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Fair Value Disclosures - Additional Information (Detail) (USD $) | 3 Months Ended
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Dec. 31, 2013
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Percentage of financial assets derived from Level 1 inputs measured at fair value | 91.00%
Change in unrealized gain (loss) | $ 0
Significant Other Inputs (Level 2) |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Percentage of financial assets derived from Level 2 inputs measured at fair value | 7.00%
Significant Unobservable Inputs (Level 3) |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Percentage of financial assets derived from Level 3 inputs measured at fair value | 2.00%
Offshore fund | Significant Other Inputs (Level 2) | Energy and natural resources sectors |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Trading securities, at fair value | 877,108
Venture capital investments | Medical and medical technology sectors |
Fair Value Assets Liabilities Quantitative Information [Line Items] |
Fair value investment entities calculating net asset value per share unfunded commitments | $ 62,500
Available-for-sale securities | Offshore fund | Significant Other Inputs (Level 2) |
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 | Offshore fund | Significant Other Inputs (Level 2) |
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 Percentage of financial assets derived from Level 2 inputs measured at fair value. + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + 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 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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