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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Additional Information) (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
shopping_center
note
Dec. 31, 2017
USD ($)
Sep. 01, 2017
USD ($)
Dec. 31, 2012
USD ($)
Notes Payable [Line Items]        
Interest rate 4.40% 3.90%    
Fixed rate mortgages $ 880,271,000 $ 897,888,000    
Fixed rate mortgage notes payable        
Notes Payable [Line Items]        
Interest rate 5.18%      
Fixed rate mortgages $ 910,189,000 890,393,000    
Fixed rate mortgage notes payable | 5.88% due January 2019        
Notes Payable [Line Items]        
Interest rate 5.88%      
Fixed rate mortgages $ 0 30,201,000    
Fixed rate mortgage notes payable | 5.88% due January 2019 | Broadlands Village, The Glen and Kentlands Square I        
Notes Payable [Line Items]        
Number of shopping centers | shopping_center 3      
Principal and interest payments $ 306,000      
Balloon payment to be paid $ 28,400,000      
Amortization period 25 years      
Number of notes | note 2      
Fixed rate mortgage notes payable | 5.76% due May 2019        
Notes Payable [Line Items]        
Interest rate 5.76%      
Fixed rate mortgages $ 9,159,000 9,783,000    
Fixed rate mortgage notes payable | 5.76% due May 2019 | Olde Forte Village        
Notes Payable [Line Items]        
Principal and interest payments 98,000      
Balloon payment to be paid $ 9,000,000      
Amortization period 25 years      
Amortization of principal $ 624,100      
Fixed rate mortgage notes payable | 5.62% due July 2019        
Notes Payable [Line Items]        
Interest rate 5.62%      
Fixed rate mortgages $ 12,676,000 13,529,000    
Fixed rate mortgage notes payable | 5.62% due July 2019 | Countryside        
Notes Payable [Line Items]        
Principal and interest payments 133,000      
Balloon payment to be paid $ 12,300,000      
Amortization period 25 years      
Amortization of principal $ 853,100      
Fixed rate mortgage notes payable | 5.79% due September 2019        
Notes Payable [Line Items]        
Interest rate 5.79%      
Fixed rate mortgages $ 12,714,000 13,543,000    
Fixed rate mortgage notes payable | 5.79% due September 2019 | Briggs Chancy MarketPlace        
Notes Payable [Line Items]        
Principal and interest payments 133,000      
Balloon payment to be paid $ 12,200,000      
Amortization period 25 years      
Amortization of principal $ 829,100      
Fixed rate mortgage notes payable | 5.22% due January 2020        
Notes Payable [Line Items]        
Interest rate 5.22%      
Fixed rate mortgages $ 11,295,000 12,029,000    
Fixed rate mortgage notes payable | 5.22% due January 2020 | Shops at Monocacy        
Notes Payable [Line Items]        
Principal and interest payments 112,000      
Balloon payment to be paid $ 10,600,000      
Amortization period 25 years      
Amortization of principal $ 733,800      
Fixed rate mortgage notes payable | 5.60% due May 2020        
Notes Payable [Line Items]        
Interest rate 5.60%      
Fixed rate mortgages $ 9,601,000 9,948,000    
Fixed rate mortgage notes payable | 5.60% due May 2020 | Boca Valley Plaza        
Notes Payable [Line Items]        
Principal and interest payments 75,000      
Balloon payment to be paid $ 9,100,000      
Amortization period 30 years      
Amortization of principal $ 347,300      
Fixed rate mortgage notes payable | 5.30% due June 2020        
Notes Payable [Line Items]        
Interest rate 5.30%      
Fixed rate mortgages $ 7,766,000 8,244,000    
Fixed rate mortgage notes payable | 5.30% due June 2020 | Palm Springs Center        
Notes Payable [Line Items]        
Principal and interest payments 75,000      
Balloon payment to be paid $ 7,100,000      
Amortization period 25 years      
