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Summary of Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maximum maturity term of financial assets (in days)	90 days
Notes receivable, net	$ 8,642	$ 8,263
Indebtedness, net	3,918,639	3,728,911
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Indebtedness, net	$ 3,900,000	$ 3,700,000
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value percentage of the carrying value of notes receivable	95.00%	95.00%
Total indebtedness fair value variance from carrying value (as a percent)	88.30%	85.30%
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value percentage of the carrying value of notes receivable	105.00%	105.00%
Total indebtedness fair value variance from carrying value (as a percent)	97.50%	94.30%

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Indebtedness fair value percent variance from carrying value

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Maturity period of cash and cash equivalents maximum.

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Estimated Notes Receivable, Fair Value Disclosure As Percent Of Financing Receivable, After Allowance For Credit Loss

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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