Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,038,032
Buildings & Improvements, Initial Cost	3,360,464
Land, Total Cost	1,075,106
Buildings & Improvements, Total Cost	4,358,053
Total Cost	5,433,159		$ 4,989,388
Accumulated Depreciation	1,652,899
Total Cost, Net of Accumulated Depreciation	3,780,260
Encumbrances	54,173
The changes in Total Real Estate Assets for the three years ended December 31, are as follows:
Balance at beginning of year	5,238,881	$ 4,989,388	4,709,812
Acquisitions	328,898	215,998	242,593
Developments, improvements and expansions	113,876	84,130	59,126
Adjustments of property carrying values (Impairments)	(2,536)	(7,270)	(5,200)
Disposals(A)	(245,960)	(43,365)	(16,943)
Balance at end of year	5,433,159	5,238,881	4,989,388
The changes in Accumulated Depreciation and Amortization for the three years ended December 31, are as follows:
Balance at beginning of year	1,571,569	1,427,057	1,289,148
Depreciation for year	176,047	164,200	154,906
Disposals	(94,717)	(19,688)	(16,997)
Balance at end of year	1,652,899	$ 1,571,569	$ 1,427,057
Chandler, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	1,417
Buildings & Improvements, Initial Cost	3,490
Land, Total Cost	1,417
Buildings & Improvements, Total Cost	3,490
Total Cost	4,907
Accumulated Depreciation	55
Total Cost, Net of Accumulated Depreciation	4,852
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Mesa, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,486
Buildings & Improvements, Initial Cost	3,202
Land, Total Cost	1,486
Buildings & Improvements, Total Cost	3,202
Total Cost	4,688
Accumulated Depreciation	47
Total Cost, Net of Accumulated Depreciation	4,641
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Phoenix, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 18,701
Buildings & Improvements, Initial Cost	18,929
Land, Total Cost	18,701
Buildings & Improvements, Total Cost	26,481
Total Cost	45,182
Accumulated Depreciation	13,150
Total Cost, Net of Accumulated Depreciation	32,032
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1999
Phoenix, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,352
Buildings & Improvements, Initial Cost	24,414
Land, Total Cost	15,352
Buildings & Improvements, Total Cost	29,850
Total Cost	45,202
Accumulated Depreciation	19,403
Total Cost, Net of Accumulated Depreciation	25,799
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Phoenix, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,090
Buildings & Improvements, Initial Cost	36,880
Land, Total Cost	18,399
Buildings & Improvements, Total Cost	45,890
Total Cost	64,289
Accumulated Depreciation	16,779
Total Cost, Net of Accumulated Depreciation	47,510
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Scottsdale, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,424
Buildings & Improvements, Initial Cost	7,684
Land, Total Cost	6,424
Buildings & Improvements, Total Cost	7,684
Total Cost	14,108
Accumulated Depreciation	261
Total Cost, Net of Accumulated Depreciation	13,847
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Scottsdale, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,756
Buildings & Improvements, Initial Cost	4,404
Land, Total Cost	1,756
Buildings & Improvements, Total Cost	4,404
Total Cost	6,160
Accumulated Depreciation	71
Total Cost, Net of Accumulated Depreciation	6,089
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Tempe, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,451
Buildings & Improvements, Initial Cost	4,640
Land, Total Cost	2,451
Buildings & Improvements, Total Cost	4,640
Total Cost	7,091
Accumulated Depreciation	77
Total Cost, Net of Accumulated Depreciation	7,014
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Buena Park, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,269
Buildings & Improvements, Initial Cost	21,427
Land, Total Cost	27,269
Buildings & Improvements, Total Cost	27,517
Total Cost	54,786
Accumulated Depreciation	7,508
Total Cost, Net of Accumulated Depreciation	47,278
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
Fontana, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,861
Buildings & Improvements, Initial Cost	57,931
Land, Total Cost	23,861
Buildings & Improvements, Total Cost	64,546
Total Cost	88,407
Accumulated Depreciation	18,615
Total Cost, Net of Accumulated Depreciation	69,792
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Lafayette, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 21,431
Buildings & Improvements, Initial Cost	36,076
Land, Total Cost	21,431
Buildings & Improvements, Total Cost	36,076
Total Cost	57,507
Accumulated Depreciation	867
Total Cost, Net of Accumulated Depreciation	56,640
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Lafayette, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,808
