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Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate Properties [Line Items]
Initial Basis	$ 1,088,613
Cost capitalized subsequent to acquisition	1,195,513
Land and Land Improvements	511,529
Buildings and Improvements, Gross	1,566,686
Construction in progress	205,911	$ 69,477
Real Estate Investment Property, at Cost, Total	2,284,126	2,124,796	$ 2,081,597	$ 1,948,165
Accumulated Depreciation	650,113	607,706	$ 563,474	$ 525,518
Book Value	1,634,013	1,517,090
Fixed rate mortgages	941,456	827,603
Development land, related debt	0	$ 144,607
Total, related debt	949,028
Shopping Centers
Real Estate Properties [Line Items]
Initial Basis	835,537
Cost capitalized subsequent to acquisition	475,318
Land and Land Improvements	420,132
Buildings and Improvements, Gross	882,799
Construction in progress	7,924
Real Estate Investment Property, at Cost, Total	1,310,855
Accumulated Depreciation	431,865
Book Value	878,990
Fixed rate mortgages	559,798
Shopping Centers | Ashbrook Marketplace, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis	8,938
Cost capitalized subsequent to acquisition	24,822
Land and Land Improvements	13,258
Buildings and Improvements, Gross	20,092
Construction in progress	410
Real Estate Investment Property, at Cost, Total	33,760
Accumulated Depreciation	1,187
Book Value	32,573
Fixed rate mortgages	$ 21,329
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Ashburn Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis	$ 11,431
Cost capitalized subsequent to acquisition	20,570
Land and Land Improvements	6,764
Buildings and Improvements, Gross	25,237
Construction in progress	0
Real Estate Investment Property, at Cost, Total	32,001
Accumulated Depreciation	15,755
Book Value	16,246
Fixed rate mortgages	$ 24,186
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA
Real Estate Properties [Line Items]
Initial Basis	$ 1,178
Cost capitalized subsequent to acquisition	5,298
Land and Land Improvements	1,178
Buildings and Improvements, Gross	5,298
Construction in progress	0
Real Estate Investment Property, at Cost, Total	6,476
Accumulated Depreciation	2,661
Book Value	3,815
Fixed rate mortgages	$ 0
Shopping Centers | Ashland Square Phase I, Dumfries, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	20 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Beacon Center, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis	$ 24,161
Cost capitalized subsequent to acquisition	18,514
Land and Land Improvements	22,691
Buildings and Improvements, Gross	19,984
Construction in progress	0
Real Estate Investment Property, at Cost, Total	42,675
Accumulated Depreciation	16,297
Book Value	26,378
Fixed rate mortgages	$ 32,170
Shopping Centers | Beacon Center, Alexandria, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Beacon Center, Alexandria, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | BJ’s Wholesale Club, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis	$ 22,623
Cost capitalized subsequent to acquisition	0
Land and Land Improvements	22,623
Buildings and Improvements, Gross	0
Construction in progress	0
Real Estate Investment Property, at Cost, Total	22,623
Accumulated Depreciation	0
Book Value	22,623
Fixed rate mortgages	$ 9,692
Buildings and Improvements Depreciable Lives in Years	0 years
Shopping Centers | Boca Valley Plaza, Boca Raton, FL
Real Estate Properties [Line Items]
Initial Basis	$ 16,720
Cost capitalized subsequent to acquisition	2,630
Land and Land Improvements	5,735
Buildings and Improvements, Gross	13,615
Construction in progress	0
Real Estate Investment Property, at Cost, Total	19,350
Accumulated Depreciation	6,159
Book Value	13,191
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Boulevard, Fairfax, VA
Real Estate Properties [Line Items]
Initial Basis	$ 4,883
Cost capitalized subsequent to acquisition	4,753
Land and Land Improvements	3,687
Buildings and Improvements, Gross	5,949
Construction in progress	0
Real Estate Investment Property, at Cost, Total	9,636
Accumulated Depreciation	3,686
Book Value	5,950
Fixed rate mortgages	$ 14,639
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Briggs Chaney MarketPlace, Silver Spring, MD
Real Estate Properties [Line Items]
Initial Basis	$ 27,037
Cost capitalized subsequent to acquisition	5,316
Land and Land Improvements	9,789
Buildings and Improvements, Gross	22,564
Construction in progress	0
Real Estate Investment Property, at Cost, Total	32,353
Accumulated Depreciation	10,640
