Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation (Detail)

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Equity-Based Compensation (Detail) - Restricted Stock - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate grant date fair value   $ 3.8
Compensation expense $ 0.4  
Class A Common Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted (in shares)   292,534
Unrecognized compensation expense $ 2.8