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Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | [1] | Dec. 31, 2019 | Dec. 31, 2018
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Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Encumbrances exclude the principal balance | $ 635,128 |  |  |  |
Properties with gross assets | 6,534,563 | [1] | $ 1,916,770 | $ 1,796,365 | $ 1,745,640
Mortgage Notes |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Properties with gross assets | 1,238,612 |  |  |  |
Unsecured Credit Facility |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Properties with gross assets | $ 3,737,799 |  |  |  |
[1] | Includes properties classified as held for sale as of December 31, 2021.

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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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