Book Value	21,713
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Broadlands Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis	$ 5,316
Cost capitalized subsequent to acquisition	35,941
Land and Land Improvements	5,300
Buildings and Improvements, Gross	35,951
Construction in progress	6
Real Estate Investment Property, at Cost, Total	41,257
Accumulated Depreciation	14,808
Book Value	26,449
Fixed rate mortgages	$ 29,613
Shopping Centers | Broadlands Village, Ashburn, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Broadlands Village, Ashburn, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Burtonsville Town Square, Burtonsville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 74,212
Cost capitalized subsequent to acquisition	6,344
Land and Land Improvements	28,402
Buildings and Improvements, Gross	52,138
Construction in progress	16
Real Estate Investment Property, at Cost, Total	80,556
Accumulated Depreciation	6,740
Book Value	73,816
Fixed rate mortgages	$ 34,558
Shopping Centers | Burtonsville Town Square, Burtonsville, MD | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	20 years
Shopping Centers | Burtonsville Town Square, Burtonsville, MD | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	45 years
Shopping Centers | Countryside Marketplace, Sterling, VA
Real Estate Properties [Line Items]
Initial Basis	$ 28,912
Cost capitalized subsequent to acquisition	4,297
Land and Land Improvements	7,666
Buildings and Improvements, Gross	25,543
Construction in progress	0
Real Estate Investment Property, at Cost, Total	33,209
Accumulated Depreciation	12,193
Book Value	21,016
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Cranberry Square, Westminster, MD
Real Estate Properties [Line Items]
Initial Basis	$ 31,578
Cost capitalized subsequent to acquisition	788
Land and Land Improvements	6,700
Buildings and Improvements, Gross	25,666
Construction in progress	0
Real Estate Investment Property, at Cost, Total	32,366
Accumulated Depreciation	6,834
Book Value	25,532
Fixed rate mortgages	$ 14,634
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Cruse MarketPlace, Cumming, GA
Real Estate Properties [Line Items]
Initial Basis	$ 12,226
Cost capitalized subsequent to acquisition	767
Land and Land Improvements	3,901
Buildings and Improvements, Gross	9,092
Construction in progress	0
Real Estate Investment Property, at Cost, Total	12,993
Accumulated Depreciation	4,185
Book Value	8,808
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Flagship Center, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 160
Cost capitalized subsequent to acquisition	409
Land and Land Improvements	169
Buildings and Improvements, Gross	400
Construction in progress	0
Real Estate Investment Property, at Cost, Total	569
Accumulated Depreciation	13
Book Value	556
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	0 years
Shopping Centers | French Market, Oklahoma City, OK
Real Estate Properties [Line Items]
Initial Basis	$ 5,781
Cost capitalized subsequent to acquisition	16,888
Land and Land Improvements	1,118
Buildings and Improvements, Gross	21,551
Construction in progress	0
Real Estate Investment Property, at Cost, Total	22,669
Accumulated Depreciation	13,455
Book Value	9,214
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Germantown, Germantown, MD
Real Estate Properties [Line Items]
Initial Basis	$ 2,034
Cost capitalized subsequent to acquisition	566
Land and Land Improvements	2,034
Buildings and Improvements, Gross	566
Construction in progress	0
Real Estate Investment Property, at Cost, Total	2,600
Accumulated Depreciation	467
Book Value	2,133
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | The Glen, Woodbridge, VA
Real Estate Properties [Line Items]
Initial Basis	$ 12,918
Cost capitalized subsequent to acquisition	8,559
Land and Land Improvements	5,300
Buildings and Improvements, Gross	16,177
Construction in progress	0
Real Estate Investment Property, at Cost, Total	21,477
Accumulated Depreciation	11,099
Book Value	10,378
Fixed rate mortgages	$ 21,393
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Great Falls Center, Great Falls, VA
Real Estate Properties [Line Items]
Initial Basis	$ 41,750
Cost capitalized subsequent to acquisition	3,215
Land and Land Improvements	14,766
Buildings and Improvements, Gross	30,199
Construction in progress	0
Real Estate Investment Property, at Cost, Total	44,965
Accumulated Depreciation	11,255
Book Value	33,710
Fixed rate mortgages	$ 8,651
