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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended
Jun. 30, 2017
USD ($)
Lease
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Commitments And Contingencies Disclosure [Abstract]      
Rent expense for office space $ 3,400,000 $ 3,400,000 $ 3,500,000
Leases expiration year 2021    
Period of extended lease term 1 year    
Monthly base rent for second year $ 100,000    
Monthly base rent for third year $ 200,000    
Percent of rent base increase 3.00%    
Lease term began Nov. 01, 2010    
Lease term expires Oct. 31, 2018    
Number of times lease term can be extended | Lease 2    
Estimated fair value of indemnification agreements $ 0 0  
Estimated fair value of indemnity provisions $ 0 $ 0