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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 27, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 802,034 |  | $ 808,997
Interest rate |  |  | 3.75% |  | 3.65%
Scheduled maturity period | [1] |  | 8 years 10 months 7 days |  |
Total notes payable |  |  | $ 875,242 |  | $ 857,388
Interest rate during period | [1] |  | 5.35% |  |
Fixed Rate Mortgage Notes Payable |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 832,441 |  | 784,757
Interest rate | [1] |  | 5.53% |  |
Scheduled maturity period | [1] |  | 9 years 2 months 14 days |  |
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 0 | [2] | 15,399
Interest rate | [1] |  | 7.45% |  |
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 30,778 | [3] | 32,049
Interest rate | [1] |  | 6.01% |  |
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 33,766 | [4] | 35,398
Interest rate | [1] |  | 5.88% |  |
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 10,928 | [5] | 11,454
Interest rate | [1] |  | 5.76% |  |
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 15,098 | [6] | 15,819
Interest rate | [1] |  | 5.62% |  |
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 15,064 | [7] | 15,761
Interest rate | [1] |  | 5.79% |  |
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 13,387 | [8] | 14,014
Interest rate | [1] |  | 5.22% |  |
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 10,587 | [9] | 10,881
Interest rate | [1] |  | 5.60% |  |
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 9,127 | [10] | 9,535
Interest rate | [1] |  | 5.30% |  |
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 40,360 | [11] | 41,441
Interest rate | [1] |  | 5.83% |  |
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 8,025 | [12] | 8,346
Interest rate | [1] |  | 5.81% |  |
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 5,959 | [13] | 6,100
Interest rate | [1] |  | 6.01% |  |
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 34,420 | [14] | 35,222
Interest rate | [1] |  | 5.62% |  |
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 10,492 | [15] | 10,718
Interest rate | [1] |  | 6.08% |  |
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 11,365 | [16] | 11,587
Interest rate | [1] |  | 6.43% |  |
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 14,177 | [17] | 14,909
Interest rate | [1] |  | 6.28% |  |
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 16,348 | [18] | 16,750
Interest rate | [1] |  | 7.35% |  |
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 14,197 | [19] | 14,535
Interest rate | [1] |  | 7.60% |  |
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 25,088 | [20] | 25,639
Interest rate | [1] |  | 7.02% |  |
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 29,714 | [21] | 30,429
Interest rate | [1] |  | 7.45% |  |
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 29,564 | [22] | 30,253
Interest rate | [1] |  | 7.30% |  |
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 15,360 | [23] | 15,735
Interest rate | [1] |  | 6.18% |  |
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 112,299 | [24] | 115,291
Interest rate | [1] |  | 5.31% |  |
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 34,133 | [25] | 35,125
Interest rate | [1] |  | 4.30% |  |
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 38,842 | [26] | 39,932
Interest rate | [1] |  | 4.53% |  |
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 18,150 | [27] | 18,645
Interest rate | [1] |  | 4.70% |  |
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 67,850 | [28] | 69,397
Interest rate | [1] |  | 5.84% |  |
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 16,826 | [29] | 17,281
Interest rate | [1] |  | 4.04% |  |
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 31,844 | [30] | 33,140
Interest rate | [1] |  | 3.51% |  |
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 17,011 | [31] | 17,462
Interest rate | [1] |  | 3.99% |  |
Fixed Rate Mortgage Notes Payable | 3.69% Due March 2030 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 29,444 | [32] | 0
Interest rate | [1] |  | 3.69% |  |
Fixed Rate Mortgage Notes Payable | 3.99% Due April 2030 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 15,748 | [33] | 0
Interest rate | [1] |  | 3.99% |  |
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 45,208 | [34] | 5,391
Interest rate | [1] |  | 4.88% |  |
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034 |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Fixed rate mortgages |  |  | $ 11,282 | [35] | 11,119
Interest rate | [1] |  | 8.00% |  |
Variable Rate Loans Payable |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Variable rate loans |  |  | $ 42,801 |  | 72,631
Interest rate spread on LIBOR | [1] |  | 1.94% |  |
Scheduled maturity period | [1] |  | 1 year 11 months 15 days |  |
Variable Rate Loans Payable | Revolving credit facility |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Variable rate loans |  |  | $ 28,000 | [36] | 43,000
Interest rate spread on LIBOR | [1] |  | 1.45% |  |
Variable Rate Loans Payable | Northrock Loan |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Variable rate loans |  |  | $ 0 | [37] | 14,525
Interest rate spread on LIBOR | [1] |  | 1.65% |  |
Variable Rate Loans Payable | Metro Pike Center Bank Loan |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Variable rate loans |  |  | $ 14,801 | [38] | $ 15,106
Interest rate spread on LIBOR | [1] |  | 1.65% |  |
Northrock |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |
Interest rate spread on LIBOR |  | 1.65% |  |  |
[1] | Interest rate and scheduled maturity data presented as of December 31, 2015. Totals computed using weighted averages.
