Investments - Summary of Gross Unrealized Losses and Fair Values of Available-For-Sale Investment Securities (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
In Thousands, unless otherwise specified | 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) |