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Prepaid Expenses and Other Assets - Additional Information (Detail) - Partnership Agreement [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]          
Partnership agreement   10 years      
Upfront cash payment   $ 10.0      
Prepaid expenses and other assets $ 1.0   $ 1.0   $ 1.0
Other assets, noncurrent 7.7   7.7   $ 8.3
Amortization expense $ 0.3 $ 0.2 $ 0.6 $ 0.2