Capital Lease - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Capital Leased Assets [Line Items]
Capital leases future minimum payments present value at inception	$ 25,000
Property, plant and equipment estimated useful lives, years	15 years
Depreciation	$ 30,811	$ 23,440
Capital Leased Asset
Capital Leased Assets [Line Items]
Depreciation	$ 800