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Investments - Components of Company's Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Jun. 30, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | $ 261 | $ 4,962
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (13) | (245)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value | 4,712 |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses | (288) |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 4,973 | 4,962
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (301) | (245)
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 | 95 | 135
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (5) | (52)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 95 | 135
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (5) | (52)
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 |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (5) |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 163 |
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (5) |
Offshore fund [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 4,811
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (189)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value | 4,712 |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses | (288) |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 4,712 | 4,811
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | (288) | (189)
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 | 3 | 16
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | (3) | (4)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total | 3 | 16
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | $ (3) | $ (4)

X
- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + 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=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=6872113&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=6872113&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 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 7 -URI http://asc.fasb.org/extlink&oid=6872113&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=6872113&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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