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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
Feb. 27, 2013
Dec. 31, 2016
USD ($)
shopping_center
note
Dec. 31, 2015
Dec. 31, 2012
USD ($)
Notes Payable [Line Items]        
Interest rate   4.25% 3.75%  
Line of credit facility, maximum borrowing capacity   $ 225,600,000    
Northrock        
Notes Payable [Line Items]        
Interest rate spread on LIBOR 1.65%      
Metro Pike Center        
Notes Payable [Line Items]        
Interest rate spread on LIBOR 1.65%      
Fixed rate mortgage notes payable        
Notes Payable [Line Items]        
Interest rate [1]   5.48%    
Fixed rate mortgage notes payable | 6.01% due February 2018        
Notes Payable [Line Items]        
Interest rate [1]   6.01%    
Fixed rate mortgage notes payable | 6.01% due February 2018 | Washington Square        
Notes Payable [Line Items]        
Principal and interest payments   $ 264,000    
Amortization period   27 years 6 months    
Debt instrument final payment   $ 28,000,000    
Amortization of principal   $ 1,400,000    
Fixed rate mortgage notes payable | 5.88% due January 2019        
Notes Payable [Line Items]        
Interest rate [1]   5.88%    
Fixed rate mortgage notes payable | 5.88% due January 2019 | Broadlands Village, The Glen and Kentlands Square I        
Notes Payable [Line Items]        
Principal and interest payments   $ 306,000    
Amortization period   25 years    
Debt instrument final payment   $ 28,400,000    
Amortization of principal   $ 1,700,000    
Number of shopping centers | shopping_center   3    
Fixed rate mortgage notes payable | 5.76% due May 2019        
Notes Payable [Line Items]        
Interest rate [1]   5.76%    
Fixed rate mortgage notes payable | 5.76% due May 2019 | Olde Forte Village        
Notes Payable [Line Items]        
Principal and interest payments   $ 98,000    
Amortization period   25 years    
Debt instrument final payment   $ 9,000,000    
Amortization of principal   $ 556,000    
Fixed rate mortgage notes payable | 5.62% due July 2019        
Notes Payable [Line Items]        
Interest rate [1]   5.62%    
Fixed rate mortgage notes payable | 5.62% due July 2019 | Countryside        
Notes Payable [Line Items]        
Principal and interest payments   $ 133,000    
Amortization period   25 years    
Debt instrument final payment   $ 12,300,000    
Amortization of principal   $ 763,000    
Fixed rate mortgage notes payable | 5.79% due September 2019        
Notes Payable [Line Items]        
Interest rate [1]   5.79%    
Fixed rate mortgage notes payable | 5.79% due September 2019 | Briggs Chancy MarketPlace        
Notes Payable [Line Items]        
Principal and interest payments   $ 133,000    
Amortization period   25 years    
Debt instrument final payment   $ 12,200,000    
Amortization of principal   $ 739,000    
Fixed rate mortgage notes payable | 5.22% due January 2020        
Notes Payable [Line Items]        
Interest rate [1]   5.22%    
Fixed rate mortgage notes payable | 5.22% due January 2020 | Shops at Monocacy        
Notes Payable [Line Items]        
Principal and interest payments   $ 112,000    
Amortization period   25 years    
Debt instrument final payment   $ 10,600,000    
Amortization of principal   $ 662,000    
Fixed rate mortgage notes payable | 5.60% due May 2020        
Notes Payable [Line Items]        
Interest rate [1]   5.60%    
Fixed rate mortgage notes payable | 5.60% due May 2020 | Boca Valley Plaza        
Notes Payable [Line Items]        
Principal and interest payments   $ 75,000    
Amortization period   30 years    
Debt instrument final payment   $ 9,100,000    
Amortization of principal   $ 310,000    
Fixed rate mortgage notes payable | 5.30% due June 2020        
Notes Payable [Line Items]        
Interest rate [1]   5.30%    
Fixed rate mortgage notes payable | 5.30% due June 2020 | Palm Springs Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 75,000    
Amortization period   25 years    
Debt instrument final payment   $ 7,100,000    
Amortization of principal   $ 430,000    
Fixed rate mortgage notes payable | 5.83% due July 2020        
Notes Payable [Line Items]        
Interest rate [1]   5.83%    
Fixed rate mortgage notes payable | 5.83% due July 2020 | Thruway        
Notes Payable [Line Items]        
Principal and interest payments   $ 289,000    
Amortization period   25 years    
Debt instrument final payment   $ 34,800,000    
Amortization of principal   $ 1,147,000    
Fixed rate mortgage notes payable | 5.81% due February 2021        
Notes Payable [Line Items]        
Interest rate [1]   5.81%    
Fixed rate mortgage notes payable | 5.81% due February 2021 | Jamestown Place        
Notes Payable [Line Items]        
Principal and interest payments   $ 66,000    
Amortization period   25 years    
Debt instrument final payment   $ 6,100,000    
Amortization of principal   $ 340,000    
Fixed rate mortgage notes payable | 6.01% due August 2021        
Notes Payable [Line Items]        
Interest rate [1]   6.01%    
Fixed rate mortgage notes payable | 6.01% due August 2021 | Hunt Club Corners        
