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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Net loss $ (98,900) $ (32,611) $ (140,721) $ (50,148)
Less: Preferred stock dividends (1,725) 0 (5,175) 0
Loss attributable to common shareholders - Basic and Diluted $ (100,625) $ (32,611) $ (145,896) $ (50,148)
Weighted-average shares - Basic 65,465,000 46,050,000 61,272,000 46,009,000
Effect of dilutive securities 0 [1] 0 [1] 0 [1] 0 [1]
Weighted-average shares - Diluted 65,465,000 46,050,000 61,272,000 46,009,000
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) 19,200,000 100,000 100,000 100,000
[1] For the three and nine months ended September 30, 2013, 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.