Investments - Summary of Gross Unrealized Losses and Fair Values of Available-For-Sale Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	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	$ 880	$ 261
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(34)	(13)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	4,712
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0	(288)
Available-for-sale securities, continuous unrealized loss position, fair value, total	880	4,973
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(34)	(301)
Common stock - Domestic
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	200
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(4)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	200
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(4)
Common stock - International
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	107	95
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(5)	(5)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	107	95
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(5)	(5)
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	27
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(17)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	27
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(17)
Offshore fund
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value		0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss		0
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 longer, gross unrealized loss		(288)
Available-for-sale securities, continuous unrealized loss position, fair value, total		4,712
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total		(288)
Mutual funds - Fixed income
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	371
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(3)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	371
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(3)
Mutual funds - Domestic equity
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	116
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(2)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	116
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(2)
Other
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	59	166
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(3)	(8)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	59	166
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	$ (3)	$ (8)