Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 847,077
Buildings & Improvements, Initial Cost	2,953,043
Improvements, Initial Cost	1,920
Land, Total Cost	893,709
Buildings & Improvements, Total Cost	3,816,103
Total Cost	4,709,812	$ 4,627,866	$ 8,248,003
Accumulated Depreciation	1,289,148
Total Cost, Net of Accumulated Depreciation	3,420,664
Encumbrances	94,196
The changes in Total Real Estate Assets for the three years ended December 31, are as follows:
Balance at beginning of year	4,627,866	8,248,003	9,244,058
Acquisitions	80,771	34,675	82,137
Developments, improvements and expansions	109,830	120,325	119,651
Adjustments of property carrying values (Impairments)	(3,370)	(56,317)	(345,282)
Disposals	(105,285)	(998,776)	(852,561)
Spin-off of RVI	0	(2,720,044)	0
Balance at end of year	4,709,812	4,627,866	8,248,003
The changes in Accumulated Depreciation and Amortization for the three years ended December 31, are as follows:
Balance at beginning of year	1,172,357	1,953,479	1,996,176
Depreciation for year	147,372	207,902	285,484
Disposals	(30,581)	(268,405)	(328,181)
Spin-off of RVI	0	(720,619)	0
Balance at end of year	1,289,148	$ 1,172,357	$ 1,953,479
Phoenix, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	18,701
Buildings & Improvements, Initial Cost	18,811
Improvements, Initial Cost	118
Land, Total Cost	18,701
Buildings & Improvements, Total Cost	23,707
Total Cost	42,408
Accumulated Depreciation	9,956
Total Cost, Net of Accumulated Depreciation	32,452
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	22,813
Improvements, Initial Cost	1,601
Land, Total Cost	15,352
Buildings & Improvements, Total Cost	29,353
Total Cost	44,705
Accumulated Depreciation	17,516
Total Cost, Net of Accumulated Depreciation	27,189
Encumbrances	$ 28,578
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
Improvements, Initial Cost	0
Land, Total Cost	18,399
Buildings & Improvements, Total Cost	42,292
Total Cost	60,691
Accumulated Depreciation	12,226
Total Cost, Net of Accumulated Depreciation	48,465
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Buena Park, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,269
Buildings & Improvements, Initial Cost	21,427
Improvements, Initial Cost	0
Land, Total Cost	27,269
Buildings & Improvements, Total Cost	26,786
Total Cost	54,055
Accumulated Depreciation	3,948
Total Cost, Net of Accumulated Depreciation	50,107
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
Improvements, Initial Cost	0
Land, Total Cost	23,861
Buildings & Improvements, Total Cost	61,645
Total Cost	85,506
Accumulated Depreciation	11,353
Total Cost, Net of Accumulated Depreciation	74,153
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Long Beach, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 0
Buildings & Improvements, Initial Cost	147,918
Improvements, Initial Cost	0
Land, Total Cost	0
Buildings & Improvements, Total Cost	196,967
Total Cost	196,967
Accumulated Depreciation	87,465
Total Cost, Net of Accumulated Depreciation	109,502
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
Improvements, Initial Cost	0
Land, Total Cost	4,361
Buildings & Improvements, Total Cost	33,538
Total Cost	37,899
Accumulated Depreciation	7,437
Total Cost, Net of Accumulated Depreciation	30,462
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
Improvements, Initial Cost	0
Land, Total Cost	23,574
Buildings & Improvements, Total Cost	68,003
Total Cost	91,577
Accumulated Depreciation	12,731
Total Cost, Net of Accumulated Depreciation	78,846
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
Improvements, Initial Cost	0
Land, Total Cost	10,464
Buildings & Improvements, Total Cost	26,089
Total Cost	36,553
Accumulated Depreciation	12,968
Total Cost, Net of Accumulated Depreciation	23,585
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
Improvements, Initial Cost	0
Land, Total Cost	9,075
Buildings & Improvements, Total Cost	68,419
Total Cost	77,494
Accumulated Depreciation	42,695
Total Cost, Net of Accumulated Depreciation	34,799
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
Improvements, Initial Cost	0
Land, Total Cost	9,001
Buildings & Improvements, Total Cost	56,810
Total Cost	65,811
Accumulated Depreciation	14,135
Total Cost, Net of Accumulated Depreciation	51,676
Encumbrances	$ 16,437
