Unsecured Line of Credit and Term Notes - Borrowings Outstanding on Unsecured Line of Credit and Term Notes (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Revolving line of credit borrowings	$ 303,000	$ 0
Total term note principal balance outstanding	2,775,000	2,775,000
Less: unamortized debt issuance costs	(14,846)	(16,008)
Less: unamortized senior term note discount	(10,419)	(11,154)
Term notes payable	2,749,735	2,747,838
Term Note Due April 8, 2024 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	175,000	175,000
Senior Term Note Due July 1, 2026 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	600,000	600,000
Senior Term Note Due December 15, 2027 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	450,000	450,000
Term Note Due July 21, 2028 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	200,000	200,000
Senior Term Note Due June 15, 2029 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	350,000	350,000
Senior Term Note Due October 15, 2030 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	400,000	400,000
Senior Term Note Due October 15, 2031 [Member]
Debt Instrument [Line Items]
Total term note principal balance outstanding	$ 600,000	$ 600,000