Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation - Summary of RSU Grants (Detail)

v3.21.2
Equity-Based Compensation - Summary of RSU Grants (Detail) - Restricted Stock Units - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning Balance, Units 83,150 37,234 37,234
Restricted stock units granted 152,739 57,358  
Vested, Units (43,330) (11,443)  
Ending Balance, Units 192,559 83,149 83,150
Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair Value per unit $ 10.18 $ 13.19 $ 13.19
Fair Value per unit, Granted 13.89 10.18  
Fair Value per unit, Vested 10.18 13.19  
Fair Value per unit 10.18 10.18 10.18
Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair Value per unit 14.54 14.54 14.54
Fair Value per unit, Granted 15.96 11.83  
Fair Value per unit, Vested 14.61 14.54  
Fair Value per unit $ 15.96 $ 14.54 $ 14.54