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, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Beginning balance		123,664,577	108,081,077	94,709,290
Issuance of class A common stock	25,875,000	10,535,842	14,568,431	12,421,401
Issuance of restricted class A common stock, net		1,032,082	983,447	922,196
Issuance of deferred stock units		31,227	31,622	28,190
Ending balance		135,263,728	123,664,577	108,081,077