Notes Payable [Line Items]        
Principal and interest payments   $ 42,000    
Amortization period   30 years    
Debt instrument final payment   $ 5,000,000    
Amortization of principal   $ 151,000    
Fixed rate mortgage notes payable | 5.62% due June 2022        
Notes Payable [Line Items]        
Interest rate [1]   5.62%    
Fixed rate mortgage notes payable | 5.62% due June 2022 | Landsowne Town Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 230,000    
Amortization period   30 years    
Debt instrument final payment   $ 28,200,000    
Amortization of principal   $ 849,000    
Fixed rate mortgage notes payable | 6.08% due September 2022        
Notes Payable [Line Items]        
Interest rate [1]   6.08%    
Fixed rate mortgage notes payable | 6.08% due September 2022 | Orchard Park        
Notes Payable [Line Items]        
Principal and interest payments   $ 73,000    
Amortization period   30 years    
Debt instrument final payment   $ 8,600,000    
Amortization of principal   $ 239,000    
Fixed rate mortgage notes payable | 6.43% due April 2023        
Notes Payable [Line Items]        
Interest rate [1]   6.43%    
Fixed rate mortgage notes payable | 6.43% due April 2023 | BJs Wholesale        
Notes Payable [Line Items]        
Principal and interest payments   $ 80,000    
Amortization period   30 years    
Debt instrument final payment   $ 9,300,000    
Amortization of principal   $ 236,000    
Fixed rate mortgage notes payable | 6.28% due February 2024        
Notes Payable [Line Items]        
Interest rate [1]   6.28%    
Fixed rate mortgage notes payable | 6.28% due February 2024 | Great Falls Shopping Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 138,000    
Amortization period   26 years    
Debt instrument final payment   $ 6,300,000    
Amortization of principal   $ 776,000    
Number of notes | note   3    
Fixed rate mortgage notes payable | 7.35% due June 2024        
Notes Payable [Line Items]        
Interest rate [1]   7.35%    
Fixed rate mortgage notes payable | 7.35% due June 2024 | Leesburg Pike        
Notes Payable [Line Items]        
Principal and interest payments   $ 135,000    
Amortization period   25 years    
Debt instrument final payment   $ 11,500,000    
Amortization of principal   $ 431,000    
Fixed rate mortgage notes payable | 7.60% due June 2024        
Notes Payable [Line Items]        
Interest rate [1]   7.60%    
Fixed rate mortgage notes payable | 7.60% due June 2024 | Village Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 119,000    
Amortization period   25 years    
Debt instrument final payment   $ 10,100,000    
Amortization of principal   $ 365,000    
Fixed rate mortgage notes payable | 7.02% due July 2024        
Notes Payable [Line Items]        
Interest rate [1]   7.02%    
Fixed rate mortgage notes payable | 7.02% due July 2024 | White Oak Shopping Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 193,000    
Amortization period   24 years 4 months 24 days    
Debt instrument final payment   $ 18,500,000    
Loan amount       $ 10,500,000
Amortization of principal   $ 584,000    
Fixed rate mortgage notes payable | 7.45% due July 2024        
Notes Payable [Line Items]        
Interest rate [1]   7.45%    
Fixed rate mortgage notes payable | 7.45% due July 2024 | Avenel Business Park        
Notes Payable [Line Items]        
Principal and interest payments   $ 246,000    
Amortization period   25 years    
Debt instrument final payment   $ 20,900,000    
Amortization of principal   $ 769,000    
Fixed rate mortgage notes payable | 7.30% due January 2025        
Notes Payable [Line Items]        
Interest rate [1]   7.30%    
Fixed rate mortgage notes payable | 7.30% due January 2025 | Ashburn Village        
Notes Payable [Line Items]        
Principal and interest payments   $ 240,000    
Amortization period   25 years    
Debt instrument final payment   $ 20,500,000    
Amortization of principal   $ 742,000    
Fixed rate mortgage notes payable | 6.18% due January 2026        
Notes Payable [Line Items]        
Interest rate [1]   6.18%    
Fixed rate mortgage notes payable | 6.18% due January 2026 | Ravenwood        
Notes Payable [Line Items]        
Principal and interest payments   $ 111,000    
Amortization period   25 years    
Debt instrument final payment   $ 10,100,000    
Amortization of principal   $ 399,000    
Fixed rate mortgage notes payable | 5.31% due April 2026        
Notes Payable [Line Items]        
Interest rate [1]   5.31%    
Fixed rate mortgage notes payable | 5.31% due April 2026 | Clarendon Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 753,000    
Amortization period   25 years    
Debt instrument final payment   $ 70,500,000    
Amortization of principal   $ 3,200,000    
Fixed rate mortgage notes payable | 4.30% due October 2026        
Notes Payable [Line Items]        
Interest rate [1]   4.30%    
Fixed rate mortgage notes payable | 4.30% due October 2026 | Severna Park Market Place        
Notes Payable [Line Items]        
Principal and interest payments   $ 207,000    
Amortization period   25 years    
Debt instrument final payment   $ 20,300,000    
