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Note 15 - Noncontrolling Interests (Detail) - Redeemed Units (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2007
Dec. 31, 2012
Preferred A Units [Member]
Dec. 31, 2012
Class A Preferred Units [Member]
Dec. 31, 2012
Class B-1 Preferred Units [Member]
Dec. 31, 2012
Class B-2 Preferred Units [Member]
Dec. 31, 2012
Class C DownReit Units [Member]
Units Redeemed   2,200,000 2,000 2,438 5,576 61,804
Par Value Redeemed (in Dollars) $ 1.1 $ 2.2 $ 20.0 $ 24.4 $ 55.8 $ 1.9