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
	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)