Fair Value Disclosures - Summary of Investments Measured at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Common stock
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Beginning Balance	$ 95	$ 0
Total unrealized gains (losses)
Included in earnings (investment income)	0	0
Included in other comprehensive income	(1)	0
Purchases	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	94	0
Preferred stock
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Beginning Balance	0	0
Total unrealized gains (losses)
Included in earnings (investment income)	0	0
Included in other comprehensive income	(6)	0
Purchases	97	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	91	0
Corporate debt
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Beginning Balance	0	0
Total unrealized gains (losses)
Included in earnings (investment income)	0	0
Included in other comprehensive income	0	0
Purchases	250	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	250	0
Venture capital investments
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Beginning Balance	163	168
Total unrealized gains (losses)
Included in earnings (investment income)	0	0
Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	$ 163	$ 168