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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities purchased $ 2,535 $ 251
Marketable securities matured $ 2,000 $ 250
Weighted average maturity 4 months 9 days  
Minimum [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities maturity period 9 days  
Maximum [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities maturity period 9 months 18 days