Note 17 - Preferred Stock (Detail) (USD $)	3 Months Ended			9 Months Ended		3 Months Ended			3 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012 Subsequent Event [Member] Series G Preferred Stock [Member]	Mar. 31, 2012 Series I Preferred Stock [Member]	Sep. 30, 2012 Series I Preferred Stock [Member]	Sep. 30, 2012 Series J Preferred Stock [Member]	Sep. 30, 2012 Series F Preferred Stock [Member]	Dec. 31, 2011 Series F Preferred Stock [Member]	Sep. 30, 2012 Series G Preferred Stock [Member]	Dec. 31, 2011 Series G Preferred Stock [Member]	Sep. 30, 2012 Series I and J Preferred Stock [Member]	Sep. 30, 2012 Series H Preferred Stock [Member]	Dec. 31, 2011 Series H Preferred Stock [Member]	Sep. 30, 2012 Preferred Depositary Shares [Member]
Stock Issued During Period, Shares, New Issues (in Shares)							16,000,000		9,000,000
Preferred Stock, Dividend Rate, Percentage						7.75%	6.00%		5.50%	6.65%
Preferred Stock, Par or Stated Value Per Share						$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00		$ 1.00	$ 1.00
Preferred Stock, Initial Offering Price							$ 25.00		$ 25.00
Preferred Stock, Dividend Rate, Per-Dollar-Amount							$ 1.50		$ 1.375
Preferred Stock, Redemption Price Per Share							$ 25.00		$ 25.00
Proceeds from Issuance of Redeemable Preferred Stock (in Dollars)		$ 387,200,000							$ 217,800,000
Stock Redeemed or Called During Period, Shares (in Shares)						18,400,000				7,000,000
Payments for Repurchase of Redeemable Preferred Stock (in Dollars)				175,000,000						175,000,000
Dividends, Preferred Stock (in Dollars)	21,622,000		14,841,000	58,037,000	44,522,000					1,000,000
Redemption Premium (in Dollars)	6,213,000			6,213,000		15,500,000				6,200,000
Preferred Stock, Redemption Amount (in Dollars)						460,000,000
Dividends Payable, Current (in Dollars)						$ 8,500,000
Number of Votes														1,000
Number of Proxies														1,000
Number of Votes, Depositary														1
Preferred Stock, Liquidation Preference Per Share								$ 25,000.00	$ 25,000.00			$ 2,500.00			$ 2,500.00		$ 25.00