Buildings & Improvements, Initial Cost	32,751
Land, Total Cost	6,808
Buildings & Improvements, Total Cost	32,765
Total Cost	39,573
Accumulated Depreciation	776
Total Cost, Net of Accumulated Depreciation	38,797
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
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	200,298
Total Cost	200,298
Accumulated Depreciation	113,340
Total Cost, Net of Accumulated Depreciation	86,958
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
Oakland, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,361
Buildings & Improvements, Initial Cost	33,538
Land, Total Cost	4,361
Buildings & Improvements, Total Cost	33,538
Total Cost	37,899
Accumulated Depreciation	10,700
Total Cost, Net of Accumulated Depreciation	27,199
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Roseville, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,574
Buildings & Improvements, Initial Cost	67,031
Land, Total Cost	23,574
Buildings & Improvements, Total Cost	69,486
Total Cost	93,060
Accumulated Depreciation	19,539
Total Cost, Net of Accumulated Depreciation	73,521
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
San Francisco, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,464
Buildings & Improvements, Initial Cost	25,730
Land, Total Cost	10,464
Buildings & Improvements, Total Cost	30,578
Total Cost	41,042
Accumulated Depreciation	15,131
Total Cost, Net of Accumulated Depreciation	25,911
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2002
Centennial, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 7,833
Buildings & Improvements, Initial Cost	35,550
Land, Total Cost	9,075
Buildings & Improvements, Total Cost	70,611
Total Cost	79,686
Accumulated Depreciation	49,002
Total Cost, Net of Accumulated Depreciation	30,684
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1997
Colorado Springs, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 9,001
Buildings & Improvements, Initial Cost	47,671
Land, Total Cost	9,001
Buildings & Improvements, Total Cost	61,146
Total Cost	70,147
Accumulated Depreciation	21,421
Total Cost, Net of Accumulated Depreciation	48,726
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2011
Denver, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 20,733
Buildings & Improvements, Initial Cost	22,818
Land, Total Cost	20,804
Buildings & Improvements, Total Cost	28,644
Total Cost	49,448
Accumulated Depreciation	17,771
Total Cost, Net of Accumulated Depreciation	31,677
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Denver, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,222
Buildings & Improvements, Initial Cost	4,305
Land, Total Cost	1,222
Buildings & Improvements, Total Cost	4,305
Total Cost	5,527
Accumulated Depreciation	25
Total Cost, Net of Accumulated Depreciation	5,502
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Parker, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,632
Buildings & Improvements, Initial Cost	38,256
Land, Total Cost	4,632
Buildings & Improvements, Total Cost	43,107
Total Cost	47,739
Accumulated Depreciation	12,529
Total Cost, Net of Accumulated Depreciation	35,210
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Guilford, CT [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,588
Buildings & Improvements, Initial Cost	41,892
Land, Total Cost	6,457
Buildings & Improvements, Total Cost	64,740
Total Cost	71,197
Accumulated Depreciation	14,307
Total Cost, Net of Accumulated Depreciation	56,890
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
Windsor Court, CT [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,090
Buildings & Improvements, Initial Cost	11,745
Land, Total Cost	6,090
Buildings & Improvements, Total Cost	12,538
Total Cost	18,628
Accumulated Depreciation	6,466
Total Cost, Net of Accumulated Depreciation	12,162
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Boca Raton, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,120
Buildings & Improvements, Initial Cost	58,982
Land, Total Cost	23,120
Buildings & Improvements, Total Cost	59,631
Total Cost	82,751
Accumulated Depreciation	1,464
Total Cost, Net of Accumulated Depreciation	81,287
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Boynton Beach, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,048
Buildings & Improvements, Initial Cost	9,256
Land, Total Cost	6,048
Buildings & Improvements, Total Cost	9,569
Total Cost	15,617
Accumulated Depreciation	559
Total Cost, Net of Accumulated Depreciation	15,058
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Brandon, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 0
Buildings & Improvements, Initial Cost	4,111
Land, Total Cost	0
Buildings & Improvements, Total Cost	27,781
