Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Equity-Based Compensation - Summary of RSU Grants (Detail) - Restricted Stock Units - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning Balance, Units 247,316 491,786 491,786
Ending Balance, Units 247,316 247,316 491,786
Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair Value per unit $ 13.19 $ 13.19 $ 13.19
Fair Value per unit 13.19 13.19 13.19
Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair Value per unit 13.23 13.23 13.23
Fair Value per unit $ 13.23 $ 13.23 $ 13.23