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Components of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Net loss $ (409,592)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ (143,070)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ (104,589)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less: Preferred stock dividends (17,148)us-gaap_ConvertiblePreferredDividendsNetOfTax [1] (6,900)us-gaap_ConvertiblePreferredDividendsNetOfTax [1] (1,687)us-gaap_ConvertiblePreferredDividendsNetOfTax [1]
Induced conversion of preferred stock (4,256)us-gaap_PreferredStockConversionsInducements 0us-gaap_PreferredStockConversionsInducements 0us-gaap_PreferredStockConversionsInducements
Net loss attributable to common shareholders – basic and diluted $ (430,996)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (149,970)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (106,276)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average shares – basic 68,887,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 62,335,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 47,919,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [2] 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [2] 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [2]
Weighted-average shares – diluted 68,887,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 62,335,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 47,919,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share 26,600,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 19,800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 19,200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] Preferred stock dividends were excluded from diluted earnings per share for the years ended December 31, 2014, 2013 and 2012, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
[2] For 2014, approximately 26.6 million potentially dilutive securities, including the Series A 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 2013 and 2012, approximately 19.8 million and 19.2 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.