Total Cost	27,781
Accumulated Depreciation	5,026
Total Cost, Net of Accumulated Depreciation	22,755
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1972
Brandon, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,775
Buildings & Improvements, Initial Cost	13,117
Land, Total Cost	4,775
Buildings & Improvements, Total Cost	19,929
Total Cost	24,704
Accumulated Depreciation	9,520
Total Cost, Net of Accumulated Depreciation	15,184
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2009
Brandon, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,938
Buildings & Improvements, Initial Cost	13,685
Land, Total Cost	2,938
Buildings & Improvements, Total Cost	19,058
Total Cost	21,996
Accumulated Depreciation	5,082
Total Cost, Net of Accumulated Depreciation	16,914
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Casselberry, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,336
Buildings & Improvements, Initial Cost	30,349
Land, Total Cost	10,336
Buildings & Improvements, Total Cost	30,418
Total Cost	40,754
Accumulated Depreciation	1,331
Total Cost, Net of Accumulated Depreciation	39,423
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Delray Beach, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,664
Buildings & Improvements, Initial Cost	26,006
Land, Total Cost	12,664
Buildings & Improvements, Total Cost	26,093
Total Cost	38,757
Accumulated Depreciation	1,496
Total Cost, Net of Accumulated Depreciation	37,261
Encumbrances	$ 17,075
Date of Construction (C) Acquisition (A)	2021
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	6,011
Total Cost	9,473
Accumulated Depreciation	307
Total Cost, Net of Accumulated Depreciation	9,166
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Jupiter, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,764
Buildings & Improvements, Initial Cost	20,051
Land, Total Cost	8,764
Buildings & Improvements, Total Cost	20,964
Total Cost	29,728
Accumulated Depreciation	1,660
Total Cost, Net of Accumulated Depreciation	28,068
Encumbrances	$ 12,409
Date of Construction (C) Acquisition (A)	2020
Melbourne, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,111
Buildings & Improvements, Initial Cost	7,325
Land, Total Cost	3,111
Buildings & Improvements, Total Cost	14,553
Total Cost	17,664
Accumulated Depreciation	1,859
Total Cost, Net of Accumulated Depreciation	15,805
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2018
Miami, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 11,626
Buildings & Improvements, Initial Cost	30,457
Land, Total Cost	26,743
Buildings & Improvements, Total Cost	122,412
Total Cost	149,155
Accumulated Depreciation	59,486
Total Cost, Net of Accumulated Depreciation	89,669
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2006
Naples, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,172
Buildings & Improvements, Initial Cost	39,342
Land, Total Cost	10,172
Buildings & Improvements, Total Cost	43,751
Total Cost	53,923
Accumulated Depreciation	13,142
Total Cost, Net of Accumulated Depreciation	40,781
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Orlando, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,528
Buildings & Improvements, Initial Cost	56,684
Land, Total Cost	13,057
Buildings & Improvements, Total Cost	82,415
Total Cost	95,472
Accumulated Depreciation	16,936
Total Cost, Net of Accumulated Depreciation	78,536
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2016
Orlando, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 9,451
Buildings & Improvements, Initial Cost	16,424
Land, Total Cost	9,451
Buildings & Improvements, Total Cost	16,642
Total Cost	26,093
Accumulated Depreciation	1,274
Total Cost, Net of Accumulated Depreciation	24,819
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2020
Palm Harbor, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,137
Buildings & Improvements, Initial Cost	4,089
Land, Total Cost	1,137
Buildings & Improvements, Total Cost	5,523
Total Cost	6,660
Accumulated Depreciation	4,332
Total Cost, Net of Accumulated Depreciation	2,328
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1995
Plantation, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 21,729
Buildings & Improvements, Initial Cost	37,331
Land, Total Cost	22,112
Buildings & Improvements, Total Cost	96,697
Total Cost	118,809
Accumulated Depreciation	53,172
Total Cost, Net of Accumulated Depreciation	65,637
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Tamarac, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 16,730
Buildings & Improvements, Initial Cost	22,139
Land, Total Cost	16,730
Buildings & Improvements, Total Cost	22,631
Total Cost	39,361
Accumulated Depreciation	1,250
Total Cost, Net of Accumulated Depreciation	38,111
