Equity - Schedule of Movement in Outstanding Shares of Class A Common Stock, Restricted Class A Common Stock and Deferred Stock Units (Detail) - shares		1 Months Ended	9 Months Ended
		May 31, 2013	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Beginning balance			147,086,722	135,263,728
Issuance of class A common stock		25,875,000	10,001,429	10,842,295
Issuance of restricted class A common stock, net	[1]		234,229	351,333
Issuance of deferred stock units			50,009	33,790
Ending balance			157,372,389	146,491,146

[1] The amounts are net of 29,580 and 249 shares of restricted class A common stock forfeited under our stock-based incentive plans during the nine months ended September 30, 2021 and 2020, respectively. See Note 14 for further discussion of our stock-based incentive plans.