Amortization of principal $ 477,900      
Fixed rate mortgage notes payable | 5.83% due July 2020        
Notes Payable [Line Items]        
Interest rate 5.83%      
Fixed rate mortgages $ 36,711,000 37,998,000    
Fixed rate mortgage notes payable | 5.83% due July 2020 | Thruway        
Notes Payable [Line Items]        
Principal and interest payments 289,000      
Balloon payment to be paid $ 34,800,000      
Amortization period 25 years      
Amortization of principal $ 1,300,000      
Fixed rate mortgage notes payable | 5.81% due February 2021        
Notes Payable [Line Items]        
Interest rate 5.81%      
Fixed rate mortgages $ 6,943,000 7,325,000    
Fixed rate mortgage notes payable | 5.81% due February 2021 | Jamestown Place        
Notes Payable [Line Items]        
Principal and interest payments 66,000      
Balloon payment to be paid $ 6,100,000      
Amortization period 25 years      
Amortization of principal $ 381,700      
Fixed rate mortgage notes payable | 6.01% due August 2021        
Notes Payable [Line Items]        
Interest rate 6.01%      
Fixed rate mortgages $ 5,480,000 5,649,000    
Fixed rate mortgage notes payable | 6.01% due August 2021 | Hunt Club Corners        
Notes Payable [Line Items]        
Principal and interest payments 42,000      
Balloon payment to be paid $ 5,000,000      
Amortization period 30 years      
Amortization of principal $ 169,300      
Fixed rate mortgage notes payable | 5.62% due June 2022        
Notes Payable [Line Items]        
Interest rate 5.62%      
Fixed rate mortgages $ 31,723,000 32,673,000    
Fixed rate mortgage notes payable | 5.62% due June 2022 | Landsowne Town Center        
Notes Payable [Line Items]        
Principal and interest payments 230,000      
Balloon payment to be paid $ 28,200,000      
Amortization period 30 years      
Amortization of principal $ 949,600      
Fixed rate mortgage notes payable | 6.08% due September 2022        
Notes Payable [Line Items]        
Interest rate 6.08%      
Fixed rate mortgages $ 9,728,000 9,999,000    
Fixed rate mortgage notes payable | 6.08% due September 2022 | Orchard Park        
Notes Payable [Line Items]        
Principal and interest payments 73,000      
Balloon payment to be paid $ 8,600,000      
Amortization period 30 years      
Amortization of principal $ 270,300      
Fixed rate mortgage notes payable | 6.43% due April 2023        
Notes Payable [Line Items]        
Interest rate 6.43%      
Fixed rate mortgages $ 10,609,000 10,877,000    
Fixed rate mortgage notes payable | 6.43% due April 2023 | BJs Wholesale        
Notes Payable [Line Items]        
Principal and interest payments 80,000      
Balloon payment to be paid $ 9,300,000      
Amortization period 30 years      
Amortization of principal $ 268,400      
Fixed rate mortgage notes payable | 6.28% due February 2024        
Notes Payable [Line Items]        
Interest rate 6.28%      
Fixed rate mortgages $ 11,702,000 12,577,000    
Fixed rate mortgage notes payable | 6.28% due February 2024 | Great Falls Shopping Center        
Notes Payable [Line Items]        
Principal and interest payments 138,000      
Balloon payment to be paid $ 6,300,000      
Amortization period 26 years      
Amortization of principal $ 874,800      
Number of notes | note 3      
Fixed rate mortgage notes payable | 7.35% due June 2024        
Notes Payable [Line Items]        
Interest rate 7.35%      
Fixed rate mortgages $ 14,952,000 15,452,000    
Fixed rate mortgage notes payable | 7.35% due June 2024 | Leesburg Pike        
Notes Payable [Line Items]        
Principal and interest payments 135,000      
Balloon payment to be paid $ 11,500,000      
Amortization period 25 years      
Amortization of principal $ 499,800      