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
Improvements, Initial Cost	0
Land, Total Cost	20,804
Buildings & Improvements, Total Cost	29,733
Total Cost	50,537
Accumulated Depreciation	16,069
Total Cost, Net of Accumulated Depreciation	34,468
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Parker, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,632
Buildings & Improvements, Initial Cost	38,256
Improvements, Initial Cost	0
Land, Total Cost	4,632
Buildings & Improvements, Total Cost	41,139
Total Cost	45,771
Accumulated Depreciation	8,206
Total Cost, Net of Accumulated Depreciation	37,565
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
Improvements, Initial Cost	0
Land, Total Cost	6,457
Buildings & Improvements, Total Cost	63,662
Total Cost	70,119
Accumulated Depreciation	7,827
Total Cost, Net of Accumulated Depreciation	62,292
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
Improvements, Initial Cost	0
Land, Total Cost	6,090
Buildings & Improvements, Total Cost	12,509
Total Cost	18,599
Accumulated Depreciation	5,215
Total Cost, Net of Accumulated Depreciation	13,384
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Brandon, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 0
Buildings & Improvements, Initial Cost	4,111
Improvements, Initial Cost	0
Land, Total Cost	0
Buildings & Improvements, Total Cost	9,077
Total Cost	9,077
Accumulated Depreciation	2,468
Total Cost, Net of Accumulated Depreciation	6,609
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
Improvements, Initial Cost	0
Land, Total Cost	4,775
Buildings & Improvements, Total Cost	19,165
Total Cost	23,940
Accumulated Depreciation	6,729
Total Cost, Net of Accumulated Depreciation	17,211
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
Improvements, Initial Cost	0
Land, Total Cost	2,938
Buildings & Improvements, Total Cost	13,999
Total Cost	16,937
Accumulated Depreciation	3,271
Total Cost, Net of Accumulated Depreciation	13,666
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Melbourne, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,111
Buildings & Improvements, Initial Cost	7,325
Improvements, Initial Cost	0
Land, Total Cost	3,111
Buildings & Improvements, Total Cost	7,486
Total Cost	10,597
Accumulated Depreciation	326
Total Cost, Net of Accumulated Depreciation	10,271
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
Improvements, Initial Cost	0
Land, Total Cost	26,743
Buildings & Improvements, Total Cost	120,901
Total Cost	147,644
Accumulated Depreciation	46,777
Total Cost, Net of Accumulated Depreciation	100,867
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
Improvements, Initial Cost	0
Land, Total Cost	10,172
Buildings & Improvements, Total Cost	41,822
Total Cost	51,994
Accumulated Depreciation	8,181
Total Cost, Net of Accumulated Depreciation	43,813
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
Improvements, Initial Cost	0
Land, Total Cost	12,836
Buildings & Improvements, Total Cost	79,817
Total Cost	92,653
Accumulated Depreciation	8,687
Total Cost, Net of Accumulated Depreciation	83,966
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2016
Palm Harbor, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,137
Buildings & Improvements, Initial Cost	4,089
Improvements, Initial Cost	0
Land, Total Cost	1,137
Buildings & Improvements, Total Cost	5,172
Total Cost	6,309
Accumulated Depreciation	3,906
Total Cost, Net of Accumulated Depreciation	2,403
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
Improvements, Initial Cost	0
Land, Total Cost	22,112
Buildings & Improvements, Total Cost	97,953
Total Cost	120,065
Accumulated Depreciation	44,934
Total Cost, Net of Accumulated Depreciation	75,131
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Tampa, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,000
Buildings & Improvements, Initial Cost	10,907
Improvements, Initial Cost	0
Land, Total Cost	10,000
Buildings & Improvements, Total Cost	10,907
Total Cost	20,907
Accumulated Depreciation	35
Total Cost, Net of Accumulated Depreciation	20,872
Encumbrances	$ 9,100
Date of Construction (C) Acquisition (A)	2019
Winter Garden, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 38,945
Buildings & Improvements, Initial Cost	130,382
Improvements, Initial Cost	0
Land, Total Cost	38,945