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Hampshire Langley, Takoma, MD
Real Estate Properties [Line Items]
Initial Basis	$ 3,159
Cost capitalized subsequent to acquisition	3,444
Land and Land Improvements	1,892
Buildings and Improvements, Gross	4,701
Construction in progress	10
Real Estate Investment Property, at Cost, Total	6,603
Accumulated Depreciation	4,106
Book Value	2,497
Fixed rate mortgages	$ 12,868
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Hunt Club Corners, Apopka, FL
Real Estate Properties [Line Items]
Initial Basis	$ 12,584
Cost capitalized subsequent to acquisition	4,644
Land and Land Improvements	4,822
Buildings and Improvements, Gross	12,406
Construction in progress	0
Real Estate Investment Property, at Cost, Total	17,228
Accumulated Depreciation	5,742
Book Value	11,486
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Jamestown Place, Altamonte Springs, FL
Real Estate Properties [Line Items]
Initial Basis	$ 14,055
Cost capitalized subsequent to acquisition	2,410
Land and Land Improvements	4,455
Buildings and Improvements, Gross	12,010
Construction in progress	0
Real Estate Investment Property, at Cost, Total	16,465
Accumulated Depreciation	5,141
Book Value	11,324
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Kentlands Square I, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis	$ 14,379
Cost capitalized subsequent to acquisition	3,234
Land and Land Improvements	5,005
Buildings and Improvements, Gross	11,928
Construction in progress	680
Real Estate Investment Property, at Cost, Total	17,613
Accumulated Depreciation	4,819
Book Value	12,794
Fixed rate mortgages	$ 21,385
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Kentlands Square II, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis	$ 76,723
Cost capitalized subsequent to acquisition	3,101
Land and Land Improvements	23,133
Buildings and Improvements, Gross	56,530
Construction in progress	161
Real Estate Investment Property, at Cost, Total	79,824
Accumulated Depreciation	16,654
Book Value	63,170
Fixed rate mortgages	$ 31,155
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Kentlands Place, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis	$ 1,425
Cost capitalized subsequent to acquisition	7,649
Land and Land Improvements	1,425
Buildings and Improvements, Gross	7,649
Construction in progress	0
Real Estate Investment Property, at Cost, Total	9,074
Accumulated Depreciation	4,641
Book Value	4,433
Fixed rate mortgages	$ 7,514
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Lansdowne Town Center, Leesburg, VA
Real Estate Properties [Line Items]
Initial Basis	$ 6,545
Cost capitalized subsequent to acquisition	43,461
Land and Land Improvements	6,546
Buildings and Improvements, Gross	43,439
Construction in progress	21
Real Estate Investment Property, at Cost, Total	50,006
Accumulated Depreciation	18,994
Book Value	31,012
Fixed rate mortgages	$ 28,533
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Leesburg Pike Plaza, Baileys Crossroads, VA
Real Estate Properties [Line Items]
Initial Basis	$ 2,418
Cost capitalized subsequent to acquisition	6,367
Land and Land Improvements	1,132
Buildings and Improvements, Gross	7,653
Construction in progress	0
Real Estate Investment Property, at Cost, Total	8,785
Accumulated Depreciation	6,372
Book Value	2,413
Fixed rate mortgages	$ 13,213
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Lumberton Plaza, Lumberton, NJ
Real Estate Properties [Line Items]
Initial Basis	$ 4,400
Cost capitalized subsequent to acquisition	11,614
Land and Land Improvements	950
Buildings and Improvements, Gross	15,042
Construction in progress	22
Real Estate Investment Property, at Cost, Total	16,014
Accumulated Depreciation	13,899
Book Value	2,115
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Metro Pike Center, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 33,123
Cost capitalized subsequent to acquisition	5,004
Land and Land Improvements	26,064
Buildings and Improvements, Gross	8,096
Construction in progress	3,967
Real Estate Investment Property, at Cost, Total	38,127
Accumulated Depreciation	2,321
Book Value	35,806
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Shops at Monocacy, Frederick, MD
Real Estate Properties [Line Items]
Initial Basis	$ 9,541
Cost capitalized subsequent to acquisition	15,876
Land and Land Improvements	9,260
Buildings and Improvements, Gross	16,157
Construction in progress	0
Real Estate Investment Property, at Cost, Total	25,417
Accumulated Depreciation	6,984
