Notes Receivable Backed by Real Estate (Details) (USD $)	6 Months Ended
	Jun. 30, 2011 properties sqft acres	Jun. 30, 2010	Dec. 31, 2010
Notes Receivable Backed By Real Estate (Details) [Abstract]
Notes receivable backed by real estate balance	$ 359,228,000		$ 302,144,000
Addition of notes receivable balance	(55,000,000)	0
Payment received on principal note balance	9,695,000	13,639,000
Notes Receivable Backed by Real Estate (Textuals) [Abstract]
Annual rate for the first three years	7.00%
Annual rate for the fourth year	8.00%
Annual rate for the fifth year	10.00%
Purchased debt securitized by properties	12
$188 million Preferred Equity Interest
Notes Receivable Backed By Real Estate (Details) [Abstract]
Notes receivable backed by real estate balance	189,550,000
Payment received on principal note balance	0
Accrued interest, net of interest payments received	1,668,000
Foreign exchange	0
$55 million preferred equity interest
Notes Receivable Backed By Real Estate (Details) [Abstract]
Notes receivable backed by real estate balance	0
Payment received on principal note balance	0
Accrued interest, net of interest payments received	959,000
Foreign exchange	0
Prologis North American Industrial Fund II
Notes Receivable Backed By Real Estate (Details) [Abstract]
Notes receivable backed by real estate balance	81,540,000
Payment received on principal note balance	2,676,000
Accrued interest, net of interest payments received	0
Foreign exchange	0
Other notes receivable
Notes Receivable Backed By Real Estate (Details) [Abstract]
Notes receivable backed by real estate balance	31,054,000
Payment received on principal note balance	0
Accrued interest, net of interest payments received	0
Foreign exchange	$ 2,133,000