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Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Real Estate Properties [Line Items]        
Initial Basis $ 1,088,613      
Cost capitalized subsequent to acquisition 1,703,534      
Land 562,047      
Buildings and Improvements 1,903,907      
Construction in progress 326,193 $ 514,553    
Total 2,792,147 2,621,105 $ 2,408,136 $ 2,284,126
Accumulated Depreciation 767,842 729,470 $ 688,475 $ 650,113
Total real estate investments, net 2,024,305 1,891,635    
Related debt 1,047,832 935,451    
Development land, related debt 198,616 $ 77,305    
Total, related debt 1,265,689      
Shopping Centers        
Real Estate Properties [Line Items]        
Initial Basis 825,795      
Cost capitalized subsequent to acquisition 512,673      
Land 410,390      
Buildings and Improvements 918,122      
Construction in progress 9,956      
Total 1,338,468      
Accumulated Depreciation 501,264      
Total real estate investments, net 837,204      
Related debt 688,783      
Shopping Centers | Ashbrook, Ashburn, VA        
Real Estate Properties [Line Items]        
Initial Basis 8,938      
Cost capitalized subsequent to acquisition 25,514      
Land 13,258      
Buildings and Improvements 21,194      
Construction in progress 0      
Total 34,452      
Accumulated Depreciation 3,532      
Total real estate investments, net 30,920      
Related debt $ 19,604      
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 21,282      
Land 6,764      
Buildings and Improvements 25,814      
Construction in progress 135      
Total 32,713      
Accumulated Depreciation 17,728      
Total real estate investments, net 14,985      
Related debt $ 50,000      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | Ashburn Village, Ashburn, VA | Minimum        
Real Estate Properties [Line Items]        
Buildings and improvements depreciable lives in years 5 years      
Shopping Centers | Ashburn Village, Ashburn, VA | Maximum        
Real Estate Properties [Line Items]        
Buildings and improvements depreciable lives in years 10 years      
Shopping Centers | Ashland Square Phase I, Manassas, VA        
Real Estate Properties [Line Items]        
Initial Basis $ 1,178      
Cost capitalized subsequent to acquisition 7,508      
Land 1,178      
Buildings and Improvements 7,508      
Construction in progress 0      
Total 8,686      
Accumulated Depreciation 3,625      
Total real estate investments, net 5,061      
Related debt $ 0      
Shopping Centers | Ashland Square Phase I, Manassas, VA | Minimum        
Real Estate Properties [Line Items]        
Buildings and improvements depreciable lives in years 20 years      
Shopping Centers | Ashland Square Phase I, Manassas, 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 18,595      
Land 22,691      
Buildings and Improvements 20,065      
Construction in progress 0      
Total 42,756      
Accumulated Depreciation 17,379      
Total real estate investments, net 25,377      
Related debt $ 52,487      
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 22,623      
Buildings and Improvements 0      
Construction in progress 0      
Total 22,623      
Accumulated Depreciation 0      
Total real estate investments, net 22,623      
Related debt 14,817      
Shopping Centers | Boca Valley Plaza, Boca Raton, FL        
Real Estate Properties [Line Items]        
Initial Basis 16,720      
Cost capitalized subsequent to acquisition 4,076      
Land 5,735      
Buildings and Improvements 15,061      
Construction in progress 0      
Total 20,796      
Accumulated Depreciation 7,644      
Total real estate investments, net 13,152      
Related debt $ 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 4,754      
Land 3,687      
Buildings and Improvements 5,942      
Construction in progress 8      
Total 9,637      
Accumulated Depreciation 4,212      
Total real estate investments, net 5,425      
Related debt $ 8,929      
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 5,976      
Land 9,789      
Buildings and Improvements 23,183      
Construction in progress 41      
Total 33,013      
Accumulated Depreciation 12,824      
Total real estate investments, net 20,189      
Related debt $ 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 37,048      
Land 5,300      
Buildings and Improvements 36,957      
Construction in progress 107      
Total 42,364      
Accumulated Depreciation 17,575      
Total real estate investments, net 24,789      
Related debt $ 27,101      
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 6,363      
Land 28,402      
Buildings and Improvements 52,149      