Book Value	18,433
Fixed rate mortgages	$ 27,143
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Northrock, Warrenton, VA
Real Estate Properties [Line Items]
Initial Basis	$ 12,686
Cost capitalized subsequent to acquisition	15,428
Land and Land Improvements	12,686
Buildings and Improvements, Gross	15,422
Construction in progress	6
Real Estate Investment Property, at Cost, Total	28,114
Accumulated Depreciation	5,862
Book Value	22,252
Fixed rate mortgages	$ 13,108
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Olde Forte Village, Ft. Washington, MD
Real Estate Properties [Line Items]
Initial Basis	$ 15,933
Cost capitalized subsequent to acquisition	6,913
Land and Land Improvements	5,409
Buildings and Improvements, Gross	17,437
Construction in progress	0
Real Estate Investment Property, at Cost, Total	22,846
Accumulated Depreciation	9,088
Book Value	13,758
Fixed rate mortgages	$ 20,682
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Olney, Olney, MD
Real Estate Properties [Line Items]
Initial Basis	$ 4,963
Cost capitalized subsequent to acquisition	2,998
Land and Land Improvements	3,079
Buildings and Improvements, Gross	4,882
Construction in progress	0
Real Estate Investment Property, at Cost, Total	7,961
Accumulated Depreciation	3,492
Book Value	4,469
Fixed rate mortgages	$ 12,299
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Orchard Park, Dunwoody, GA
Real Estate Properties [Line Items]
Initial Basis	$ 19,377
Cost capitalized subsequent to acquisition	1,607
Land and Land Improvements	7,751
Buildings and Improvements, Gross	13,233
Construction in progress	0
Real Estate Investment Property, at Cost, Total	20,984
Accumulated Depreciation	4,876
Book Value	16,108
Fixed rate mortgages	$ 8,812
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Palm Springs Center, Altamonte Springs, FL
Real Estate Properties [Line Items]
Initial Basis	$ 18,365
Cost capitalized subsequent to acquisition	2,034
Land and Land Improvements	5,739
Buildings and Improvements, Gross	14,658
Construction in progress	2
Real Estate Investment Property, at Cost, Total	20,399
Accumulated Depreciation	6,532
Book Value	13,867
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Ravenwood, Baltimore, MD
Real Estate Properties [Line Items]
Initial Basis	$ 1,245
Cost capitalized subsequent to acquisition	4,428
Land and Land Improvements	703
Buildings and Improvements, Gross	4,970
Construction in progress	0
Real Estate Investment Property, at Cost, Total	5,673
Accumulated Depreciation	3,542
Book Value	2,131
Fixed rate mortgages	$ 12,553
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | 11503 Rockville Pike/5541 Nicholson Lane, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 26,561
Cost capitalized subsequent to acquisition	24
Land and Land Improvements	22,113
Buildings and Improvements, Gross	4,472
Construction in progress	0
Real Estate Investment Property, at Cost, Total	26,585
Accumulated Depreciation	1,260
Book Value	25,325
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | 1500/1580/1582 Rockville Pike, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 45,351
Cost capitalized subsequent to acquisition	2,046
Land and Land Improvements	38,065
Buildings and Improvements, Gross	7,050
Construction in progress	2,282
Real Estate Investment Property, at Cost, Total	47,397
Accumulated Depreciation	6,474
Book Value	40,923
Fixed rate mortgages	0
Shopping Centers | Seabreeze Plaza, Palm Harbor, FL
Real Estate Properties [Line Items]
Initial Basis	24,526
Cost capitalized subsequent to acquisition	2,625
Land and Land Improvements	8,665
Buildings and Improvements, Gross	18,486
Construction in progress	0
Real Estate Investment Property, at Cost, Total	27,151
Accumulated Depreciation	7,886
Book Value	19,265
Fixed rate mortgages	$ 13,897
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Market Place at Sea Colony, Bethany Beach, DE
Real Estate Properties [Line Items]
Initial Basis	$ 2,920
Cost capitalized subsequent to acquisition	261
Land and Land Improvements	1,147
Buildings and Improvements, Gross	2,034
Construction in progress	0
Real Estate Investment Property, at Cost, Total	3,181
Accumulated Depreciation	732
Book Value	2,449
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Seven Corners, Falls Church, VA
Real Estate Properties [Line Items]
Initial Basis	$ 4,848
Cost capitalized subsequent to acquisition	46,301
Land and Land Improvements	4,929
Buildings and Improvements, Gross	46,220
Construction in progress	0
