Components of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Earnings Per Share [Abstract]
Net income (loss)	$ 89,661		$ (98,900)		$ 8,102		$ (140,721)
Less: Preferred stock dividends	(7,641)	[1]	(1,725)	[1]	(11,081)	[1]	(5,175)	[1]
Preferred Stock Conversions, Inducements	(888)		0		(4,256)		0
Net income (loss) attributable to common shareholders, Basic	81,132		(100,625)		(7,235)		(145,896)
Other Preferred Stock Dividends and Adjustments	888
Net income (loss) attributable to common shareholders, Diluted	$ 89,661		$ (100,625)		$ (7,235)		$ (145,896)
Weighted-average shares – Basic	71,536,000		65,465,000		67,909,000		61,272,000
Effect of dilutive securities	32,070,000	[2]	0	[2]	0	[2]	0	[2]
Weighted-average shares – Diluted	103,606,000		65,465,000		67,909,000		61,272,000
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share			19,200,000		24,900,000		100,000

[1] Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.

[2] For the nine months ended September 30, 2014, approximately 24.9 million potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share. For the three and nine months ended September 30, 2013, approximately 19.2 million and less than 0.1 million, respectively, potentially dilutive securities, including the Series A Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.