Construction in progress 24      
Total 80,575      
Accumulated Depreciation 11,500      
Total real estate investments, net 69,075      
Related debt $ 30,874      
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 5,180      
Land 7,666      
Buildings and Improvements 26,378      
Construction in progress 48      
Total 34,092      
Accumulated Depreciation 14,624      
Total real estate investments, net 19,468      
Related debt $ 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 2,254      
Land 6,700      
Buildings and Improvements 27,132      
Construction in progress 0      
Total 33,832      
Accumulated Depreciation 9,129      
Total real estate investments, net 24,703      
Related debt $ 12,468      
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 1,044      
Land 3,901      
Buildings and Improvements 9,369      
Construction in progress 0      
Total 13,270      
Accumulated Depreciation 4,940      
Total real estate investments, net 8,330      
Related debt $ 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 169      
Buildings and Improvements 400      
Construction in progress 0      
Total 569      
Accumulated Depreciation 170      
Total real estate investments, net 399      
Related debt 0      
Shopping Centers | French Market, Oklahoma City, OK        
Real Estate Properties [Line Items]        
Initial Basis 5,781      
Cost capitalized subsequent to acquisition 18,626      
Land 1,118      
Buildings and Improvements 22,806      
Construction in progress 483      
Total 24,407      
Accumulated Depreciation 15,237      
Total real estate investments, net 9,170      
Related debt $ 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 2,034      
Buildings and Improvements 566      
Construction in progress 0      
Total 2,600      
Accumulated Depreciation 497      
Total real estate investments, net 2,103      
Related debt $ 0      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | The Glen, Lake Ridge, VA        
Real Estate Properties [Line Items]        
Initial Basis $ 12,918      
Cost capitalized subsequent to acquisition 8,835      
Land 5,300      
Buildings and Improvements 16,444      
Construction in progress 9      
Total 21,753      
Accumulated Depreciation 11,951      
Total real estate investments, net 9,802      
Related debt $ 19,612      
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 3,582      
Land 14,766      
Buildings and Improvements 30,566      
Construction in progress 0      
Total 45,332      
Accumulated Depreciation 13,833      
Total real estate investments, net 31,499      
Related debt $ 29,751      
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 3,690      
Land 1,892      
Buildings and Improvements 4,947      
Construction in progress 10      
Total 6,849      
Accumulated Depreciation 4,232      
Total real estate investments, net 2,617      
Related debt $ 10,878      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | Hunt Club Corners / Hunt Club Pad Site, Apopka, FL        
Real Estate Properties [Line Items]        
Initial Basis $ 12,584      
Cost capitalized subsequent to acquisition 4,901      
Land 4,822      
Buildings and Improvements 12,654      
Construction in progress 9      
Total 17,485      
Accumulated Depreciation 7,004      
Total real estate investments, net 10,481      
Related debt $ 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 3,506      
Land 4,455      
Buildings and Improvements 13,106      
Construction in progress 0      
Total 17,561      
Accumulated Depreciation 6,329      
Total real estate investments, net 11,232      
Related debt $ 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 3,730      
Land 5,005      
Buildings and Improvements 13,104      
Construction in progress 0      
Total 18,109      
Accumulated Depreciation 6,003      
Total real estate investments, net 12,106      
Related debt $ 18,243      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | Kentlands Square II, III, Gaithersburg, MD        
Real Estate Properties [Line Items]        
Initial Basis $ 76,723      
Cost capitalized subsequent to acquisition 3,990      
Land 23,133      
Buildings and Improvements 57,268      
Construction in progress 312      
Total 80,713      
Accumulated Depreciation 21,022      
Total real estate investments, net 59,691      
Related debt $ 28,465      
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 8,050      
Land 1,425      
Buildings and Improvements 8,044      
Construction in progress 6      
Total 9,475      
Accumulated Depreciation 4,998      
Total real estate investments, net 4,477      
