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Fair Value Disclosures - Summary of Investments Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Common Stock [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Beginning Balance $ 95   
Return of capital      
Total gains or losses (realized/unrealized)    
Included in earnings (investment income)      
Included in other comprehensive income 2   
Purchases, sales, issuances, and settlements      
Transfers in and/or out of Level 3      
Ending Balance 97   
Venture Capital Investments [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Beginning Balance 163 168
Return of capital      
Total gains or losses (realized/unrealized)    
Included in earnings (investment income)      
Included in other comprehensive income      
Purchases, sales, issuances, and settlements      
Transfers in and/or out of Level 3      
Ending Balance $ 163 $ 168