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Equity-Based Compensation and Equity - Schedule of Assumptions Used (Detail) - Common Series D Units [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Grant date fair value $ 300.00 $ 300.00 $ 300.00
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 48.00% 44.00% 40.00%
Risk-free interest rate 0.10% 1.60% 2.60%
Lack of marketability discount 23.00% 26.00% 25.00%
Expected term (years) 1 year 1 year 1 year