Related debt $ 6,203      
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 44,414      
Land 6,546      
Buildings and Improvements 44,211      
Construction in progress 202      
Total 50,959      
Accumulated Depreciation 22,100      
Total real estate investments, net 28,859      
Related debt $ 0      
Buildings and improvements depreciable lives in years 50 years      
Shopping Centers | Leesburg Pike, Baileys Crossroads, VA        
Real Estate Properties [Line Items]        
Initial Basis $ 2,418      
Cost capitalized subsequent to acquisition 7,039      
Land 1,132      
Buildings and Improvements 8,315      
Construction in progress 10      
Total 9,457      
Accumulated Depreciation 6,702      
Total real estate investments, net 2,755      
Related debt $ 25,864      
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 12,369      
Land 950      
Buildings and Improvements 15,691      
Construction in progress 128      
Total 16,769      
Accumulated Depreciation 13,861      
Total real estate investments, net 2,908      
Related debt $ 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 5,482      
Land 26,064      
Buildings and Improvements 8,493      
Construction in progress 4,048      
Total 38,605      
Accumulated Depreciation 3,199      
Total real estate investments, net 35,406      
Related debt $ 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 16,078      
Land 9,260      
Buildings and Improvements 16,351      
Construction in progress 8      
Total 25,619      
Accumulated Depreciation 8,044      
Total real estate investments, net 17,575      
Related debt $ 24,886      
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 15,514      
Land 12,686      
Buildings and Improvements 15,499      
Construction in progress 15      
Total 28,200      
Accumulated Depreciation 7,092      
Total real estate investments, net 21,108      
Related debt $ 11,597      
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 7,426      
Land 5,409      
Buildings and Improvements 17,940      
Construction in progress 10      
Total 23,359      
Accumulated Depreciation 10,390      
Total real estate investments, net 12,969      
Related debt $ 18,964      
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 3,054      
Land 3,079      
Buildings and Improvements 4,938      
Construction in progress 0      
Total 8,017      
Accumulated Depreciation 3,855      
Total real estate investments, net 4,162      
Related debt $ 12,836      
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 1,642      
Land 7,751      
Buildings and Improvements 13,268      
Construction in progress 0      
Total 21,019      
Accumulated Depreciation 6,084      
Total real estate investments, net 14,935      
Related debt $ 0      
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 2,592      
Land 5,739      
Buildings and Improvements 15,214      
Construction in progress 4      
Total 20,957      
Accumulated Depreciation 7,816      
Total real estate investments, net 13,141      
Related debt $ 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 4,588      
Land 703      
Buildings and Improvements 5,130      
Construction in progress 0      
Total 5,833      
Accumulated Depreciation 3,789      
Total real estate investments, net 2,044      
Related debt $ 10,708      
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 22,113      
Buildings and Improvements 4,472      
Construction in progress 0      
Total 26,585      
Accumulated Depreciation 1,602      
Total real estate investments, net 24,983      
Related debt $ 0      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | 1500/1580 Rockville Pike, Rockville, MD        
Real Estate Properties [Line Items]        
Initial Basis $ 35,609      
Cost capitalized subsequent to acquisition 942      
Land 28,323      
Buildings and Improvements 6,274      
Construction in progress 1,954      
Total 36,551      
Accumulated Depreciation 6,151      
Total real estate investments, net 30,400      
Related debt 0      
Shopping Centers | Seabreeze Plaza, Palm Harbor, FL        
Real Estate Properties [Line Items]        
Initial Basis 24,526      
Cost capitalized subsequent to acquisition 3,937      
Land 8,665      
Buildings and Improvements 19,798      
Construction in progress 0      
Total 28,463      
Accumulated Depreciation 9,510      
Total real estate investments, net 18,953      
Related debt $ 12,038      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | Sea Colony (Market Place at), Bethany Beach, DE        
Real Estate Properties [Line Items]        
Initial Basis $ 2,920      
Cost capitalized subsequent to acquisition 399      