Real Estate Investment Property, at Cost, Total	51,149
Accumulated Depreciation	33,039
Book Value	18,110
Fixed rate mortgages	$ 56,413
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Severna Park Marketplace, Severna Park, MD
Real Estate Properties [Line Items]
Initial Basis	$ 63,254
Cost capitalized subsequent to acquisition	714
Land and Land Improvements	12,700
Buildings and Improvements, Gross	51,214
Construction in progress	54
Real Estate Investment Property, at Cost, Total	63,968
Accumulated Depreciation	13,187
Book Value	50,781
Fixed rate mortgages	$ 27,197
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Shops at Fairfax, Fairfax, VA
Real Estate Properties [Line Items]
Initial Basis	$ 2,708
Cost capitalized subsequent to acquisition	11,112
Land and Land Improvements	992
Buildings and Improvements, Gross	12,828
Construction in progress	0
Real Estate Investment Property, at Cost, Total	13,820
Accumulated Depreciation	9,242
Book Value	4,578
Fixed rate mortgages	$ 9,759
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | Smallwood Village Center, Waldorf, MD
Real Estate Properties [Line Items]
Initial Basis	$ 17,819
Cost capitalized subsequent to acquisition	8,289
Land and Land Improvements	6,402
Buildings and Improvements, Gross	19,706
Construction in progress	0
Real Estate Investment Property, at Cost, Total	26,108
Accumulated Depreciation	10,406
Book Value	15,702
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Southdale, Glen Burnie, MD
Real Estate Properties [Line Items]
Initial Basis	$ 18,895
Cost capitalized subsequent to acquisition	25,481
Land and Land Improvements	15,255
Buildings and Improvements, Gross	29,051
Construction in progress	70
Real Estate Investment Property, at Cost, Total	44,376
Accumulated Depreciation	23,742
Book Value	20,634
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Southside Plaza, Richmond, VA
Real Estate Properties [Line Items]
Initial Basis	$ 6,728
Cost capitalized subsequent to acquisition	11,442
Land and Land Improvements	1,878
Buildings and Improvements, Gross	16,292
Construction in progress	0
Real Estate Investment Property, at Cost, Total	18,170
Accumulated Depreciation	13,508
Book Value	4,662
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | South Dekalb Plaza, Atlanta, GA
Real Estate Properties [Line Items]
Initial Basis	$ 2,474
Cost capitalized subsequent to acquisition	4,953
Land and Land Improvements	615
Buildings and Improvements, Gross	6,812
Construction in progress	0
Real Estate Investment Property, at Cost, Total	7,427
Accumulated Depreciation	5,218
Book Value	2,209
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Thruway, Winston-Salem, NC
Real Estate Properties [Line Items]
Initial Basis	$ 7,848
Cost capitalized subsequent to acquisition	27,273
Land and Land Improvements	7,692
Buildings and Improvements, Gross	27,413
Construction in progress	16
Real Estate Investment Property, at Cost, Total	35,121
Accumulated Depreciation	20,564
Book Value	14,557
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Village Center, Centreville, VA
Real Estate Properties [Line Items]
Initial Basis	$ 16,502
Cost capitalized subsequent to acquisition	3,304
Land and Land Improvements	7,851
Buildings and Improvements, Gross	11,955
Construction in progress	0
Real Estate Investment Property, at Cost, Total	19,806
Accumulated Depreciation	8,145
Book Value	11,661
Fixed rate mortgages	$ 11,528
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Westview Village, Frederick, MD
Real Estate Properties [Line Items]
Initial Basis	$ 6,047
Cost capitalized subsequent to acquisition	25,288
Land and Land Improvements	6,047
Buildings and Improvements, Gross	25,288
Construction in progress	0
Real Estate Investment Property, at Cost, Total	31,335
Accumulated Depreciation	11,361
Book Value	19,974
Fixed rate mortgages	$ 0
Buildings and Improvements Depreciable Lives in Years	50 years
Shopping Centers | White Oak, Silver Spring, MD
Real Estate Properties [Line Items]
Initial Basis	$ 6,277
Cost capitalized subsequent to acquisition	6,134
Land and Land Improvements	4,649
Buildings and Improvements, Gross	7,561
Construction in progress	201
Real Estate Investment Property, at Cost, Total	12,411
Accumulated Depreciation	6,472
Book Value	5,939
Fixed rate mortgages	$ 20,874
Buildings and Improvements Depreciable Lives in Years	40 years
Shopping Centers | Other Buildings / Improvements
Real Estate Properties [Line Items]
Cost capitalized subsequent to acquisition	$ 182