Fixed rate mortgage notes payable | 7.60% due June 2024        
Notes Payable [Line Items]        
Interest rate 7.60%      
Fixed rate mortgages $ 13,013,000 13,438,000    
Fixed rate mortgage notes payable | 7.60% due June 2024 | Village Center        
Notes Payable [Line Items]        
Principal and interest payments 119,000      
Balloon payment to be paid $ 10,100,000      
Amortization period 25 years      
Amortization of principal $ 424,700      
Fixed rate mortgage notes payable | 7.02% due July 2024        
Notes Payable [Line Items]        
Interest rate 7.02%      
Fixed rate mortgages $ 23,198,000 23,873,000    
Fixed rate mortgage notes payable | 7.02% due July 2024 | White Oak Shopping Center        
Notes Payable [Line Items]        
Principal and interest payments 193,000      
Balloon payment to be paid $ 18,500,000      
Amortization period 24 years 4 months 24 days      
Loan amount       $ 10,500,000
Amortization of principal $ 675,200      
Fixed rate mortgage notes payable | 7.45% due July 2024        
Notes Payable [Line Items]        
Interest rate 7.45%      
Fixed rate mortgages $ 27,222,000 28,115,000    
Fixed rate mortgage notes payable | 7.45% due July 2024 | Avenel Business Park        
Notes Payable [Line Items]        
Principal and interest payments 246,000      
Balloon payment to be paid $ 20,900,000      
Amortization period 25 years      
Amortization of principal $ 893,200      
Fixed rate mortgage notes payable | 7.30% due January 2025        
Notes Payable [Line Items]        
Interest rate 7.30%      
Fixed rate mortgages $ 27,168,000 28,025,000    
Fixed rate mortgage notes payable | 7.30% due January 2025 | Ashburn Village        
Notes Payable [Line Items]        
Principal and interest payments 240,000      
Balloon payment to be paid $ 20,500,000      
Amortization period 25 years      
Amortization of principal $ 858,000      
Fixed rate mortgage notes payable | 6.18% due January 2026        
Notes Payable [Line Items]        
Interest rate 6.18%      
Fixed rate mortgages $ 14,086,000 14,537,000    
Fixed rate mortgage notes payable | 6.18% due January 2026 | Ravenwood        
Notes Payable [Line Items]        
Principal and interest payments 111,000      
Balloon payment to be paid $ 10,100,000      
Amortization period 25 years      
Amortization of principal $ 451,200      
Fixed rate mortgage notes payable | 5.31% due April 2026        
Notes Payable [Line Items]        
Interest rate 5.31%      
Fixed rate mortgages $ 102,310,000 105,817,000    
Fixed rate mortgage notes payable | 5.31% due April 2026 | Clarendon Center        
Notes Payable [Line Items]        
Principal and interest payments 753,000      
Balloon payment to be paid $ 70,500,000      
Amortization period 25 years      
Amortization of principal $ 3,500,000      
Fixed rate mortgage notes payable | 4.30% due October 2026        
Notes Payable [Line Items]        
Interest rate 4.30%      
Fixed rate mortgages $ 30,888,000 32,016,000    
Fixed rate mortgage notes payable | 4.30% due October 2026 | Severna Park Market Place        
Notes Payable [Line Items]        
Principal and interest payments 207,000      
Balloon payment to be paid $ 20,300,000      
Amortization period 25 years      
Amortization of principal $ 1,100,000      
Fixed rate mortgage notes payable | 4.53% due November 2026        
Notes Payable [Line Items]        
Interest rate 4.53%      
Fixed rate mortgages $ 35,258,000 36,507,000    
Fixed rate mortgage notes payable | 4.53% due November 2026 | Kentlands Square II        
Notes Payable [Line Items]        
Principal and interest payments 240,000      
Balloon payment to be paid $ 23,100,000      
Amortization period 25 years      
Amortization of principal $ 1,200,000      
