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Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 203,194 |  |
Buildings & Improvements, Initial Cost |  | 978,644 |  |
Land, Total Cost |  | 205,622 |  |
Buildings & Improvements, Total Cost |  | 1,220,779 |  |
Total Cost |  | 1,426,401 |  |
Accumulated Depreciation |  | 654,389 |  |
Total Cost, Net of Accumulated Depreciation |  | 772,012 |  |
Encumbrances |  | 306,762 |  |
The changes in Total Real Estate Assets for the three years ended December 31, are as follows: |  |  |  |
Balance at beginning of year |  | 3,820,352 | $ 4,598,591 | $ 4,713,523
Acquisitions |  | 17,790 | 0 | 37,886
Developments, improvements and expansions |  | 39,397 | 84,972 | 91,921
Adjustments of property carrying values (impairments) |  | (66,600) | 0 | (2,536)
Disposals(A) |  | (2,384,538) | (863,211) | (242,203)
Balance at end of year |  | 1,426,401 | 3,820,352 | 4,598,591
The changes in Accumulated Depreciation and Amortization for the three years ended December 31, are as follows: |  |  |  |
Balance at beginning of year |  | 1,434,209 | 1,539,338 | 1,473,102
Depreciation for year |  | 93,674 | 166,061 | 157,120
Disposals |  | (873,494) | (271,190) | (90,884)
Balance at end of year |  | 654,389 | $ 1,434,209 | $ 1,539,338
Phoenix, AZ [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | 13,069 |  |
Buildings & Improvements, Initial Cost |  | 14,751 |  |
Land, Total Cost |  | 13,069 |  |
Buildings & Improvements, Total Cost |  | 21,675 |  |
Total Cost |  | 34,744 |  |
Accumulated Depreciation |  | 12,022 |  |
Total Cost, Net of Accumulated Depreciation |  | 22,722 |  |
Encumbrances |  | $ 16,015 |  |
Date of Construction (C) Acquisition (A) |  | 1999 |  |
Phoenix, AZ [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 7,856 |  |
Buildings & Improvements, Initial Cost |  | 14,926 |  |
Land, Total Cost |  | 7,613 |  |
Buildings & Improvements, Total Cost |  | 17,007 |  |
Total Cost |  | 24,620 |  |
Accumulated Depreciation |  | 11,934 |  |
Total Cost, Net of Accumulated Depreciation |  | 12,686 |  |
Encumbrances |  | $ 17,421 |  |
Date of Construction (C) Acquisition (A) |  | 2003 |  |
Long Beach, CA [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 0 |  |
Buildings & Improvements, Initial Cost |  | 147,918 |  |
Land, Total Cost |  | 0 |  |
Buildings & Improvements, Total Cost |  | 205,227 |  |
Total Cost |  | 205,227 |  |
Accumulated Depreciation |  | 129,937 |  |
Total Cost, Net of Accumulated Depreciation |  | 75,290 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 2005 |  |
Colorado Springs, CO [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 4,111 |  |
Buildings & Improvements, Initial Cost |  | 22,140 |  |
Land, Total Cost |  | 4,111 |  |
Buildings & Improvements, Total Cost |  | 28,333 |  |
Total Cost |  | 32,444 |  |
Accumulated Depreciation |  | 10,154 |  |
Total Cost, Net of Accumulated Depreciation |  | 22,290 |  |
Encumbrances |  | $ 9,990 |  |
Date of Construction (C) Acquisition (A) |  | 2011 |  |
Parker, CO [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 680 |  |
Buildings & Improvements, Initial Cost |  | 8,398 |  |
Land, Total Cost |  | 680 |  |
Buildings & Improvements, Total Cost |  | 8,824 |  |
Total Cost |  | 9,504 |  |
Accumulated Depreciation |  | 3,198 |  |
Total Cost, Net of Accumulated Depreciation |  | 6,306 |  |
Encumbrances |  | $ 4,377 |  |
Date of Construction (C) Acquisition (A) |  | 2003 |  |
Parker, CO [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 398 |  |
Buildings & Improvements, Initial Cost |  | 21,512 |  |
Land, Total Cost |  | 398 |  |
Buildings & Improvements, Total Cost |  | 26,126 |  |
Total Cost |  | 26,524 |  |
Accumulated Depreciation |  | 9,354 |  |
Total Cost, Net of Accumulated Depreciation |  | 17,170 |  |
Encumbrances |  | $ 9,163 |  |
