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Equity - Preferred Stock Dividends (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Class of Stock
Dividends Paid	$ 3,315	$ 3,315	$ 28,453	$ 28,453
Dividends Unpaid	10,566	10,566	13,191	13,191
Total	13,881	13,881	41,644	41,644
8.5% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	2,815	2,815	14,078	14,078
Dividends Unpaid	2,816	2,816	2,816	2,816
Total	5,631	5,631	16,894	16,894
6.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	500	500	6,500	6,500
Dividends Unpaid	2,500	2,500	2,500	2,500
Total	3,000	3,000	9,000	9,000
7.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	0	0	7,875	7,875
Dividends Unpaid	5,250	5,250	7,875	7,875
Total	$ 5,250	$ 5,250	$ 15,750	$ 15,750