Fixed rate mortgage notes payable | 4.70% due December 2026        
Notes Payable [Line Items]        
Interest rate 4.70%      
Fixed rate mortgages $ 16,515,000 17,086,000    
Fixed rate mortgage notes payable | 4.70% due December 2026 | Cranberry Square        
Notes Payable [Line Items]        
Principal and interest payments 113,000      
Balloon payment to be paid $ 10,900,000      
Amortization period 25 years      
Amortization of principal $ 570,500      
Fixed rate mortgage notes payable | 5.84% due May 2027        
Notes Payable [Line Items]        
Interest rate 5.84%      
Fixed rate mortgages $ 62,630,000 64,472,000    
Fixed rate mortgage notes payable | 5.84% due May 2027 | Seven Corners        
Notes Payable [Line Items]        
Principal and interest payments 463,200      
Balloon payment to be paid $ 42,300,000      
Amortization period 25 years      
Loan amount $ 73,000,000      
Amortization of principal $ 1,800,000      
Fixed rate mortgage notes payable | 4.04% due April 2028        
Notes Payable [Line Items]        
Interest rate 4.04%      
Fixed rate mortgages $ 15,345,000 15,859,000    
Fixed rate mortgage notes payable | 4.04% due April 2028 | Hampshire Langley        
Notes Payable [Line Items]        
Principal and interest payments 95,400      
Balloon payment to be paid $ 9,500,000      
Amortization period 25 years      
Amortization of principal $ 513,700      
Fixed rate mortgage notes payable | 3.51% due June 2028        
Notes Payable [Line Items]        
Interest rate 3.51%      
Fixed rate mortgages $ 38,120,000 39,968,000    
Fixed rate mortgage notes payable | 3.51% due June 2028 | Beacon Center        
Notes Payable [Line Items]        
Balloon payment to be paid $ 17,100,000      
Amortization period 20 years      
Amortization of principal $ 1,800,000      
Fixed rate mortgage notes payable | 3.99% due September 2028        
Notes Payable [Line Items]        
Interest rate 3.99%      
Fixed rate mortgages $ 15,547,000 16,055,000    
Fixed rate mortgage notes payable | 3.99% due September 2028 | Seabreeze Plaza        
Notes Payable [Line Items]        
Principal and interest payments 94,900      
Balloon payment to be paid $ 9,500,000      
Amortization period 25 years      
Amortization of principal $ 507,600      
Fixed rate mortgage notes payable | 3.69% Due March 2030        
Notes Payable [Line Items]        
Interest rate 3.69%      
Fixed rate mortgages $ 27,060,000 27,884,000    
Fixed rate mortgage notes payable | 3.69% Due March 2030 | Shops at Fairfax and Boulevard        
Notes Payable [Line Items]        
Principal and interest payments 153,300      
Balloon payment to be paid $ 15,500,000      
Amortization period 25 years      
Amortization of principal $ 824,000      
Fixed rate mortgage notes payable | 3.99% Due April 2030        
Notes Payable [Line Items]        
Interest rate 3.99%      
Fixed rate mortgages $ 14,526,000 14,950,000    
Fixed rate mortgage notes payable | 3.99% Due April 2030 | Northrock        
Notes Payable [Line Items]        
Principal and interest payments 84,400      
Balloon payment to be paid $ 8,400,000      
Amortization period 25 years      
Amortization of principal $ 423,600      
Fixed rate mortgage notes payable | 3.39% due January 2032        
Notes Payable [Line Items]        
Interest rate 3.39%      
Fixed rate mortgages $ 38,076,000 39,140,000    
Fixed rate mortgage notes payable | 3.39% due January 2032 | Burtonsville Town Square        
Notes Payable [Line Items]        
Principal and interest payments 197,900      
Balloon payment to be paid $ 20,300,000      
Amortization period 25 years      
Amortization of principal $ 1,100,000      
Fixed rate mortgage notes payable | 4.88% due September 2032        
Notes Payable [Line Items]        
Interest rate 4.88%      
