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Fair Value Disclosures - Additional Information (Detail) (USD $)	3 Months Ended
	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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Percentage of financial assets derived from Level 1 inputs measured at fair value.

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Percentage of financial assets derived from Level 3 inputs measured at fair value.

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Percentage of financial assets derived from Level 2 inputs measured at fair value.

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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)

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-Name Accounting Standards Codification

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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.

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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).

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The aggregate value of all restricted investments.

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-Topic 946

-SubTopic 320

-Section S99

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-Name Regulation S-X (SX)

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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