XML 62 R48.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2015 | Mar. 03, 2015 | Jun. 24, 2014 | Oct. 25, 2013 | Sep. 04, 2013 | May. 28, 2013 | Apr. 10, 2013 | Mar. 19, 2013 | Feb. 27, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  |  |  |  |  |  |  |  | $ 875,200,000 |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | 802,034,000 |  | $ 808,997,000 |
Debt outstanding |  |  |  |  |  |  |  |  |  |  | 875,242,000 |  | 857,400,000 |
Debt outstanding with fixed-rate |  |  |  |  |  |  |  |  |  |  |  |  | 784,800,000 |
Debt outstanding with variable-rate |  |  |  |  |  |  |  |  |  |  |  |  | 72,600,000 |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 246,552,000 |  |  |
Outstanding line of credit |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  | 43,000,000 |
Letter of credit facility |  |  |  |  |  |  |  |  |  |  | 448,000 |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  |  |  |  | 51,000,000 |  | $ 51,000,000 |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 250,543,000 |  |  |
Debt instrument fixed interest rate |  |  |  |  |  |  |  |  |  |  | 3.75% |  | 3.65% |
Capitalization of debt issuance cost |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  | $ 1,300,000 | $ 3,200,000
Metro Pike Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  |  |  | 1.65% |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  |  | $ 15,600,000 |  |  |  |
Principal amortization period |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  | $ 14,800,000 |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Existing loan extension period |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  | $ 15,900,000 |  |  |  |
Northrock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  |  |  | 1.65% |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Principal amortization period |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  | $ 14,200,000 |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Cruse Market Place |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  | $ 6,900,000 |  |  |  |  |  |
4.04% due April 2028 | Hampshire Langley |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  | $ 18,000,000 |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  | 95,400 |  |  |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  | $ 9,500,000 |  |  |  |  |
Debt instrument fixed interest rate |  |  |  |  |  |  |  |  | 4.04% |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
3.51% due June 2028 | Beacon Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  | $ 203,200 |  |  |  |  |  |  |
Principal amortization period |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  | $ 11,400,000 |  |  |  |  |  |  |
Debt instrument fixed interest rate |  |  |  |  |  |  | 3.51% |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |
3.99% due September 2028 | Seabreeze Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |
Debt instrument fixed interest rate |  |  |  |  |  | 3.99% |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  | $ 13,500,000 |  |  |  |  |  |  |  |
Payments of debt extinguishment costs |  |  |  |  |  | 497,000 |  |  |  |  |  |  |  |
4.88% due September 2032 | Park Van Ness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amortization period |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |
Debt instrument fixed interest rate |  |  |  |  | 4.88% |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 275,000,000.0 |  |  |  |  |  |  |  |  |  |
Extension in line of credit facility period |  |  |  | 1 year |  |  |  |  |  |  | 1 year |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  |  |  |  | 1.45% |  |  |
Fixed Rate Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | $ 832,441,000 |  | 784,757,000 |
Debt instrument fixed interest rate | [1] |  |  |  |  |  |  |  |  |  | 5.53% |  |  |
Fixed Rate Mortgage Notes Payable | Metro Pike Center Bank Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  |  |  |  | $ 7,800,000 |  |  |
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | $ 67,850,000 | [2] | 69,397,000 |
Debt instrument fixed interest rate | [1] |  |  |  |  |  |  |  |  |  | 5.84% |  |  |
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 | Seven Corners Shopping Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  |  |  | $ 73,000,000 |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  |  |  | $ 463,200 |  |  |
Principal amortization period |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  |  | $ 42,300,000 |  |  |
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | $ 16,826,000 | [3] | 17,281,000 |
Debt instrument fixed interest rate | [1] |  |  |  |  |  |  |  |  |  | 4.04% |  |  |
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 | Hampshire Langley |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  |  |  | $ 95,400 |  |  |
Principal amortization period |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  |  | 9,500,000 |  |  |
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | $ 31,844,000 | [4] | 33,140,000 |
Debt instrument fixed interest rate | [1] |  |  |  |  |  |  |  |  |  | 3.51% |  |  |
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 | Beacon Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  |  |  | $ 203,200 |  |  |
Principal amortization period |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  |  | $ 11,400,000 |  |  |
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | $ 17,011,000 | [5] | 17,462,000 |
Debt instrument fixed interest rate | [1] |  |  |  |  |  |  |  |  |  | 3.99% |  |  |
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 | Seabreeze Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  | $ 94,900 |  |  |  |  | $ 94,900 |  |  |
Principal amortization period |  |  |  |  |  | 25 years |  |  |  |  | 25 years |  |  |
Debt instrument required final principal payment |  |  |  |  |  | $ 9,500,000 |  |  |  |  | $ 9,500,000 |  |  |
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  |  |  |  | $ 45,208,000 | [6] | 5,391,000 |
Debt instrument fixed interest rate | [1] |  |  |  |  |  |  |  |  |  | 4.88% |  |  |
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 | Park Van Ness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  | $ 71,600,000 |  |  |  |  |  | $ 71,600,000 |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  |  |  | $ 413,500 |  |  |
Principal amortization period |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  |  | $ 39,600,000 |  |  |
Variable Rate Loans Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate loans |  |  |  |  |  |  |  |  |  |  | $ 42,801,000 |  | 72,631,000 |
Interest rate spread on LIBOR | [1] |  |  |  |  |  |  |  |  |  | 1.94% |  |  |
Variable Rate Loans Payable | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate loans |  |  |  |  |  |  |  |  |  |  | $ 28,000,000 | [7] | 43,000,000 |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |
Interest rate spread on LIBOR | [1] |  |  |  |  |  |  |  |  |  | 1.45% |  |  |
Variable Rate Loans Payable | Northrock Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate loans |  |  |  |  |  |  |  |  |  |  | $ 0 | [8] | 14,525,000 |
Interest rate spread on LIBOR | [1] |  |  |  |  |  |  |  |  |  | 1.65% |  |  |
