Long-Term Debt - Summary of Payments Applicable to Reduction of Principal Amounts (Detail) - USD ($)	Sep. 30, 2016	Jun. 30, 2016
Debt Disclosure [Abstract]
2018		$ 11,300,000
2020		75,000,000
2021		25,000,000
Thereafter		30,000,000
Total Long-Term Debt - Face Value	$ 141,300,000	$ 141,300,000