Debt - Debt Summary (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.60%	1.90%
Weighted Average Term	11 years 3 months 18 days	10 years 2 months 12 days
Debt	$ 16,985,305	$ 16,849,076
Credit Facilities [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate		0.80%
Weighted Average Term	0 years	2 years
Debt	$ 0	$ 171,794
Senior Notes [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.60%	2.00%
Weighted Average Term	11 years 10 months 24 days	11 years 2 months 12 days
Debt	$ 15,120,544	$ 14,275,870
Term Loans and Unsecured Other [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	0.80%	0.90%
Weighted Average Term	6 years	5 years 7 months 6 days
Debt	$ 1,425,513	$ 1,764,311
Secured Mortgage [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.00%	3.10%
Weighted Average Term	4 years 9 months 18 days	3 years
Debt	$ 439,248	$ 637,101