Buildings & Improvements, Total Cost	137,590
Total Cost	176,535
Accumulated Depreciation	30,895
Total Cost, Net of Accumulated Depreciation	145,640
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
Improvements, Initial Cost	0
Land, Total Cost	14,078
Buildings & Improvements, Total Cost	47,843
Total Cost	61,921
Accumulated Depreciation	15,259
Total Cost, Net of Accumulated Depreciation	46,662
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2009
Cumming, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 14,249
Buildings & Improvements, Initial Cost	23,653
Improvements, Initial Cost	0
Land, Total Cost	14,249
Buildings & Improvements, Total Cost	26,291
Total Cost	40,540
Accumulated Depreciation	14,589
Total Cost, Net of Accumulated Depreciation	25,951
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
Improvements, Initial Cost	0
Land, Total Cost	6,851
Buildings & Improvements, Total Cost	50,296
Total Cost	57,147
Accumulated Depreciation	11,686
Total Cost, Net of Accumulated Depreciation	45,461
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
Improvements, Initial Cost	0
Land, Total Cost	3,391
Buildings & Improvements, Total Cost	8,420
Total Cost	11,811
Accumulated Depreciation	396
Total Cost, Net of Accumulated Depreciation	11,415
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
Improvements, Initial Cost	0
Land, Total Cost	2,839
Buildings & Improvements, Total Cost	6,723
Total Cost	9,562
Accumulated Depreciation	276
Total Cost, Net of Accumulated Depreciation	9,286
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
Improvements, Initial Cost	0
Land, Total Cost	7,894
Buildings & Improvements, Total Cost	27,422
Total Cost	35,316
Accumulated Depreciation	11,575
Total Cost, Net of Accumulated Depreciation	23,741
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
Improvements, Initial Cost	0
Land, Total Cost	10,342
Buildings & Improvements, Total Cost	58,361
Total Cost	68,703
Accumulated Depreciation	24,984
Total Cost, Net of Accumulated Depreciation	43,719
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
Improvements, Initial Cost	0
Land, Total Cost	13,335
Buildings & Improvements, Total Cost	35,553
Total Cost	48,888
Accumulated Depreciation	18,200
Total Cost, Net of Accumulated Depreciation	30,688
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
Improvements, Initial Cost	0
Land, Total Cost	22,642
Buildings & Improvements, Total Cost	83,282
Total Cost	105,924
Accumulated Depreciation	15,651
Total Cost, Net of Accumulated Depreciation	90,273
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
Improvements, Initial Cost	0
Land, Total Cost	23,588
Buildings & Improvements, Total Cost	45,948
Total Cost	69,536
Accumulated Depreciation	5,126
Total Cost, Net of Accumulated Depreciation	64,410
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
Improvements, Initial Cost	0
Land, Total Cost	27,466
Buildings & Improvements, Total Cost	96,912
Total Cost	124,378
Accumulated Depreciation	19,721
Total Cost, Net of Accumulated Depreciation	104,657
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Merriam, KS [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,043
Buildings & Improvements, Initial Cost	55,028
Improvements, Initial Cost	0
Land, Total Cost	15,043
Buildings & Improvements, Total Cost	55,906
Total Cost	70,949
Accumulated Depreciation	11,443
Total Cost, Net of Accumulated Depreciation	59,506
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
Improvements, Initial Cost	0
Land, Total Cost	9,462
Buildings & Improvements, Total Cost	59,325
Total Cost	68,787
Accumulated Depreciation	32,153
Total Cost, Net of Accumulated Depreciation	36,634
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
Improvements, Initial Cost	0
Land, Total Cost	75,675
Buildings & Improvements, Total Cost	199,879
Total Cost	275,554
Accumulated Depreciation	42,520
Total Cost, Net of Accumulated Depreciation	233,034
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
Improvements, Initial Cost	0
Land, Total Cost	10,018
Buildings & Improvements, Total Cost	40,541
Total Cost	50,559
Accumulated Depreciation	22,727
Total Cost, Net of Accumulated Depreciation	27,832
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
Improvements, Initial Cost	0
Land, Total Cost	3,847
Buildings & Improvements, Total Cost	29,427
Total Cost	33,274