Land 1,147      
Buildings and Improvements 2,172      
Construction in progress 0      
Total 3,319      
Accumulated Depreciation 927      
Total real estate investments, net 2,392      
Related debt $ 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 46,798      
Land 4,929      
Buildings and Improvements 46,697      
Construction in progress 20      
Total 51,646      
Accumulated Depreciation 36,517      
Total real estate investments, net 15,129      
Related debt $ 83,979      
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 4,273      
Land 12,700      
Buildings and Improvements 54,726      
Construction in progress 101      
Total 67,527      
Accumulated Depreciation 17,578      
Total real estate investments, net 49,949      
Related debt $ 22,998      
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 11,159      
Land 992      
Buildings and Improvements 12,875      
Construction in progress 0      
Total 13,867      
Accumulated Depreciation 10,096      
Total real estate investments, net 3,771      
Related debt $ 12,495      
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 9,013      
Land 6,402      
Buildings and Improvements 20,430      
Construction in progress 0      
Total 26,832      
Accumulated Depreciation 12,645      
Total real estate investments, net 14,187      
Related debt $ 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 27,633      
Land 15,255      
Buildings and Improvements 30,892      
Construction in progress 381      
Total 46,528      
Accumulated Depreciation 24,795      
Total real estate investments, net 21,733      
Related debt $ 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 12,334      
Land 1,878      
Buildings and Improvements 17,184      
Construction in progress 0      
Total 19,062      
Accumulated Depreciation 14,299      
Total real estate investments, net 4,763      
Related debt $ 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 5,152      
Land 615      
Buildings and Improvements 6,926      
Construction in progress 85      
Total 7,626      
Accumulated Depreciation 5,783      
Total real estate investments, net 1,843      
Related debt $ 0      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | Thruway / Thruway Pad Site Winston-Salem, NC        
Real Estate Properties [Line Items]        
Initial Basis $ 7,848      
Cost capitalized subsequent to acquisition 33,780      
Land 7,692      
Buildings and Improvements 32,418      
Construction in progress 1,518      
Total 41,628      
Accumulated Depreciation 22,283      
Total real estate investments, net 19,345      
Related debt $ 69,810      
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 3,573      
Land 7,851      
Buildings and Improvements 12,184      
Construction in progress 40      
Total 20,075      
Accumulated Depreciation 9,163      
Total real estate investments, net 10,912      
Related debt $ 23,838      
Buildings and improvements depreciable lives in years 40 years      
Shopping Centers | Westview Village / Westview South , Frederick, MD        
Real Estate Properties [Line Items]        
Initial Basis $ 6,047      
Cost capitalized subsequent to acquisition 26,246      
Land 6,047      
Buildings and Improvements 26,246      
Construction in progress 0      
Total 32,293      
Accumulated Depreciation 13,749      
Total real estate investments, net 18,544      
Related debt $ 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 7,551      
Land 4,649      
Buildings and Improvements 8,939      
Construction in progress 240      
Total 13,828      
Accumulated Depreciation 7,064      
Total real estate investments, net 6,764      
Related debt $ 29,338      
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 182      
Construction in progress 0      
Total 182      
Accumulated Depreciation 182      
Total real estate investments, net 0      
Related debt 0      
Mixed-Use Properties        
Real Estate Properties [Line Items]        
Initial Basis 156,294      
Cost capitalized subsequent to acquisition 983,600      
Land 142,374      
Buildings and Improvements 985,785      
Construction in progress 11,735      
Total 1,139,894      
Accumulated Depreciation 266,578      
Total real estate investments, net 873,316      
Related debt 502,900      
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD        
Real Estate Properties [Line Items]        
Initial Basis 21,459      
Cost capitalized subsequent to acquisition 38,478      
Land 3,756      
Buildings and Improvements 56,172      
Construction in progress 9      
Total 59,937      
Accumulated Depreciation 44,773      