Buildings and Improvements, Gross	182
Construction in progress	0
Real Estate Investment Property, at Cost, Total	182
Accumulated Depreciation	130
Book Value	52
Fixed rate mortgages	0
Mixed-Use Properties
Real Estate Properties [Line Items]
Initial Basis	96,034
Cost capitalized subsequent to acquisition	670,030
Land and Land Improvements	82,114
Buildings and Improvements, Gross	683,887
Construction in progress	63
Real Estate Investment Property, at Cost, Total	766,064
Accumulated Depreciation	218,248
Book Value	547,816
Fixed rate mortgages	389,230
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis	21,459
Cost capitalized subsequent to acquisition	36,528
Land and Land Improvements	3,756
Buildings and Improvements, Gross	54,231
Construction in progress	0
Real Estate Investment Property, at Cost, Total	57,987
Accumulated Depreciation	41,110
Book Value	16,877
Fixed rate mortgages	$ 24,108
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	35 years
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years	40 years
Mixed-Use Properties | Clarendon Center, Arlington, VA (1)
Real Estate Properties [Line Items]
Initial Basis	$ 12,753
Cost capitalized subsequent to acquisition	187,200
Land and Land Improvements	16,287
Buildings and Improvements, Gross	183,666
Construction in progress	0
Real Estate Investment Property, at Cost, Total	199,953
Accumulated Depreciation	56,237
Book Value	143,716
Fixed rate mortgages	$ 90,600
Buildings and Improvements Depreciable Lives in Years	50 years
Mixed-Use Properties | Park Van Ness, Washington, DC
Real Estate Properties [Line Items]
Initial Basis	$ 2,242
Cost capitalized subsequent to acquisition	91,801
Land and Land Improvements	2,242
Buildings and Improvements, Gross	91,801
Construction in progress	0
Real Estate Investment Property, at Cost, Total	94,043
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Mixed-Use Properties | 601 Pennsylvania Ave., Washington, DC
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Mixed-Use Properties | The Waycroft, Arlington, VA
Real Estate Properties [Line Items]
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Cost capitalized subsequent to acquisition	225,901
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Real Estate Investment Property, at Cost, Total	277,968
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Mixed-Use Properties | Washington Square, Alexandria, VA
Real Estate Properties [Line Items]
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Cost capitalized subsequent to acquisition	57,524
Land and Land Improvements	544
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Development Land
Real Estate Properties [Line Items]
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Development Land | Ashland Square Phase II, Manassas, VA
Real Estate Properties [Line Items]
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Cost capitalized subsequent to acquisition	4,714
Land and Land Improvements	7,049
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Real Estate Investment Property, at Cost, Total	10,006
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Development Land | New Market, New Market, MD
Real Estate Properties [Line Items]
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Cost capitalized subsequent to acquisition	146
Land and Land Improvements	2,234
Buildings and Improvements, Gross	0
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Buildings and Improvements Depreciable Lives in Years
Development Land | Hampden House, Bethesda, MD
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Cost capitalized subsequent to acquisition	17,257
Land and Land Improvements	0
Buildings and Improvements, Gross	0
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Real Estate Investment Property, at Cost, Total	56,898
Accumulated Depreciation	0
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Development land, related debt	$ 0
Buildings and Improvements Depreciable Lives in Years
Development Land | Twinbrook, Rockville, MD
Real Estate Properties [Line Items]
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Cost capitalized subsequent to acquisition	28,048
Land and Land Improvements	0
Buildings and Improvements, Gross	0
Construction in progress	138,069
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Accumulated Depreciation	0
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Buildings and Improvements Depreciable Lives in Years

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