Note 17 - Preferred Stock, Common Stock and Convertible Unit Transactions (Detail) - Outstanding Preferred Stock (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Shares Authorized	5,961,200	5,146,000
Liquidation Preference (in Dollars)	$ 975,000	$ 810,000
Par Value (in Dollars per share)	$ 1.00	$ 1.00
Series H Preferred Stock [Member]
Shares Authorized	70,000	70,000
Shares Outstanding	70,000	70,000
Liquidation Preference (in Dollars)	175,000	175,000
Dividend Rate	6.90%	6.90%
Dividend Payout (in Dollars per share)	$ 1.72500	$ 1.72500
Par Value (in Dollars per share)	$ 1.00	$ 1.00
Series I Preferred Stock [Member]
Shares Authorized	18,400
Shares Outstanding	16,000
Liquidation Preference (in Dollars)	400,000
Dividend Rate	6.00%
Dividend Payout (in Dollars per share)	$ 1.50000
Par Value (in Dollars per share)	$ 1.00
Series J Preferred Stock [Member]
Shares Authorized	9,000
Shares Outstanding	9,000
Liquidation Preference (in Dollars)	225,000
Dividend Rate	5.50%
Dividend Payout (in Dollars per share)	$ 1.37500
Par Value (in Dollars per share)	$ 1.00
Series K Preferred Stock [Member]
Shares Authorized	8,050
Shares Outstanding	7,000
Liquidation Preference (in Dollars)	175,000
Dividend Rate	5.625%
Dividend Payout (in Dollars per share)	$ 1.40625
Par Value (in Dollars per share)	$ 1.00
Total [Member]
Shares Authorized	105,450	954,000
Shares Outstanding	102,000	954,000
Liquidation Preference (in Dollars)	975,000	810,000
Series F Preferred Stock [Member]
Shares Authorized		700,000
Shares Outstanding		700,000
Liquidation Preference (in Dollars)		175,000
Dividend Rate		6.65%
Dividend Payout (in Dollars per share)		$ 1.66250
Par Value (in Dollars per share)		$ 1.00
Series G Preferred Stock [Member]
Shares Authorized		184,000
Shares Outstanding		184,000
Liquidation Preference (in Dollars)		$ 460,000
Dividend Rate		7.75%
Dividend Payout (in Dollars per share)		$ 1.93750
Par Value (in Dollars per share)		$ 1.00