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Tampa, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,000
Buildings & Improvements, Initial Cost	10,907
Land, Total Cost	10,000
Buildings & Improvements, Total Cost	11,204
Total Cost	21,204
Accumulated Depreciation	1,236
Total Cost, Net of Accumulated Depreciation	19,968
Encumbrances	$ 9,100
Date of Construction (C) Acquisition (A)	2019
Tampa, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,800
Buildings & Improvements, Initial Cost	15,874
Land, Total Cost	6,800
Buildings & Improvements, Total Cost	16,018
Total Cost	22,818
Accumulated Depreciation	750
Total Cost, Net of Accumulated Depreciation	22,068
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Wesley Chapel, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,080
Buildings & Improvements, Initial Cost	21,567
Land, Total Cost	8,080
Buildings & Improvements, Total Cost	22,129
Total Cost	30,209
Accumulated Depreciation	775
Total Cost, Net of Accumulated Depreciation	29,434
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Winter Garden, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 38,945
Buildings & Improvements, Initial Cost	130,382
Land, Total Cost	38,945
Buildings & Improvements, Total Cost	141,315
Total Cost	180,260
Accumulated Depreciation	45,685
Total Cost, Net of Accumulated Depreciation	134,575
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Alpharetta, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,370
Buildings & Improvements, Initial Cost	3,003
Land, Total Cost	1,370
Buildings & Improvements, Total Cost	3,003
Total Cost	4,373
Accumulated Depreciation	88
Total Cost, Net of Accumulated Depreciation	4,285
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
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	48,229
Total Cost	62,307
Accumulated Depreciation	20,646
Total Cost, Net of Accumulated Depreciation	41,661
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2009
Atlanta, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,358
Buildings & Improvements, Initial Cost	17,103
Land, Total Cost	12,365
Buildings & Improvements, Total Cost	17,324
Total Cost	29,689
Accumulated Depreciation	917
Total Cost, Net of Accumulated Depreciation	28,772
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Atlanta, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,719
Buildings & Improvements, Initial Cost	5,379
Land, Total Cost	2,719
Buildings & Improvements, Total Cost	5,379
Total Cost	8,098
Accumulated Depreciation	101
Total Cost, Net of Accumulated Depreciation	7,997
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Cumming, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 14,249
Buildings & Improvements, Initial Cost	23,653
Land, Total Cost	14,249
Buildings & Improvements, Total Cost	30,112
Total Cost	44,361
Accumulated Depreciation	17,726
Total Cost, Net of Accumulated Depreciation	26,635
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Cumming, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,851
Buildings & Improvements, Initial Cost	49,659
Land, Total Cost	6,851
Buildings & Improvements, Total Cost	53,301
Total Cost	60,152
Accumulated Depreciation	16,733
Total Cost, Net of Accumulated Depreciation	43,419
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Cumming, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,391
Buildings & Improvements, Initial Cost	8,218
Land, Total Cost	3,391
Buildings & Improvements, Total Cost	9,060
Total Cost	12,451
Accumulated Depreciation	1,475
Total Cost, Net of Accumulated Depreciation	10,976
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2018
Douglasville, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,839
Buildings & Improvements, Initial Cost	5,511
Land, Total Cost	2,839
Buildings & Improvements, Total Cost	7,441
Total Cost	10,280
Accumulated Depreciation	1,564
Total Cost, Net of Accumulated Depreciation	8,716
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2018
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	29,378
Total Cost	37,272
Accumulated Depreciation	14,468
Total Cost, Net of Accumulated Depreciation	22,804
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Snellville, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,185
Buildings & Improvements, Initial Cost	51,815
Land, Total Cost	7,859
Buildings & Improvements, Total Cost	54,214
Total Cost	62,073
Accumulated Depreciation	31,324
Total Cost, Net of Accumulated Depreciation	30,749
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Suwanee, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 13,479
Buildings & Improvements, Initial Cost	23,923
Land, Total Cost	13,335
Buildings & Improvements, Total Cost	35,763
Total Cost	49,098
Accumulated Depreciation	21,105
