Equity - Schedule of Basic and Diluted Earnings Per Share, or EPS, Based on Weighted-Average of Both Restricted and Unrestricted Class A Common Stock Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 83,616	$ 89,860	$ 17,544	$ (53,350)	$ 78,931	$ 74,897	$ 75,174	$ 76,565	$ 137,670	$ 305,567	$ 285,078
Weighted-average shares outstanding, basic and diluted									141,795,977	130,085,398	113,857,238
Per share amount, basic and diluted	$ 0.57	$ 0.61	$ 0.13	$ (0.39)	$ 0.59	$ 0.56	$ 0.59	$ 0.62	$ 0.97	$ 2.35	$ 2.50