Accumulated Depreciation	11,205
Total Cost, Net of Accumulated Depreciation	22,069
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
Improvements, Initial Cost	0
Land, Total Cost	7,714
Buildings & Improvements, Total Cost	34,758
Total Cost	42,472
Accumulated Depreciation	12,955
Total Cost, Net of Accumulated Depreciation	29,517
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
Improvements, Initial Cost	0
Land, Total Cost	3,166
Buildings & Improvements, Total Cost	3,822
Total Cost	6,988
Accumulated Depreciation	1,277
Total Cost, Net of Accumulated Depreciation	5,711
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
Improvements, Initial Cost	0
Land, Total Cost	11,774
Buildings & Improvements, Total Cost	91,065
Total Cost	102,839
Accumulated Depreciation	43,807
Total Cost, Net of Accumulated Depreciation	59,032
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Princeton, NJ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 13,448
Buildings & Improvements, Initial Cost	74,249
Improvements, Initial Cost	0
Land, Total Cost	14,455
Buildings & Improvements, Total Cost	113,286
Total Cost	127,741
Accumulated Depreciation	62,763
Total Cost, Net of Accumulated Depreciation	64,978
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1997
West Long Branch, NJ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 14,131
Buildings & Improvements, Initial Cost	51,982
Improvements, Initial Cost	0
Land, Total Cost	14,131
Buildings & Improvements, Total Cost	80,533
Total Cost	94,664
Accumulated Depreciation	33,506
Total Cost, Net of Accumulated Depreciation	61,158
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2004
Charlotte, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,707
Buildings & Improvements, Initial Cost	45,021
Improvements, Initial Cost	0
Land, Total Cost	27,707
Buildings & Improvements, Total Cost	50,804
Total Cost	78,511
Accumulated Depreciation	15,435
Total Cost, Net of Accumulated Depreciation	63,076
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
Improvements, Initial Cost	0
Land, Total Cost	11,224
Buildings & Improvements, Total Cost	96,903
Total Cost	108,127
Accumulated Depreciation	23,120
Total Cost, Net of Accumulated Depreciation	85,007
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
Improvements, Initial Cost	0
Land, Total Cost	8,022
Buildings & Improvements, Total Cost	53,337
Total Cost	61,359
Accumulated Depreciation	9,158
Total Cost, Net of Accumulated Depreciation	52,201
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
Improvements, Initial Cost	0
Land, Total Cost	4,382
Buildings & Improvements, Total Cost	21,247
Total Cost	25,629
Accumulated Depreciation	10,025
Total Cost, Net of Accumulated Depreciation	15,604
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
Improvements, Initial Cost	0
Land, Total Cost	19,572
Buildings & Improvements, Total Cost	74,777
Total Cost	94,349
Accumulated Depreciation	12,753
Total Cost, Net of Accumulated Depreciation	81,596
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
Improvements, Initial Cost	0
Land, Total Cost	14,078
Buildings & Improvements, Total Cost	72,398
Total Cost	86,476
Accumulated Depreciation	42,579
Total Cost, Net of Accumulated Depreciation	43,897
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
Improvements, Initial Cost	0
Land, Total Cost	20,666
Buildings & Improvements, Total Cost	71,453
Total Cost	92,119
Accumulated Depreciation	19,203
Total Cost, Net of Accumulated Depreciation	72,916
Encumbrances	$ 40,081
Date of Construction (C) Acquisition (A)	2011
Dublin, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,609
Buildings & Improvements, Initial Cost	11,546
Improvements, Initial Cost	0
Land, Total Cost	3,609
Buildings & Improvements, Total Cost	15,610
Total Cost	19,219
Accumulated Depreciation	10,110
Total Cost, Net of Accumulated Depreciation	9,109
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1998
Mason, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,032
Buildings & Improvements, Initial Cost	23,788
Improvements, Initial Cost	0
Land, Total Cost	2,032
Buildings & Improvements, Total Cost	26,830
Total Cost	28,862
Accumulated Depreciation	5,111
Total Cost, Net of Accumulated Depreciation	23,751
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
Improvements, Initial Cost	0