Total Cost, Net of Accumulated Depreciation	27,993
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
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	83,617
Total Cost	106,259
Accumulated Depreciation	24,383
Total Cost, Net of Accumulated Depreciation	81,876
Encumbrances	$ 0
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	45,957
Total Cost	69,545
Accumulated Depreciation	10,342
Total Cost, Net of Accumulated Depreciation	59,203
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2017
Schaumburg, IL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,466
Buildings & Improvements, Initial Cost	84,679
Land, Total Cost	21,736
Buildings & Improvements, Total Cost	81,928
Total Cost	103,664
Accumulated Depreciation	25,226
Total Cost, Net of Accumulated Depreciation	78,438
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Everett, MA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 9,311
Buildings & Improvements, Initial Cost	44,647
Land, Total Cost	9,462
Buildings & Improvements, Total Cost	62,648
Total Cost	72,110
Accumulated Depreciation	39,659
Total Cost, Net of Accumulated Depreciation	32,451
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2001
Framingham, MA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 75,675
Buildings & Improvements, Initial Cost	191,594
Land, Total Cost	75,675
Buildings & Improvements, Total Cost	210,436
Total Cost	286,111
Accumulated Depreciation	64,146
Total Cost, Net of Accumulated Depreciation	221,965
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	41,135
Total Cost	51,153
Accumulated Depreciation	27,887
Total Cost, Net of Accumulated Depreciation	23,266
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	29,739
Total Cost	33,586
Accumulated Depreciation	15,233
Total Cost, Net of Accumulated Depreciation	18,353
Encumbrances	$ 0
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	44,248
Total Cost	51,962
Accumulated Depreciation	17,400
Total Cost, Net of Accumulated Depreciation	34,562
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Freehold, NJ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,460
Buildings & Improvements, Initial Cost	2,475
Land, Total Cost	3,166
Buildings & Improvements, Total Cost	3,816
Total Cost	6,982
Accumulated Depreciation	1,686
Total Cost, Net of Accumulated Depreciation	5,296
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
Hamilton, NJ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,039
Buildings & Improvements, Initial Cost	49,896
Land, Total Cost	10,014
Buildings & Improvements, Total Cost	97,909
Total Cost	107,923
Accumulated Depreciation	53,304
Total Cost, Net of Accumulated Depreciation	54,619
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
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	123,996
Total Cost	142,994
Accumulated Depreciation	77,087
Total Cost, Net of Accumulated Depreciation	65,907
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1997
Voorhees, NJ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,350
Buildings & Improvements, Initial Cost	1,837
Land, Total Cost	1,350
Buildings & Improvements, Total Cost	5,201
Total Cost	6,551
Accumulated Depreciation	429
Total Cost, Net of Accumulated Depreciation	6,122
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2020
Hempstead, NY [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 26,487
Buildings & Improvements, Initial Cost	14,418
Land, Total Cost	26,479
Buildings & Improvements, Total Cost	14,843
Total Cost	41,322
Accumulated Depreciation	1,343
Total Cost, Net of Accumulated Depreciation	39,979
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2020
Charlotte, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,707
Buildings & Improvements, Initial Cost	45,021
Land, Total Cost	27,707
Buildings & Improvements, Total Cost	52,858
Total Cost	80,565
Accumulated Depreciation	20,777
Total Cost, Net of Accumulated Depreciation	59,788
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2011
Charlotte, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 11,224
Buildings & Improvements, Initial Cost	82,124
Land, Total Cost	11,173
Buildings & Improvements, Total Cost	100,145
Total Cost	111,318
Accumulated Depreciation	34,347
Total Cost, Net of Accumulated Depreciation	76,971
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Charlotte, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,600
Buildings & Improvements, Initial Cost	30,392
Land, Total Cost	8,749
Buildings & Improvements, Total Cost	54,623
Total Cost	63,372
Accumulated Depreciation	14,700
Total Cost, Net of Accumulated Depreciation	48,672
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Cornelius, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,382
Buildings & Improvements, Initial Cost	15,184
