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Long-Term Compensation - LTIP Units Awards (Detail) - Long Term Incentive Plan Units [Member] - $ / shares
shares in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vested LTIP Units 4,700 3,900
Number of Unvested Awards, Beginning Balance 3,052  
Granted 1,253  
Forfeited (23)  
Vested LTIP Units (791)  
Number of Unvested Awards, Ending Balance 3,491 3,052
Weighted Average Grant Date Fair Value $ 66.50  
Unvested Weighted Average, Granted 58.63  
Weighted Average Grant Date Fair Value, Forfeited 31.80  
Unvested Weighted Average, Vested LTIP Units 76.98  
Weighted Average Grant Date Fair Value $ 61.53 $ 66.50