[2] | The loan was collateralized by Shops at Fairfax and Boulevard shopping centers and required equal monthly principal and interest payments totaling $156,000 based upon a weighted average 23-year amortization schedule and a final payment of $15.2 million was due at loan maturity. In 2015 the loan was repaid in full and replaced with a new $30.0 million loan. See (ee) below.
[3] | The loan is collateralized by Washington Square and requires equal monthly principal and interest payments of $264,000 based upon a 27.5-year amortization schedule and a final payment of $28.0 million at loan maturity. Principal of $1.3 million was amortized during 2015.
[4] | The loan is collateralized by three shopping centers, Broadlands Village, The Glen and Kentlands Square I, and requires equal monthly principal and interest payments of $306,000 based upon a 25-year amortization schedule and a final payment of $28.4 million at loan maturity. Principal of $1.6 million was amortized during 2015.
[5] | The loan is collateralized by Olde Forte Village and requires equal monthly principal and interest payments of $98,000 based upon a 25-year amortization schedule and a final payment of $9.0 million at loan maturity. Principal of $526,000 was amortized during 2015.
[6] | The loan is collateralized by Countryside and requires equal monthly principal and interest payments of $133,000 based upon a 25-year amortization schedule and a final payment of $12.3 million at loan maturity. Principal of $721,000 was amortized during 2015.
[7] | The loan is collateralized by Briggs Chaney MarketPlace and requires equal monthly principal and interest payments of $133,000 based upon a 25-year amortization schedule and a final payment of $12.2 million at loan maturity. Principal of $697,000 was amortized during 2015.
[8] | The loan is collateralized by Shops at Monocacy and requires equal monthly principal and interest payments of $112,000 based upon a 25-year amortization schedule and a final payment of $10.6 million at loan maturity. Principal of $627,000 was amortized during 2015.
[9] | The loan is collateralized by Boca Valley Plaza and requires equal monthly principal and interest payments of $75,000 based upon a 30-year amortization schedule and a final payment of $9.1 million at loan maturity. Principal of $294,000 was amortized during 2015.
[10] | The loan is collateralized by Palm Springs Center and requires equal monthly principal and interest payments of $75,000 based upon a 25-year amortization schedule and a final payment of $7.1 million at loan maturity. Principal of $408,000 was amortized during 2015.
[11] | The loan and a corresponding interest-rate swap closed on June 29, 2010 and are collateralized by Thruway. On a combined basis, the loan and the interest-rate swap require equal monthly principal and interest payments of $289,000 based upon a 25-year amortization schedule and a final payment of $34.8 million at loan maturity. Principal of $1,081,000 was amortized during 2015.
[12] | The loan is collateralized by Jamestown Place and requires equal monthly principal and interest payments of $66,000 based upon a 25-year amortization schedule and a final payment of $6.1 million at loan maturity. Principal of $321,000 was amortized during 2015.
[13] | The loan is collateralized by Hunt Club Corners and requires equal monthly principal and interest payments of $42,000 based upon a 30-year amortization schedule and a final payment of $5.0 million, at loan maturity. Principal of $141,000 was amortized during 2015.
[14] | The loan is collateralized by Lansdowne Town Center and requires monthly principal and interest payments of $230,000 based on a 30-year amortization schedule and a final payment of $28.2 million at loan maturity. Principal of $802,000 was amortized during 2015.