Land, Total Cost	4,190
Buildings & Improvements, Total Cost	21,616
Total Cost	25,806
Accumulated Depreciation	11,714
Total Cost, Net of Accumulated Depreciation	14,092
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Cincinnati, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 19,572
Buildings & Improvements, Initial Cost	54,495
Land, Total Cost	19,572
Buildings & Improvements, Total Cost	80,018
Total Cost	99,590
Accumulated Depreciation	22,745
Total Cost, Net of Accumulated Depreciation	76,845
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Columbus, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,922
Buildings & Improvements, Initial Cost	46,006
Land, Total Cost	14,078
Buildings & Improvements, Total Cost	73,827
Total Cost	87,905
Accumulated Depreciation	52,888
Total Cost, Net of Accumulated Depreciation	35,017
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1998
Columbus, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 18,716
Buildings & Improvements, Initial Cost	64,617
Land, Total Cost	20,666
Buildings & Improvements, Total Cost	73,440
Total Cost	94,106
Accumulated Depreciation	26,468
Total Cost, Net of Accumulated Depreciation	67,638
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2011
Mason, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,032
Buildings & Improvements, Initial Cost	23,788
Land, Total Cost	2,032
Buildings & Improvements, Total Cost	31,012
Total Cost	33,044
Accumulated Depreciation	8,484
Total Cost, Net of Accumulated Depreciation	24,560
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
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	47,786
Total Cost	48,779
Accumulated Depreciation	27,874
Total Cost, Net of Accumulated Depreciation	20,905
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1969
Westlake, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 424
Buildings & Improvements, Initial Cost	4,004
Land, Total Cost	424
Buildings & Improvements, Total Cost	36,952
Total Cost	37,376
Accumulated Depreciation	7,835
Total Cost, Net of Accumulated Depreciation	29,541
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1974
Portland, OR [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 20,208
Buildings & Improvements, Initial Cost	50,738
Land, Total Cost	20,208
Buildings & Improvements, Total Cost	65,853
Total Cost	86,061
Accumulated Depreciation	26,682
Total Cost, Net of Accumulated Depreciation	59,379
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
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	38,350
Total Cost	48,472
Accumulated Depreciation	4,310
Total Cost, Net of Accumulated Depreciation	44,162
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2019
Boothwyn, PA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,370
Buildings & Improvements, Initial Cost	16,931
Land, Total Cost	6,258
Buildings & Improvements, Total Cost	17,297
Total Cost	23,555
Accumulated Depreciation	1,731
Total Cost, Net of Accumulated Depreciation	21,824
Encumbrances	$ 15,589
Date of Construction (C) Acquisition (A)	2020
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	21,228
Total Cost	28,919
Accumulated Depreciation	2,231
Total Cost, Net of Accumulated Depreciation	26,688
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2020
Anderson, SC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,372
Buildings & Improvements, Initial Cost	11,656
Land, Total Cost	1,372
Buildings & Improvements, Total Cost	11,757
Total Cost	13,129
Accumulated Depreciation	887
Total Cost, Net of Accumulated Depreciation	12,242
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2020
Mount Pleasant, SC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,430
Buildings & Improvements, Initial Cost	10,470
Land, Total Cost	2,341
Buildings & Improvements, Total Cost	31,454
Total Cost	33,795
Accumulated Depreciation	18,388
Total Cost, Net of Accumulated Depreciation	15,407
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1995
Brentwood, TN [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,101
Buildings & Improvements, Initial Cost	25,956
Land, Total Cost	6,101
Buildings & Improvements, Total Cost	28,038
Total Cost	34,139
Accumulated Depreciation	8,919
Total Cost, Net of Accumulated Depreciation	25,220
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Highland Village, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 5,545
Buildings & Improvements, Initial Cost	28,365
Land, Total Cost	5,545
Buildings & Improvements, Total Cost	30,902
Total Cost	36,447
Accumulated Depreciation	11,139
Total Cost, Net of Accumulated Depreciation	25,308
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Houston, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,743
Buildings & Improvements, Initial Cost	18,506