Fixed rate mortgages $ 69,691,000 71,211,000    
Fixed rate mortgage notes payable | 4.88% due September 2032 | Park Van Ness        
Notes Payable [Line Items]        
Principal and interest payments 413,500      
Balloon payment to be paid $ 39,600,000      
Amortization period 25 years      
Amortization of principal $ 1,500,000      
Fixed rate mortgages     $ 71,580,000  
Fixed rate mortgage notes payable | 3.75% due December 2032        
Notes Payable [Line Items]        
Interest rate 3.75%      
Fixed rate mortgages $ 58,523,000 60,000,000    
Fixed rate mortgage notes payable | 3.75% due December 2032 | Washington Square        
Notes Payable [Line Items]        
Principal and interest payments 308,500      
Balloon payment to be paid $ 31,100,000      
Amortization period 25 years      
Amortization of principal $ 1,500,000      
Fixed rate mortgage notes payable | 4.41% mortgage maturing 2033        
Notes Payable [Line Items]        
Interest rate 4.41%      
Fixed rate mortgages $ 31,941,000 0    
Fixed rate mortgage notes payable | 4.41% mortgage maturing 2033 | Broadlands Village        
Notes Payable [Line Items]        
Principal and interest payments 176,200      
Balloon payment to be paid $ 17,300,000      
Amortization period 25 years      
Amortization of principal $ 58,600      
Fixed rate mortgage notes payable | 4.69% fixed rate loan maturing in 2034        
Notes Payable [Line Items]        
Interest rate 4.69%      
Fixed rate mortgages $ 22,900,000 0    
Fixed rate mortgage notes payable | 4.69% fixed rate loan maturing in 2034 | The Glen        
Notes Payable [Line Items]        
Principal and interest payments 129,800      
Balloon payment to be paid $ 12,500,000      
Amortization period 25 years      
Fixed rate mortgage notes payable | 8.00% due April 2034        
Notes Payable [Line Items]        
Interest rate 8.00%      
Fixed rate mortgages $ 11,781,000 11,613,000    
Fixed rate mortgage notes payable | 8.00% due April 2034 | Olney        
Notes Payable [Line Items]        
Principal and interest payments 60,400      
Balloon payment to be paid $ 14,700,000      
Fixed rate increase on note 1.50%      
Interest rate 8.00%      
Negative amortization $ (168,600)      
Fixed rate mortgage notes payable | 4.67% Construction To Permanent Loan Due 2035        
Notes Payable [Line Items]        
Interest rate 4.67%      
Fixed rate mortgages $ 23,332,000 $ 0    
Fixed rate mortgage notes payable | 4.67% Construction To Permanent Loan Due 2035 | Glebe Road        
Notes Payable [Line Items]        
Principal and interest payments $ 887,900      
Amortization period 25 years      
Fixed rate mortgages     $ 157,000,000  
Variable rate loans payable        
Notes Payable [Line Items]        
Interest rate spread on LIBOR 3.84%      
Variable rate loans payable | Metro Pike Center Bank Loan        
Notes Payable [Line Items]        
Interest rate spread on LIBOR 1.65%      
Variable rate loans payable | Metro Pike Center Bank Loan | Metro Pike Center        
Notes Payable [Line Items]        
Principal and interest payments $ 48,000      
Balloon payment to be paid 14,200,000      
New Facility | Line of Credit        
Notes Payable [Line Items]        
Line of credit facility, maximum borrowing capacity 400,000,000      
Revolving Credit Facility | New Facility | Line of Credit        
Notes Payable [Line Items]        
Line of credit facility, maximum borrowing capacity $ 325,000,000      
Debt maturity extension period 1 year      
Debt instrument fee 0.15%      
Interest rate spread on LIBOR 1.35%      
Term Facility | New Facility | Line of Credit        
Notes Payable [Line Items]        
Line of credit facility, maximum borrowing capacity $ 75,000,000      
Interest rate spread on LIBOR 1.30%