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Schedule of Fair Value of Financial Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets $ 150,445 $ 225,405
Money Market Funds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 3,065 [1] 13,634 [1]
Corporate Bonds And Notes
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 46,660 44,474
Municipal Bonds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 85,634 144,158
Federal Agency Issues
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 15,086 23,139
Level 1
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 3,065 13,634
Level 1 | Money Market Funds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 3,065 [1] 13,634 [1]
Level 2
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 147,380 211,771
Level 2 | Corporate Bonds And Notes
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 46,660 44,474
Level 2 | Municipal Bonds
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets 85,634 144,158
Level 2 | Federal Agency Issues
    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Total fair value of financial assets $ 15,086 $ 23,139
[1] Money market funds are primarily comprised of exchange traded funds and accrued interest