Date of Construction (C) Acquisition (A) |  | 2003 |  |
Fort Walton Beach, FL [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 3,643 |  |
Buildings & Improvements, Initial Cost |  | 5,612 |  |
Land, Total Cost |  | 3,462 |  |
Buildings & Improvements, Total Cost |  | 5,578 |  |
Total Cost |  | 9,040 |  |
Accumulated Depreciation |  | 1,101 |  |
Total Cost, Net of Accumulated Depreciation |  | 7,939 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 2021 |  |
Winter Garden, FL [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 18,605 |  |
Buildings & Improvements, Initial Cost |  | 105,037 |  |
Land, Total Cost |  | 19,124 |  |
Buildings & Improvements, Total Cost |  | 114,249 |  |
Total Cost |  | 133,373 |  |
Accumulated Depreciation |  | 45,985 |  |
Total Cost, Net of Accumulated Depreciation |  | 87,388 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 2013 |  |
Atlanta, GA [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 14,078 |  |
Buildings & Improvements, Initial Cost |  | 41,050 |  |
Land, Total Cost |  | 14,078 |  |
Buildings & Improvements, Total Cost |  | 48,841 |  |
Total Cost |  | 62,919 |  |
Accumulated Depreciation |  | 24,293 |  |
Total Cost, Net of Accumulated Depreciation |  | 38,626 |  |
Encumbrances |  | $ 23,447 |  |
Date of Construction (C) Acquisition (A) |  | 2009 |  |
Roswell, GA [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 6,566 |  |
Buildings & Improvements, Initial Cost |  | 15,005 |  |
Land, Total Cost |  | 7,894 |  |
Buildings & Improvements, Total Cost |  | 29,925 |  |
Total Cost |  | 37,819 |  |
Accumulated Depreciation |  | 16,628 |  |
Total Cost, Net of Accumulated Depreciation |  | 21,191 |  |
Encumbrances |  | $ 10,486 |  |
Date of Construction (C) Acquisition (A) |  | 2007 |  |
Chicago, IL [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 22,642 |  |
Buildings & Improvements, Initial Cost |  | 82,754 |  |
Land, Total Cost |  | 22,642 |  |
Buildings & Improvements, Total Cost |  | 85,122 |  |
Total Cost |  | 107,764 |  |
Accumulated Depreciation |  | 30,363 |  |
Total Cost, Net of Accumulated Depreciation |  | 77,401 |  |
Encumbrances |  | $ 29,145 |  |
Date of Construction (C) Acquisition (A) |  | 2014 |  |
Chicago, IL [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 23,588 |  |
Buildings & Improvements, Initial Cost |  | 45,632 |  |
Land, Total Cost |  | 23,588 |  |
Buildings & Improvements, Total Cost |  | 46,066 |  |
Total Cost |  | 69,654 |  |
Accumulated Depreciation |  | 13,830 |  |
Total Cost, Net of Accumulated Depreciation |  | 55,824 |  |
Encumbrances |  | $ 30,383 |  |
Date of Construction (C) Acquisition (A) |  | 2017 |  |
Brentwood, MO [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 10,018 |  |
Buildings & Improvements, Initial Cost |  | 32,053 |  |
Land, Total Cost |  | 10,018 |  |
Buildings & Improvements, Total Cost |  | 41,336 |  |
Total Cost |  | 51,354 |  |
Accumulated Depreciation |  | 31,258 |  |
Total Cost, Net of Accumulated Depreciation |  | 20,096 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 1998 |  |
East Hanover, NJ [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 3,847 |  |
Buildings & Improvements, Initial Cost |  | 23,798 |  |
Land, Total Cost |  | 3,847 |  |
Buildings & Improvements, Total Cost |  | 30,081 |  |
Total Cost |  | 33,928 |  |
Accumulated Depreciation |  | 17,842 |  |
Total Cost, Net of Accumulated Depreciation |  | 16,086 |  |
Encumbrances |  | $ 9,908 |  |
Date of Construction (C) Acquisition (A) |  | 2007 |  |
Edgewater, NJ [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 7,714 |  |
Buildings & Improvements, Initial Cost |  | 30,473 |  |
Land, Total Cost |  | 7,714 |  |
Buildings & Improvements, Total Cost |  | 49,814 |  |
Total Cost |  | 57,528 |  |
Accumulated Depreciation |  | 21,915 |  |
