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Equity-Based Compensation Plan - Summary of Performance Unit Award Activity (Detail) - Performance Shares [Member]
3 Months Ended
Mar. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding at December 31, 2019 2,157,347
Granted 2,147,211
Settled 1,169,354
Forfeited (18,750)
Outstanding at March 31, 2020 3,116,454