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Investments - Summary of Gross Unrealized Losses and Fair Values of Available-For-Sale Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | $ 264 | $ 261
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (11) | (13)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value | 4,778 | 4,712
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses | (222) | (288)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 5,042 | 4,973
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (233) | (301)
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | 97 | 95
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (3) | (5)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 97 | 95
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (3) | (5)
Venture Capital Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | 163 | 163
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (5) | (5)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 163 | 163
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (5) | (5)
Offshore Fund [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value | 4,778 | 4,712
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses | (222) | (288)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 4,778 | 4,712
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (222) | (288)
Mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | 4 | 3
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (3) | (3)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 4 | 3
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | $ (3) | $ (3)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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