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Fair Value Measurements - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Number of retail properties impaired | property |  | 1 | 1
Provision for asset impairment | $ 0 | $ 9,002,000 | $ 2,359,000
Discount Rate | Line of Credit |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Weighted average effective market interest rate | 0.0239 | 0.0136 |
Weighted Average Effective Market rate | Mortgages |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Weighted average effective market interest rate | 0.0444 | 0.0425 |
Unconsolidated Entities |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment |  | $ 6,059,000 |
IAGM Retail Fund I, LLC |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Number of retail properties impaired | property |  | 1 |
Provision for asset impairment |  | $ 11,016,000 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Recurring fair value measurements | $ 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Recurring fair value measurements | 0 | 0 |
Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment | 0 | $ 9,002,000 | $ 2,359,000
Fair Value, Measurements, Nonrecurring | IAGM Retail Fund I, LLC | Real Estate | Unconsolidated Entities | Capitalization Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.0850 |
Fair Value, Measurements, Nonrecurring | IAGM Retail Fund I, LLC | Real Estate | Unconsolidated Entities | Discount Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.0950 |
Fair Value, Measurements, Nonrecurring | Level 3 |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Recurring fair value measurements | $ 0 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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