Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Equity-Based Compensation - Summary of RSU Grants (Detail) - Restricted Stock Units - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning Balance, Units 247,316 491,786
Granted, Units 34,388  
Vested, Units (244,470) (244,470)
Ending Balance, Units 37,234 247,316
Fair Value per unit, Granted $ 14.54  
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Fair Value per unit 13.19 $ 13.19
Fair Value per unit, Vested 13.19 13.19
Fair Value per unit 13.19 13.19
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Fair Value per unit 13.23 13.23
Fair Value per unit, Vested 13.23 13.23
Fair Value per unit $ 13.23 $ 13.23