Quarterly report pursuant to Section 13 or 15(d)

Mortgages Payable (Narrative) (Details)

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Mortgages Payable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Mortgages Payable [Line Items]  
Premium on mortgages $ 0.1
Locke Sovran II LLC [Member] | 7.19% Mortgage Note Due March 2012 [Member]
 
Mortgages Payable [Line Items]  
Self-storage facilities 27
Locke Sovran I LLC [Member] | 7.80% Mortgage Note Due December 2011 [Member]
 
Mortgages Payable [Line Items]  
Self-storage facilities 11
Line of Credit - Variable Rate LIBOR + 2.0% (2.23% at September 30, 2011) [Member]
 
Mortgages Payable [Line Items]  
Interest rate at end of period 2.23%
Term Note - Variable Rate LIBOR+2.0% (2.23% at September 30, 2011) [Member]
 
Mortgages Payable [Line Items]  
Interest rate at end of period 2.23%
Term Note - Variable Rate LIBOR+1.50% (1.99% at September 30, 2011) [Member]
 
Mortgages Payable [Line Items]  
Interest rate at end of period 1.99%
7.80% Mortgage Note Due December 2011 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 7.80%
Mortgage note due date December 2011
Aggregate net book value of property pledged for mortgage note 41.4
Effective interest rate 7.50%
7.19% Mortgage Note Due March 2012 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 7.19%
Mortgage note due date March 2012
Aggregate net book value of property pledged for mortgage note 79.0
Effective interest rate 7.35%
7.25% Mortgage Note Due December 2011 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 7.25%
Mortgage note due date December 2011
Self-storage facilities 1
Aggregate net book value of property pledged for mortgage note 5.4
Effective interest rate 5.74%
Estimated market rate at time of acquisition 5.40%
6.76% Mortgage Note Due September 2013 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 6.76%
Mortgage note due date September 2013
Self-storage facilities 1
Aggregate net book value of property pledged for mortgage note 1.9
Effective interest rate 6.87%
6.35% Mortgage Note Due March 2014 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 6.35%
Mortgage note due date March 2014
Self-storage facilities 1
Aggregate net book value of property pledged for mortgage note 3.6
Effective interest rate 6.45%
7.50% Mortgage Note Repaid August 2011 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 7.50%
Mortgage note due date August 2011
Self-storage facilities 3
5.99% Mortgage Note Due May 2026 [Member]
 
Mortgages Payable [Line Items]  
Mortgage note stated interest rate 5.99%
Mortgage note due date May 2026
Self-storage facilities 1
Aggregate net book value of property pledged for mortgage note $ 4.2
Effective interest rate 5.99%