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Investment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Equity Method Investments And Joint Ventures [Abstract]          
Equity method investment, ownership percentage 20.20%us-gaap_EquityMethodInvestmentOwnershipPercentage   20.20%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Total carrying value of investment $ 12,296us-gaap_EquityMethodInvestments   $ 12,296us-gaap_EquityMethodInvestments   $ 11,589us-gaap_EquityMethodInvestments
Pro-rata share of earnings $ 200us-gaap_IncomeLossFromEquityMethodInvestments $ 100us-gaap_IncomeLossFromEquityMethodInvestments $ 707us-gaap_IncomeLossFromEquityMethodInvestments $ 517us-gaap_IncomeLossFromEquityMethodInvestments