Variable Rate Loans Payable | Northrock Loan | Northrock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  |  |  | $ 47,000 |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  |  | 14,200,000 |  |  |
Variable Rate Loans Payable | Metro Pike Center Bank Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate loans |  |  |  |  |  |  |  |  |  |  | $ 14,801,000 | [9] | 15,106,000 |
Interest rate spread on LIBOR | [1] |  |  |  |  |  |  |  |  |  | 1.65% |  |  |
Variable Rate Loans Payable | Metro Pike Center Bank Loan | Metro Pike Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  |  |  |  |  |  |  |  |  | $ 48,000 |  |  |
Debt instrument required final principal payment |  |  |  |  |  |  |  |  |  |  | 14,800,000 |  |  |
Debt Covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of properties collateralized |  |  |  |  |  |  |  |  |  |  | $ 856,800,000 |  | $ 895,500,000 |
Debt covenant, percentage of net proceeds of additional equity issuance |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Credit agreement leverage ratio |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |
Interest coverage ratio required minimum |  |  |  |  |  |  |  |  |  |  | 2.0 |  |  |
Required fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  | 1.3 |  |  |
Minimum | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  |  |  |  | 1.45% |  |  |
Minimum | Debt Covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant required net assets |  |  |  |  |  |  |  |  |  |  | $ 542,100,000 |  |  |
Maximum | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
Shops at Fairfax and Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument fixed interest rate |  |  | 3.69% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Shops at Fairfax and Boulevard | Fixed Rate Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  |  | $ 153,300 |  |  |  |  |  |  |  |  |  |  |
Debt instrument required final principal payment |  |  | $ 15,500,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument amortization period |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 15,200,000 |  |  |  |  |  |  |  |  |  |  |
Northrock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument fixed interest rate |  | 3.99% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Northrock | Fixed Rate Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required periodic principal and interest payment |  | $ 84,400 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument required final principal payment |  | $ 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amortization period |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Interest rate and scheduled maturity data presented as of December 31, 2015. Totals computed using weighted averages.
[2] | 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.
[3] | 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.
[4] | 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.
[5] | 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.
[6] | 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.
[7] | 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.
[8] | 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.
[9] | 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.

X
- Definition Credit Agreement Leverage Ratio + References No definition available. + Details
Name: | bfs_CreditAgreementLeverageRatio
Namespace Prefix: | bfs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Amortization Period + References No definition available. + Details
Name: | bfs_DebtInstrumentAmortizationPeriod
Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument Amortization Periods + References No definition available. + Details
Name: | bfs_DebtInstrumentAmortizationPeriods
Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument Covenant, Required Net Assets + References No definition available. + Details
Name: | bfs_DebtInstrumentCovenantRequiredNetAssets
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Instrument, Final Payment Amount + References No definition available. + Details
Name: | bfs_DebtInstrumentFinalPaymentAmount
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument Percentage of Net Proceeds of Additional Equity Issuance + References No definition available. + Details
Name: | bfs_DebtInstrumentPercentageOfNetProceedsOfAdditionalEquityIssuance
Namespace Prefix: | bfs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Existing Loan Extension Period + References No definition available. + Details
Name: | bfs_ExistingLoanExtensionPeriod
Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest Coverage Ratio Required Minimum + References No definition available. + Details
Name: | bfs_InterestCoverageRatioRequiredMinimum
Namespace Prefix: | bfs_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Letter of Credit Facilities, Maximum Borrowing Capacity + References No definition available. + Details
Name: | bfs_LetterOfCreditFacilitiesMaximumBorrowingCapacity
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility Potential Term Extension Period + References No definition available. + Details
Name: | bfs_LineOfCreditFacilityPotentialTermExtensionPeriod
Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-Term Debt, Repayments of Principal and Balloon Payments + References No definition available. + Details
Name: | bfs_LongTermDebtRepaymentsOfPrincipalAndBalloonPayments
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Required Fixed Charge Coverage Ratio + References No definition available. + Details
Name: | bfs_RequiredFixedChargeCoverageRatio
Namespace Prefix: | bfs_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
Name: | us-gaap_LoansPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
Name: | us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal. + References No definition available. + Details
Name: | us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729 + Details
Name: | us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
Name: | us-gaap_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of other collateralized debt obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_SecuredDebtOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_MetroPikeCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_NorthrockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_CruseMarketPlaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_HampshireLangleyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BeaconCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_SeabreezePlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_ParkVanNessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=bfs_UnsecuredRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=bfs_FixedRateMortgageNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_MetroPikeCenterBankLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_SevenCornersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=bfs_VariableRateLoansPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_UnsecuredRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_NorthrockLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=bfs_DebtCovenantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bfs_ShopsatFairfaxandBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bfs_NorthrockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |