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Equity - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to RSUs $ 447 $ 568
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to RSUs 14,975  
Recognized compensation expense related to RSUs (11,590)  
Unrecognized compensation expense for RSUS $ 3,385  
Weighted average remaining period to expense for RSUs 2 years 9 months 18 days