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Capital Lease - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Capital Leased Assets [Line Items]      
Capital leases future minimum payments present value at inception $ 25,000 $ 25,000  
Property, plant and equipment estimated useful lives, years   15 years  
Depreciation   $ 36,679 $ 30,811
Capital Leased Asset      
Capital Leased Assets [Line Items]      
Depreciation $ 400 $ 800