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Equity-Based Compensation - Employee Equity-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense $ 1,211 $ 1,552 $ 2,389 $ 3,042
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense 679 582 1,181 1,004
Performance shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense 184 377 518 910
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense $ 348 $ 593 $ 690 $ 1,128