Land, Total Cost	2,743
Buildings & Improvements, Total Cost	18,506
Total Cost	21,249
Accumulated Depreciation	382
Total Cost, Net of Accumulated Depreciation	20,867
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Round Rock, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,467
Buildings & Improvements, Initial Cost	8,839
Land, Total Cost	3,467
Buildings & Improvements, Total Cost	8,921
Total Cost	12,388
Accumulated Depreciation	1,054
Total Cost, Net of Accumulated Depreciation	11,334
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2019
San Antonio, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,475
Buildings & Improvements, Initial Cost	37,327
Land, Total Cost	4,873
Buildings & Improvements, Total Cost	55,226
Total Cost	60,099
Accumulated Depreciation	33,002
Total Cost, Net of Accumulated Depreciation	27,097
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2002
San Antonio, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 5,602
Buildings & Improvements, Initial Cost	39,196
Land, Total Cost	10,158
Buildings & Improvements, Total Cost	119,803
Total Cost	129,961
Accumulated Depreciation	54,298
Total Cost, Net of Accumulated Depreciation	75,663
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
San Antonio, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,381
Buildings & Improvements, Initial Cost	6,487
Land, Total Cost	2,381
Buildings & Improvements, Total Cost	24,630
Total Cost	27,011
Accumulated Depreciation	13,541
Total Cost, Net of Accumulated Depreciation	13,470
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Charlottesville, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,181
Buildings & Improvements, Initial Cost	6,571
Land, Total Cost	2,181
Buildings & Improvements, Total Cost	6,571
Total Cost	8,752
Accumulated Depreciation	363
Total Cost, Net of Accumulated Depreciation	8,389
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Charlottesville, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,400
Buildings & Improvements, Initial Cost	2,537
Land, Total Cost	1,404
Buildings & Improvements, Total Cost	2,537
Total Cost	3,941
Accumulated Depreciation	87
Total Cost, Net of Accumulated Depreciation	3,854
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2021
Fairfax, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,681
Buildings & Improvements, Initial Cost	68,536
Land, Total Cost	15,681
Buildings & Improvements, Total Cost	71,807
Total Cost	87,488
Accumulated Depreciation	21,781
Total Cost, Net of Accumulated Depreciation	65,707
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Fairfax, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,377
Buildings & Improvements, Initial Cost	10,868
Land, Total Cost	4,377
Buildings & Improvements, Total Cost	10,910
Total Cost	15,287
Accumulated Depreciation	212
Total Cost, Net of Accumulated Depreciation	15,075
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Fairfax, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,830
Buildings & Improvements, Initial Cost	6,206
Land, Total Cost	1,830
Buildings & Improvements, Total Cost	6,206
Total Cost	8,036
Accumulated Depreciation	126
Total Cost, Net of Accumulated Depreciation	7,910
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Fairfax, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,532
Buildings & Improvements, Initial Cost	5,221
Land, Total Cost	4,532
Buildings & Improvements, Total Cost	5,360
Total Cost	9,892
Accumulated Depreciation	114
Total Cost, Net of Accumulated Depreciation	9,778
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2022
Richmond, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 7,331
Buildings & Improvements, Initial Cost	49,278
Land, Total Cost	7,330
Buildings & Improvements, Total Cost	51,864
Total Cost	59,194
Accumulated Depreciation	3,844
Total Cost, Net of Accumulated Depreciation	55,350
Encumbrances	$ 0
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	37,732
Total Cost	49,611
Accumulated Depreciation	18,883
Total Cost, Net of Accumulated Depreciation	30,728
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Springfield, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 17,016
Buildings & Improvements, Initial Cost	40,038
Land, Total Cost	17,016
Buildings & Improvements, Total Cost	45,000
Total Cost	62,016
Accumulated Depreciation	22,473
Total Cost, Net of Accumulated Depreciation	39,543
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Portfolio Balance (SITE) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 14,912
Buildings & Improvements, Initial Cost	216,871
Land, Total Cost	14,913
Buildings & Improvements, Total Cost	216,867
Total Cost	231,780
Accumulated Depreciation	112,166
Total Cost, Net of Accumulated Depreciation	119,614
Encumbrances	$ 0