[15] | The loan is collateralized by Orchard Park and requires equal monthly principal and interest payments of $73,000 based upon a 30-year amortization schedule and a final payment of $8.6 million at loan maturity. Principal of $226,000 was amortized during 2015.
[16] | The loan is collateralized by BJ’s Wholesale and requires equal monthly principal and interest payments of $80,000 based upon a 30-year amortization schedule and a final payment of $9.3 million at loan maturity. Principal of $222,000 was amortized during 2015.
[17] | The loan is collateralized by Great Falls shopping center. The loan consists of three notes which require equal monthly principal and interest payments of $138,000 based upon a weighted average 26-year amortization schedule and a final payment of $6.3 million at maturity. Principal of $732,000 was amortized during 2015.
[18] | The loan is collateralized by Leesburg Pike and requires equal monthly principal and interest payments of $135,000 based upon a 25-year amortization schedule and a final payment of $11.5 million at loan maturity. Principal of $402,000 was amortized during 2015.
[19] | The loan is collateralized by Village Center and requires equal monthly principal and interest payments of $119,000 based upon a 25-year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $338,000 was amortized during 2015.
[20] | The loan is collateralized by White Oak and requires equal monthly principal and interest payments of $193,000 based upon a 24.4 year weighted amortization schedule and a final payment of $18.5 million at loan maturity. The loan was previously collateralized by Van Ness Square. During 2012, the Company substituted White Oak as the collateral and borrowed an additional $10.5 million. Principal of $551,000 was amortized during 2015.
[21] | The loan is collateralized by Avenel Business Park and requires equal monthly principal and interest payments of $246,000 based upon a 25-year amortization schedule and a final payment of $20.9 million at loan maturity. Principal of $715,000 was amortized during 2015.
[22] | The loan is collateralized by Ashburn Village and requires equal monthly principal and interest payments of $240,000 based upon a 25-year amortization schedule and a final payment of $20.5 million at loan maturity. Principal of $689,000 was amortized during 2015.
[23] | The loan is collateralized by Ravenwood and requires equal monthly principal and interest payments of $111,000 based upon a 25-year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $375,000 was amortized during 2015.
[24] | 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 $3.0 million was amortized during 2015.
[25] | 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 $992,000 was amortized during 2015.
[26] | 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 $1,090,000 was amortized during 2015.
[27] | 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 $495,000 was amortized during 2015.
[28] | 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 $1.5 million was amortized during 2015.
[29] | 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 $455,000 was amortized in 2015.
[30] | 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 $1,296,000 was amortized in 2015.
[31] | 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 $451,000 was amortized in 2015.
[32] | The loan is collateralized by Shops at Fairfax and Boulevard shopping centers and requires equal monthly principal and interest payments totaling $153,300 based upon a 25-year amortization schedule and a final payment of $15.5 million at maturity. Principal of $556,000 was amortized in 2015.
[33] | The loan is collateralized by Northrock and requires equal monthly principal and interest payments totaling $84,400 based upon a 25-year amortization schedule and a final payment of $8.4 million at maturity. Principal of $252,000 was amortized in 2015.
[34] | 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.
[35] | The Company entered into a sale-leaseback transaction with its Olney property and is accounting for that transaction as a secured financing. The arrangement requires monthly payments of $60,400 which increase by 1.5% on May 1, 2015, and every May 1 thereafter. The arrangement provides for a final payment of $14.7 million and has an implicit interest rate of 8.0%. Negative amortization in 2015 totaled $163,000.
[36] | The loan is a $275.0 million unsecured revolving credit facility. Interest accrues at a rate equal to the sum of one-month LIBOR plus a spread of 145 basis points. The line may be extended at the Company’s option for one year with payment of a fee of 0.15%. Monthly payments, if required, are interest only and vary depending upon the amount outstanding and the applicable interest rate for any given month.
[37] | The loan was collateralized by Northrock and required monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. In 2015 the loan was repaid in full and replaced with a new $16.0 million loan. See (ff) above.
[38] | 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 $305,000 was amortized during 2015.

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