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Share-Based Payment Awards - Time-Vested Restricted Stock Units - Additional Information (Detail) - 2016 Long Term Incentive Plan [Member] - RSU [Member] - shares
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Jun. 30, 2018
Class of Stock [Line Items]      
Ratable annual vesting period of equity awards     3 years
Weighted average remaining vesting term   1 year 3 months 14 days  
Stock units granted 305,616