Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Interest and rent receivables, Book value	$ 64,622	$ 46,208
Loans, Book value	1,350,394	751,341
Debt, net Book value	(10,581,023)	(8,865,458)
Interest and rent receivables, Fair value	64,967	45,381
Loans, Fair value	1,348,187	756,608
Debt, net Fair value	$ (10,920,597)	$ (9,226,564)