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Mortgages Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum | Dec. 31, 2013 Kentlands Square II and Cranberry Square Loan | Dec. 31, 2013 White Oak Shopping Center | Dec. 31, 2013 Metro Pike Center | Dec. 31, 2013 Northrock | Dec. 31, 2013 Cruse Market Place | Dec. 31, 2013 Beacon Center | Dec. 31, 2013 Northrock Loan | Dec. 31, 2013 Northrock Loan Northrock | 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 Shopping Center | 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 Fixed Rate Mortgage Notes Payable | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable White Oak Shopping Center | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable Metro Pike Center bank loan | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 5.31% due April 2026 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 5.31% due April 2026 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 4.30% due October2026 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 4.30% due October2026 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 4.53% due November 2026 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 4.53% due November 2026 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 4.70% due December 2026 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 4.70% due December 2026 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 5.84% due May 2027 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 5.84% due May 2027 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 4.04% due April 2028 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 4.04% due April 2028 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 3.51% due June 2028 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 3.51% due June 2028 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 3.99% due September 2028 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 3.99% due September 2028 | Dec. 31, 2013 Fixed Rate Mortgage Notes Payable 4.88% due September 2032 | Dec. 31, 2012 Fixed Rate Mortgage Notes Payable 4.88% due September 2032 | Dec. 31, 2013 Variable Rate Loans Payable | Dec. 31, 2012 Variable Rate Loans Payable | Dec. 31, 2013 Variable Rate Loans Payable Northrock Loan | Dec. 31, 2012 Variable Rate Loans Payable Northrock Loan | Dec. 31, 2013 Variable Rate Loans Payable Metro Pike Center bank loan | Dec. 31, 2012 Variable Rate Loans Payable Metro Pike Center bank loan | Dec. 31, 2013 Debt Covenant | Dec. 31, 2012 Debt Covenant | Dec. 31, 2013 Debt Covenant Minimum | Dec. 31, 2013 Unsecured Revolving Credit Facility | Dec. 31, 2013 Unsecured Revolving Credit Facility LIBOR | Dec. 31, 2013 Unsecured Revolving Credit Facility LIBOR Minimum | Dec. 31, 2013 Unsecured Revolving Credit Facility LIBOR Maximum
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages | $ 820,068,000 |  | $ 789,776,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 789,872,000 |  | $ 774,831,000 |  |  | $ 118,128,000 | [1] | $ 120,822,000 | $ 36,075,000 | [2] | $ 36,986,000 | $ 40,974,000 | [3] | $ 41,970,000 | $ 19,118,000 | [4] | $ 19,569,000 | $ 70,856,000 | [5] | $ 72,233,000 | $ 17,718,000 | [6] | $ 0 | $ 34,391,000 | [7] | $ 0 | $ 17,895,000 | [8] | $ 0 | $ 0 | [9] | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,196,000 |  | 52,945,000 | 14,802,000 | [10] | 14,945,000 | 15,394,000 | [11] | 0 |  |  |  |  |  |  |
Debt outstanding | 820,068,000 |  | 827,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding with fixed-rate |  |  | 774,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding with variable-rate |  |  | 53,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 164,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 |  |  |
Line of credit facility maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 20, 2016 |  |  |
Extension in line of credit facility period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Letter of credit facility | 628,229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  | 1.60% | 2.50% |  |  | 1.65% | 1.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.65% |  |  | 1.65% |  |  | 1.65% |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure | 51,000,000 |  | 51,000,000 |  |  |  |  |  |  |  |  |  | 7,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity term | 9 years 9 months 15 days | [12] |  |  |  |  | 6 months |  |  |  |  |  |  |  | 15 years |  | 15 years | 15 years | 15 years | 15 years |  |  |  |  |  | 10 years 1 month 0 days | [12] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 2 months 0 days | [12] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  | 60,000,000 | 10,500,000 | 15,600,000 | 15,000,000 |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity year |  |  |  |  |  |  |  |  | 2016 | 2016 |  |  |  |  | 2026 |  | 2026 | 2026 | 2026 | 2027 | 2028 | 2028 | 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument fixed interest rate |  |  |  |  |  |  |  | 8.11% |  |  |  |  |  |  | 5.31% |  | 4.30% | 4.53% | 4.70% | 5.84% | 4.04% | 3.51% | 3.99% |  | 4.88% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  | 48,000 |  |  |  |  | 47,000 | 753,000 |  | 207,000 | 