Equity-Based Compensation - SARs and Stock Options Fair Value Assumptions (Detail) - shares	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
SARs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted (in shares)	0		25,000
Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options granted (in shares)	0	0
Employees | SARs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted (in shares)	0	0