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	12 Months Ended
	May 31, 2013	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Beginning balance		135,263,728	123,664,577	108,081,077
Issuance of class A common stock	25,875,000	10,842,746	10,535,842	14,568,431
Issuance of restricted class A common stock, net		933,623	1,032,082	983,447
Issuance of deferred stock units		46,625	31,227	31,622
Ending balance		147,086,722	135,263,728	123,664,577