption with 60 days notice), for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258 + Details
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- Definition The aggregate value of all restricted investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.9(c)) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.6(c)) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 9 -Subparagraph c -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 6 -Subparagraph c -Article 12 + 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 -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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