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Fair Value Disclosures - Fair Value Measurements on Recurring Basis (Detail) (USD $) | Sep. 30, 2013
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | $ 4,867,000
Total available-for-sale securities | 8,224,000
Total Investments | 13,091,000
Common Stock [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 23,000
Total available-for-sale securities | 1,739,000
Offshore Fund [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 902,000
Total available-for-sale securities | 4,778,000
Mutual funds [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 3,942,000
Total available-for-sale securities | 1,544,000
Venture Capital Investments [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total available-for-sale securities | 163,000
Quoted Prices (Level 1) [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 3,965,000
Total available-for-sale securities | 3,186,000
Total Investments | 7,151,000
Quoted Prices (Level 1) [Member] | Common Stock [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 23,000
Total available-for-sale securities | 1,642,000
Quoted Prices (Level 1) [Member] | Offshore Fund [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities |
Quoted Prices (Level 1) [Member] | Mutual funds [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 3,942,000
Total available-for-sale securities | 1,544,000
Quoted Prices (Level 1) [Member] | Venture Capital Investments [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total available-for-sale securities |
Significant Other Inputs (Level 2) [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 902,000
Total available-for-sale securities | 4,778,000
Total Investments | 5,680,000
Significant Other Inputs (Level 2) [Member] | Common Stock [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities |
Significant Other Inputs (Level 2) [Member] | Offshore Fund [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities | 902,000
Total available-for-sale securities | 4,778,000
Significant Other Inputs (Level 2) [Member] | Mutual funds [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities |
Significant Other Inputs (Level 2) [Member] | Venture Capital Investments [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total available-for-sale securities |
Significant Unobservable Inputs (Level 3) [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities | 260,000
Total Investments | 260,000
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities | 97,000
Significant Unobservable Inputs (Level 3) [Member] | Offshore Fund [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities |
Significant Unobservable Inputs (Level 3) [Member] | Mutual funds [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total trading securities |
Total available-for-sale securities |
Significant Unobservable Inputs (Level 3) [Member] | Venture Capital Investments [Member] | Recurring basis [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Total available-for-sale securities | $ 163,000

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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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