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	6 Months Ended
	May 31, 2013	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Beginning balance		135,263,728	123,664,577
Issuance of class A common stock	25,875,000	10,841,667	10,535,181
Issuance of restricted class A common stock, net		351,333	317,339
Issuance of deferred stock units		21,077	15,697
Ending balance		146,477,805	134,532,794