Total Cost, Net of Accumulated Depreciation |  | 35,613 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 2007 |  |
Princeton, NJ [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 17,991 |  |
Buildings & Improvements, Initial Cost |  | 82,063 |  |
Land, Total Cost |  | 18,998 |  |
Buildings & Improvements, Total Cost |  | 131,619 |  |
Total Cost |  | 150,617 |  |
Accumulated Depreciation |  | 85,409 |  |
Total Cost, Net of Accumulated Depreciation |  | 65,208 |  |
Encumbrances |  | $ 99,862 |  |
Date of Construction (C) Acquisition (A) |  | 1997 |  |
Chapel Hill, NC [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 5,641 |  |
Buildings & Improvements, Initial Cost |  | 3,727 |  |
Land, Total Cost |  | 5,641 |  |
Buildings & Improvements, Total Cost |  | 3,727 |  |
Total Cost |  | 9,368 |  |
Accumulated Depreciation |  | 111 |  |
Total Cost, Net of Accumulated Depreciation |  | 9,257 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 2024 |  |
Chapel Hill, NC [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 4,500 |  |
Buildings & Improvements, Initial Cost |  | 2,892 |  |
Land, Total Cost |  | 4,500 |  |
Buildings & Improvements, Total Cost |  | 2,969 |  |
Total Cost |  | 7,469 |  |
Accumulated Depreciation |  | 98 |  |
Total Cost, Net of Accumulated Depreciation |  | 7,371 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 2024 |  |
Stow, OH [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 993 |  |
Buildings & Improvements, Initial Cost |  | 9,028 |  |
Land, Total Cost |  | 993 |  |
Buildings & Improvements, Total Cost |  | 48,669 |  |
Total Cost |  | 49,662 |  |
Accumulated Depreciation |  | 31,779 |  |
Total Cost, Net of Accumulated Depreciation |  | 17,883 |  |
Encumbrances |  | $ 0 |  |
Date of Construction (C) Acquisition (A) |  | 1969 |  |
Portland, OR [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 10,122 |  |
Buildings & Improvements, Initial Cost |  | 37,457 |  |
Land, Total Cost |  | 10,122 |  |
Buildings & Improvements, Total Cost |  | 38,639 |  |
Total Cost |  | 48,761 |  |
Accumulated Depreciation |  | 6,989 |  |
Total Cost, Net of Accumulated Depreciation |  | 41,772 |  |
Encumbrances |  | $ 14,614 |  |
Date of Construction (C) Acquisition (A) |  | 2019 |  |
Easton, PA [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 7,691 |  |
Buildings & Improvements, Initial Cost |  | 20,405 |  |
Land, Total Cost |  | 7,691 |  |
Buildings & Improvements, Total Cost |  | 21,792 |  |
Total Cost |  | 29,483 |  |
Accumulated Depreciation |  | 4,372 |  |
Total Cost, Net of Accumulated Depreciation |  | 25,111 |  |
Encumbrances |  | $ 17,502 |  |
Date of Construction (C) Acquisition (A) |  | 2020 |  |
Richmond, VA [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost |  | $ 11,879 |  |
Buildings & Improvements, Initial Cost |  | 34,736 |  |
Land, Total Cost |  | 11,879 |  |
Buildings & Improvements, Total Cost |  | 37,883 |  |
Total Cost |  | 49,762 |  |
Accumulated Depreciation |  | 21,588 |  |
Total Cost, Net of Accumulated Depreciation |  | 28,174 |  |
Encumbrances |  | $ 14,449 |  |
Date of Construction (C) Acquisition (A) |  | 2007 |  |
Portfolio Balance [Member] |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |
Land, Initial Cost | [1] | $ 7,562 |  |
Buildings & Improvements, Initial Cost | [1] | 177,277 |  |
Land, Total Cost | [1] | 7,560 |  |
Buildings & Improvements, Total Cost | [1] | 177,277 |  |
Total Cost | [1] | 184,837 |  |
Accumulated Depreciation | [1] | 124,229 |  |
Total Cost, Net of Accumulated Depreciation | [1] | 60,608 |  |
Encumbrances | [1] | $ 0 |  |
[1] | Includes the Company’s Beachwood headquarters and related fixtures and equipment as well as $0.9 million of undeveloped land and $1.8 million of construction in progress at December 31, 2024.

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