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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]    
Income tax expense $ 5.2 $ 13.2
Approximate rate on pre-tax income 130.00% 30.00%
U.S. federal statutory rate 35.00%