Total real estate investments, net 15,164      
Related debt $ 43,858      
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 190,259      
Land 16,287      
Buildings and Improvements 186,325      
Construction in progress 400      
Total 203,012      
Accumulated Depreciation 68,203      
Total real estate investments, net 134,809      
Related debt $ 76,873      
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 92,234      
Land 2,242      
Buildings and Improvements 92,203      
Construction in progress 31      
Total 94,476      
Accumulated Depreciation 22,586      
Total real estate investments, net 71,890      
Related debt $ 58,838      
Buildings and improvements depreciable lives in years 50 years      
Mixed-Use Properties | Twinbrook Quarter Phase 1, Rockville, MD        
Real Estate Properties [Line Items]        
Initial Basis $ 60,260      
Cost capitalized subsequent to acquisition 294,200      
Land 60,260      
Buildings and Improvements 284,536      
Construction in progress 9,664      
Total 354,460      
Accumulated Depreciation 2,126      
Total real estate investments, net 352,334      
Related debt $ 129,625      
Buildings and improvements depreciable lives in years 50 years      
Mixed-Use Properties | The Waycroft, Arlington, VA        
Real Estate Properties [Line Items]        
Initial Basis $ 52,067      
Cost capitalized subsequent to acquisition 228,875      
Land 53,618      
Buildings and Improvements 227,248      
Construction in progress 76      
Total 280,942      
Accumulated Depreciation 32,157      
Total real estate investments, net 248,785      
Related debt $ 145,306      
Buildings and improvements depreciable lives in years 50 years      
Mixed-Use Properties | 601 Pennsylvania Ave., Washington, DC        
Real Estate Properties [Line Items]        
Initial Basis $ 5,479      
Cost capitalized subsequent to acquisition 74,706      
Land 5,667      
Buildings and Improvements 74,240      
Construction in progress 278      
Total 80,185      
Accumulated Depreciation 61,271      
Total real estate investments, net 18,914      
Related debt $ 0      
Buildings and improvements depreciable lives in years 35 years      
Mixed-Use Properties | Washington Square, Alexandria, VA        
Real Estate Properties [Line Items]        
Initial Basis $ 2,034      
Cost capitalized subsequent to acquisition 64,848      
Land 544      
Buildings and Improvements 65,061      
Construction in progress 1,277      
Total 66,882      
Accumulated Depreciation 35,462      
Total real estate investments, net 31,420      
Related debt 48,400      
Development Land        
Real Estate Properties [Line Items]        
Initial Basis 106,524      
Cost capitalized subsequent to acquisition 207,261      
Land 9,283      
Buildings and Improvements 0      
Construction in progress 304,502      
Total 313,785      
Accumulated Depreciation 0      
Total real estate investments, net 313,785      
Development land, related debt 74,006      
Development Land | Ashland Square Phase II, Manassas, VA        
Real Estate Properties [Line Items]        
Initial Basis 5,292      
Cost capitalized subsequent to acquisition 4,056      
Land 7,049      
Buildings and Improvements 0      
Construction in progress 2,299      
Total 9,348      
Accumulated Depreciation 0      
Total real estate investments, net 9,348      
Development land, related debt 0      
Development Land | New Market, New Market, MD        
Real Estate Properties [Line Items]        
Initial Basis 2,088      
Cost capitalized subsequent to acquisition 150      
Land 2,234      
Buildings and Improvements 0      
Construction in progress 4      
Total 2,238      
Accumulated Depreciation 0      
Total real estate investments, net 2,238      
Development land, related debt 0      
Development Land | Hampden House, Bethesda, MD        
Real Estate Properties [Line Items]        
Initial Basis 39,641      
Cost capitalized subsequent to acquisition 177,896      
Land 0      
Buildings and Improvements 0      
Construction in progress 217,537      
Total 217,537      
Accumulated Depreciation 0      
Total real estate investments, net 217,537      
Development land, related debt 74,006      
Development Land | Twinbrook Quarter - Future Phases, Rockville, MD        
Real Estate Properties [Line Items]        
Initial Basis 59,503      
Cost capitalized subsequent to acquisition 25,159      
Land 0      
Buildings and Improvements 0      
Construction in progress 84,662      
Total 84,662      
Accumulated Depreciation 0      
Total real estate investments, net 84,662      
Development land, related debt $ 0