Components of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Earnings Per Share [Abstract]
Net loss	$ (16,383)		$ (11,899)
Less: Preferred stock dividends	(1,725)		0
Loss attributable to common shareholders - Basic and Diluted	$ (18,108)		$ (11,899)
Weighted-average shares - Basic	55,341,000		45,945,000
Effect of dilutive securities	0	[1]	0	[1]
Weighted-average shares - Diluted	55,341,000		45,945,000
Preferred stock dividend rate	6.00%
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share (less than 0.1 million for the 3 months ended March 31, 2012)	19,200,000		100,000

[1] For the three months ended March 31, 2013 and 2012, respectively, approximately 19.2 million and less than 0.1 million potentially dilutive securities, including the 6% 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.