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Stock-based Compensation - Summary of PSU Activity (Detail) (Potential Performance Shares (PSU)) - Performance Share Units (PSU) - USD ($)
$ / shares in Units, $ in Thousands
 5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Aug. 13, 2018
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Beginning balance, number of units, outstanding     931,890  
Number of units, granted 336,000 361,000 232,088 619,000
Number of unit, forfeitures     (27,490)  
Ending balance, number of units, outstanding     1,136,488 931,890
Beginning balance, weighted average grant price, outstanding     $ 9.56  
Weighted average grant price, granted $ 12.93 $ 12.52 8.37 $ 7.85
Weighted average grant price, forfeitures     8.91  
Ending balance, weighted average grant price, outstanding     $ 9.33 $ 9.56
Number of PSUs granted 336,000 361,000 232,088 619,000
Grant date fair value $ 4,339 $ 4,517 $ 1,943 $ 4,857
Grant date fair value per unit $ 12.93 $ 12.52 $ 8.37 $ 7.85
Compensation expense recognized for PSUs $ 543 $ 1,651 $ 3,217 $ 1,899
Unrecognized compensation expense related to unvested shares     $ 4,945  
Expected recognition period     1 year 8 months 12 days