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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
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income (loss) $ (57,165)us-gaap_ProfitLoss $ 19,225us-gaap_ProfitLoss
Less: Preferred stock dividends (6,067)us-gaap_ConvertiblePreferredDividendsNetOfTax (1,722)us-gaap_ConvertiblePreferredDividendsNetOfTax
Net income (loss) attributable to common shareholders, Basic (63,232)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 17,503us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add: Preferred stock dividends 0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther [1] 1,722us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
Net income (loss) attributable to common shareholders, Diluted $ (63,232)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 19,225us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted-average shares – basic 71,820,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 65,611,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [2] 20,133,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average shares – diluted 71,820,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,744,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share 31,300,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
[1] Preferred stock dividends were excluded from diluted earnings per share for the three months ended March 31, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
[2] For the three months ended March 31, 2015, approximately 31.3 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.