The Company (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 31, 2014 sqft
Building Size	1,087,000
Net Proceeds	$ 81.3
Miami, FL [Member] | Short term property [Member]
Building Size	53,000
Net Proceeds	4.1
Date of Sale	Sep. 30, 2012
Houston, TX [Member] | Short term property [Member]
Building Size	42,000
Net Proceeds	3.6
Date of Sale	Nov. 30, 2012
Fairfield, CT [Member] | Short term property [Member]
Building Size	43,000
Net Proceeds	5.5
Date of Sale	Dec. 31, 2012
Secaucus, NJ Condo [Member] | Short term property [Member]
Building Size	2,000
Net Proceeds	0.3
Date of Sale	Jan. 31, 2013
Southfield MI [Member] | Short term property [Member]
Building Size	60,000
Net Proceeds	2.5
Date of Sale	Apr. 30, 2013
Marietta, GA [Member] | Short term property [Member]
Building Size	77,000
Net Proceeds	2.9
Date of Sale	Jul. 31, 2013
Ft. Lauderdale [Member] | Short term property [Member]
Building Size	55,000
Net Proceeds	1.9
Date of Sale	Aug. 31, 2013
Elmsford, NY [Member] | Medium term property [Member]
Building Size	59,000
Net Proceeds	22.0
Date of Sale	Aug. 31, 2013
Cherry Hill, NJ [Member] | Short term property [Member]
Building Size	150,000
Net Proceeds	4.5
Date of Sale	Sep. 30, 2013
Addison, IL [Member] | Short term property [Member]
Building Size	68,000
Net Proceeds	1.9
Date of Sale	Dec. 31, 2013
Norcross, GA [Member] | Short term property [Member]
Building Size	69,000
Net Proceeds	1.1
Date of Sale	Feb. 28, 2014
Berwyn, PA [Member] | Short term property [Member]
Building Size	69,000
Net Proceeds	3.0
Date of Sale	Apr. 30, 2014
Secaucus, NJ [Member] | Short term property [Member]
Building Size	340,000
Net Proceeds	$ 28.0
Date of Sale	May 31, 2014