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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]    
Income tax expense $ 5.6 $ 5.2
Approximate rate on pre-tax income 6.50% 130.00%
U.S. federal statutory rate 35.00%