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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Parenthetical) (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 Metro Pike Center | Dec. 31, 2013 White Oak Shopping Center | Dec. 31, 2013 Beacon Center | Dec. 31, 2013 Northrock | Dec. 31, 2012 7.67% due October 2012 Metro Pike Center | Dec. 31, 2012 6.12% due January 2013 Cruse Market Place | Dec. 31, 2012 7.88% due January 2013 Seabreeze Plaza | Dec. 31, 2013 7.45% due June 2015 Shops at Fairfax and Boulevard | Dec. 31, 2013 6.01% due February 2018 Washington Square | Dec. 31, 2013 5.88% due January 2019 Broadlands Village, The Glen and Kentlands Square I Store | Dec. 31, 2013 5.76% due May 2019 Olde Forte Village | Dec. 31, 2013 5.62% due July 2019 Countryside | Dec. 31, 2013 5.79% due September 2019 Briggs Chancy MarketPlace | Dec. 31, 2013 5.22% due January 2020 Shops at Monocacy | Dec. 31, 2013 5.60% due May 2020 Boca Valley Plaza | Dec. 31, 2013 5.30% due June 2020 Palm Springs Center | Dec. 31, 2013 5.83% due July 2020 Thruway | Dec. 31, 2013 5.81% due February 2021 Jamestown Place | Dec. 31, 2013 6.01% due August 2021 Hunt Club Corners | Dec. 31, 2013 5.62% due June 2022 Landsowne Town Center | Dec. 31, 2013 6.08% due September 2022 Orchard Park | Dec. 31, 2013 6.43% due April 2023 BJs Wholesale | Dec. 31, 2013 6.28% due February 2024 Great Falls Shopping Center Note | Dec. 31, 2013 7.35% due June 2024 Leesburg Pike | Dec. 31, 2013 7.60% due June 2024 Village Center | Dec. 31, 2013 7.02% due July 2024 White Oak Shopping Center | Dec. 31, 2013 7.45% due July 2024 Avenel Business Park | Dec. 31, 2013 7.30% due January 2025 Ashburn Village | Dec. 31, 2013 6.18% due January 2026 Ravenwood | Dec. 31, 2013 5.31% due April 2026 Clarendon Center | Sep. 23, 2011 4.30% due October2026 Severna Park Market Place | Dec. 31, 2013 4.30% due October2026 Severna Park Market Place | Dec. 31, 2013 4.53% due November 2026 Kentlands Square II | Dec. 31, 2013 4.70% due December 2026 Cranberry Square | Dec. 31, 2013 5.84% due May 2027 Seven Corners | Dec. 31, 2013 4.04% due April 2028 Hampshire Langley | Dec. 31, 2013 3.51% due June 2028 Beacon Center | Dec. 31, 2013 3.99% due September 2028 Seabreeze Plaza | Oct. 25, 2013 4.88% due September 2032 Park Van Ness | Dec. 31, 2013 4.88% due September 2032 Park Van Ness | Dec. 31, 2013 Revolving credit facility | Dec. 31, 2013 Revolving credit facility One-month LIBOR | Dec. 31, 2013 Northrock loan Northrock
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and interest payments | $ 48,000 |  |  |  | $ 86,000 | $ 56,000 | $ 102,000 | $ 156,000 | $ 264,000 | $ 306,000 | $ 98,000 | $ 133,000 | $ 133,000 | $ 112,000 | $ 75,000 | $ 75,000 | $ 289,000 | $ 66,000 | $ 42,000 | $ 230,000 | $ 73,000 | $ 80,000 | $ 138,000 | $ 135,000 | $ 119,000 | $ 193,000 | $ 246,000 | $ 240,000 | $ 111,000 | $ 753,000 |  | $ 207,000 | $ 240,000 | $ 113,000 | $ 463,200 | $ 95,400 | $ 203,200 | $ 94,900 |  | $ 413,500 |  |  | $ 47,000
Amortization period | 25 years | 25 years | 20 years | 25 years | 25 years | 24 years | 26 years | 23 years | 27 years 6 months | 25 years | 25 years | 25 years | 25 years | 25 years | 30 years | 25 years | 25 years | 25 years | 30 years | 30 years | 30 years | 30 years | 26 years | 25 years | 25 years | 24 years 4 months 24 days | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 20 years | 25 years | 25 years | 25 years |  |  |
Debt instrument final payment | 14,800,000 | 18,500,000 |  | 14,200,000 | 15,600,000 | 6,800,000 | 13,300,000 | 15,200,000 | 28,000,000 | 28,400,000 | 9,000,000 | 12,300,000 | 12,200,000 | 10,600,000 | 9,100,000 | 7,100,000 | 34,800,000 | 6,100,000 | 5,000,000 | 28,200,000 | 8,600,000 | 9,300,000 | 6,300,000 | 11,500,000 | 10,100,000 | 18,500,000 | 20,900,000 | 20,500,000 | 10,100,000 | 70,500,000 |  | 20,300,000 | 23,100,000 | 10,900,000 | 42,300,000 | 9,500,000 | 11,400,000 | 9,500,000 | 39,600,000 |  |  |  | 14,200,000
Amortization of principal | 206,000 |  |  |  |  |  |  | 670,000 | 1,100,000 | 1,500,000 | 469,000 | 644,000 | 621,000 | 566,000 | 262,000 | 367,000 | 962,000 | 285,000 | 126,000 | 718,000 | 199,000 | 194,000 | 649,000 | 346,000 | 291,000 | 482,000 | 616,000 | 596,000 | 332,000 | 2,700,000 | 911,000 |  | 996,000 | 451,000 | 1,400,000 | 282,000 | 609,000 | 105,000 |  |  |  |  | 161,000
Number of shopping centers |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount | $ 15,600,000 | $ 10,500,000 |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,500,000 |  |  |  | $ 125,000,000 |  | $ 38,000,000 | $ 43,000,000 | $ 20,000,000 | $ 73,000,000 | $ 18,000,000 | $ 35,000,000 | $ 18,000,000 |  | $ 71,580,000 | $ 175,000,000 |  |
Interest rate spread on LIBOR | 1.65% |  |  | 1.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.90% |
Debt maturity extension period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Debt instrument fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |
Debt instrument frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |

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