Amortization of principal   $ 1,036,000    
Fixed rate mortgage notes payable | 4.53% due November 2026        
Notes Payable [Line Items]        
Interest rate [1]   4.53%    
Fixed rate mortgage notes payable | 4.53% due November 2026 | Kentlands Square II        
Notes Payable [Line Items]        
Principal and interest payments   $ 240,000    
Amortization period   25 years    
Debt instrument final payment   $ 23,100,000    
Amortization of principal   $ 1,141,000    
Fixed rate mortgage notes payable | 4.70% due December 2026        
Notes Payable [Line Items]        
Interest rate [1]   4.70%    
Fixed rate mortgage notes payable | 4.70% due December 2026 | Cranberry Square        
Notes Payable [Line Items]        
Principal and interest payments   $ 113,000    
Amortization period   25 years    
Debt instrument final payment   $ 10,900,000    
Amortization of principal   $ 520,000    
Fixed rate mortgage notes payable | 5.84% due May 2027        
Notes Payable [Line Items]        
Interest rate [1]   5.84%    
Fixed rate mortgage notes payable | 5.84% due May 2027 | Seven Corners        
Notes Payable [Line Items]        
Principal and interest payments   $ 463,200    
Amortization period   25 years    
Debt instrument final payment   $ 42,300,000    
Loan amount   73,000,000    
Amortization of principal   $ 1,600,000    
Fixed rate mortgage notes payable | 4.04% due April 2028        
Notes Payable [Line Items]        
Interest rate [1]   4.04%    
Fixed rate mortgage notes payable | 4.04% due April 2028 | Hampshire Langley        
Notes Payable [Line Items]        
Principal and interest payments   $ 95,400    
Amortization period   25 years    
Debt instrument final payment   $ 9,500,000    
Amortization of principal   $ 474,000    
Fixed rate mortgage notes payable | 3.51% due June 2028        
Notes Payable [Line Items]        
Interest rate [1]   3.51%    
Fixed rate mortgage notes payable | 3.51% due June 2028 | Beacon Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 268,500    
Amortization period   20 years    
Debt instrument final payment   $ 17,100,000    
Amortization of principal   $ 1,300,000    
Fixed rate mortgage notes payable | 3.99% due September 2028        
Notes Payable [Line Items]        
Interest rate [1]   3.99%    
Fixed rate mortgage notes payable | 3.99% due September 2028 | Seabreeze Plaza        
Notes Payable [Line Items]        
Principal and interest payments   $ 94,900    
Amortization period   25 years    
Debt instrument final payment   $ 9,500,000    
Amortization of principal   $ 468,000    
Fixed rate mortgage notes payable | 3.69% Due March 2030        
Notes Payable [Line Items]        
Interest rate [1]   3.69%    
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    
Amortization period   25 years    
Debt instrument final payment   $ 15,500,000    
Amortization of principal   $ 765,000    
Fixed rate mortgage notes payable | 3.99% Due April 2030        
Notes Payable [Line Items]        
Interest rate [1]   3.99%    
Fixed rate mortgage notes payable | 3.99% Due April 2030 | Northrock        
Notes Payable [Line Items]        
Principal and interest payments   $ 84,400    
Amortization period   25 years    
Debt instrument final payment   $ 8,400,000    
Amortization of principal   $ 391,000    
Fixed rate mortgage notes payable | 4.88% due September 2032        
Notes Payable [Line Items]        
Interest rate [1]   4.88%    
Fixed rate mortgage notes payable | 4.88% due September 2032 | Park Van Ness        
Notes Payable [Line Items]        
Principal and interest payments   $ 413,500    
Amortization period   25 years    
Debt instrument final payment   $ 39,600,000    
Loan amount   $ 71,600,000    
Fixed rate mortgage notes payable | 8.00% due April 2034        
Notes Payable [Line Items]        
Interest rate [1]   8.00%    
Fixed rate mortgage notes payable | 8.00% due April 2034 | Olney        
Notes Payable [Line Items]        
Principal and interest payments   $ 60,400    
Debt instrument final payment   $ 14,700,000    
Fixed rate increase on note   1.50%    
Interest rate   8.00%    
Negative amortization   $ 164,000    
Variable rate loans payable        
Notes Payable [Line Items]        
Interest rate spread on LIBOR [1]   2.22%    
Variable rate loans payable | Revolving credit facility        
Notes Payable [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 275,000,000    
Debt maturity extension period   1 year    
Debt instrument fee   0.15%    
Interest rate spread on LIBOR [1]   1.45%    
Variable rate loans payable | Metro Pike Center Bank Loan        
Notes Payable [Line Items]        
Interest rate spread on LIBOR [1]   1.65%    
Variable rate loans payable | Metro Pike Center Bank Loan | Metro Pike Center        
Notes Payable [Line Items]        
Principal and interest payments   $ 48,000    
Debt instrument final payment   14,200,000    
Amortization of principal   $ 319,000    
[1] Interest rate and scheduled maturity data presented as of December 31, 2016. Totals computed using weighted averages. Amounts shown are principal amounts and have not been reduced by any deferred debt issuance costs.