240,000 | 113,000 | 463,200 | 95,400 | 203,200 | 94,900 |  | 413,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amortization period |  |  |  |  |  |  |  | 25 years | 25 years | 25 years |  | 20 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 required final principal payment |  |  |  |  |  |  |  | 18,500,000 | 14,800,000 | 14,200,000 |  |  |  | 14,200,000 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bridge financing loans |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defeased mortgage loan | 71,308,000 |  | 117,595,000 | 82,685,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 | 20,000,000 | 63,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt | 101,600,000 |  | 83,500,000 | 286,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Blended fixed interest rate |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.60% | 1.60% | 2.50%
Debt instrument, term |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  | 15 years | 15 years | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  | 15,900,000 | 15,000,000 | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  | 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Existing loan extension period |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt extinguishment costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 497,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of properties collateralizing mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 907,200,000 | 916,100,000 |  |  |  |  |
Limit in the amount of debt so as to maintain a gross asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 503,300,000 |  |  |  |
Percent of net proceeds from equity offerings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.0 |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.3 |  |  |  |  |  |
Variable interest percent rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |
Capitalization of debt issuance cost | $ 3,200,000 |  | $ 2,200,000 | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The loan is collateralized by Clarendon Center and requires equal monthly principal and interest payments of $753,000 based upon a 25-year amortization schedule and a final payment of $70.5 million at loan maturity. Principal of $2.7 million was amortized during 2013.
[2] | The loan is collateralized by Severna Park MarketPlace and requires equal monthly principal and interest payments of $207,000 based upon a 25-year amortization schedule and a final payment of $20.3 million at loan maturity. Principal of $911,000 was amortized during 2013.
[3] | The loan is collateralized by Kentlands Square II and requires equal monthly principal and interest payments of $240,000 based upon a 25-year amortization schedule and a final payment of $23.1 million at loan maturity. Principal of $996,000 was amortized during 2013.
[4] | The loan is collateralized by Cranberry Square and requires equal monthly principal and interest payments of $113,000 based upon a 25-year amortization schedule and a final payment of $10.9 million at loan maturity. Principal of $451,000 was amortized during 2013.
[5] | The loan in the original amount of $73.0 million closed in May 2012, is collateralized by Seven Corners and requires equal monthly principal and interest payments of $463,200 based upon a 25-year amortization schedule and a final payment of $42.3 million at loan maturity. Principal of $1.4 million was amortized during 2013.
[6] | The loan is collateralized by Hampshire Langley and requires equal monthly principal and interest payments of $95,400 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $282,000 was amortized in 2013.
[7] | The loan is collateralized by Beacon Center and requires equal monthly principal and interest payments of $203,200 based upon a 20-year amortization schedule and a final payment of $11.4 million at loan maturity. Principal of $609,000 was amortized in 2013.
[8] | The loan is collateralized by Seabreeze Plaza and requires equal monthly principal and interest payments of $94,900 based upon a 25-year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $105,000 was amortized in 2013.
[9] | The loan is a $71.6 million construction-to-permanent facility that is collateralized by and will finance a portion of the construction costs of Park Van Ness. During the construction period, interest will be funded by the loan. After conversion to a permanent loan, monthly principal and interest payments totaling $413,500 will be required based upon a 25-year amortization schedule. A final payment of $39.6 million will be due at maturity.
[10] | The loan is collateralized by Northrock and requires monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. Principal of $161,000 was amortized during 2013.
[11] | The loan is collateralized by Metro Pike Center and requires monthly principal and interest payments of approximately $48,000 and a final payment of $14.8 million at loan maturity. Principal of $206,000 was amortized during 2013.
[12] | Interest rate and scheduled maturity data presented as of December 31, 2013. Totals computed using weighted averages.

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