Land, Total Cost	993
Buildings & Improvements, Total Cost	39,705
Total Cost	40,698
Accumulated Depreciation	23,257
Total Cost, Net of Accumulated Depreciation	17,441
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	3,803
Improvements, Initial Cost	201
Land, Total Cost	424
Buildings & Improvements, Total Cost	28,981
Total Cost	29,405
Accumulated Depreciation	4,464
Total Cost, Net of Accumulated Depreciation	24,941
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
Improvements, Initial Cost	0
Land, Total Cost	20,208
Buildings & Improvements, Total Cost	59,651
Total Cost	79,859
Accumulated Depreciation	15,317
Total Cost, Net of Accumulated Depreciation	64,542
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
Improvements, Initial Cost	0
Land, Total Cost	10,122
Buildings & Improvements, Total Cost	37,457
Total Cost	47,579
Accumulated Depreciation	231
Total Cost, Net of Accumulated Depreciation	47,348
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2019
Mount Pleasant, SC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,430
Buildings & Improvements, Initial Cost	10,470
Improvements, Initial Cost	0
Land, Total Cost	2,341
Buildings & Improvements, Total Cost	22,798
Total Cost	25,139
Accumulated Depreciation	15,214
Total Cost, Net of Accumulated Depreciation	9,925
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
Improvements, Initial Cost	0
Land, Total Cost	6,101
Buildings & Improvements, Total Cost	27,866
Total Cost	33,967
Accumulated Depreciation	6,160
Total Cost, Net of Accumulated Depreciation	27,807
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
Improvements, Initial Cost	0
Land, Total Cost	5,545
Buildings & Improvements, Total Cost	30,551
Total Cost	36,096
Accumulated Depreciation	7,691
Total Cost, Net of Accumulated Depreciation	28,405
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Round Rock, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,467
Buildings & Improvements, Initial Cost	8,839
Improvements, Initial Cost	0
Land, Total Cost	3,467
Buildings & Improvements, Total Cost	8,839
Total Cost	12,306
Accumulated Depreciation	82
Total Cost, Net of Accumulated Depreciation	12,224
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
Improvements, Initial Cost	0
Land, Total Cost	4,873
Buildings & Improvements, Total Cost	52,387
Total Cost	57,260
Accumulated Depreciation	26,553
Total Cost, Net of Accumulated Depreciation	30,707
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
Improvements, Initial Cost	0
Land, Total Cost	10,158
Buildings & Improvements, Total Cost	114,747
Total Cost	124,905
Accumulated Depreciation	42,616
Total Cost, Net of Accumulated Depreciation	82,289
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
Improvements, Initial Cost	0
Land, Total Cost	2,381
Buildings & Improvements, Total Cost	24,481
Total Cost	26,862
Accumulated Depreciation	10,596
Total Cost, Net of Accumulated Depreciation	16,266
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Fairfax, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,681
Buildings & Improvements, Initial Cost	68,536
Improvements, Initial Cost	0
Land, Total Cost	15,681
Buildings & Improvements, Total Cost	70,343
Total Cost	86,024
Accumulated Depreciation	14,504
Total Cost, Net of Accumulated Depreciation	71,520
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Richmond, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 11,879
Buildings & Improvements, Initial Cost	34,736
Improvements, Initial Cost	0
Land, Total Cost	11,879
Buildings & Improvements, Total Cost	36,751
Total Cost	48,630
Accumulated Depreciation	15,143
Total Cost, Net of Accumulated Depreciation	33,487
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
Improvements, Initial Cost	0
Land, Total Cost	17,016
Buildings & Improvements, Total Cost	44,694
Total Cost	61,710
Accumulated Depreciation	17,461
Total Cost, Net of Accumulated Depreciation	44,249
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Portfolio Balance (SITE) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 28,459
Buildings & Improvements, Initial Cost	213,359
Improvements, Initial Cost	0
Land, Total Cost	28,459
Buildings & Improvements, Total Cost	213,359
Total Cost	241,818
Accumulated Depreciation	104,590
Total Cost, Net of Accumulated Depreciation	137,228
Encumbrances	$ 0