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Net Income Loss and the Number of Shares Used to Compute Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Loss Per Share [Line Items]        
Net loss $ (31,512) $ 15,323 $ (62,638) $ (10,657)
Preferred stock purchase option (see Note 8)     (868)  
Preferred stock beneficial conversion feature (see Note 8) (31,341)   (31,341)  
Net (loss) income applicable to common shareholders-basic (62,853) 15,323 (94,847) (10,657)
Gain on warrant derivative liability   (1,416) (119) (2,381)
Gain on exchangeable senior notes derivative liability   (200)    
Exchangeable senior notes interest   1,960    
Net (loss) income-diluted $ (62,853) $ 15,667 $ (94,966) $ (13,038)
Net (loss) earnings per share-basic $ (0.35) $ 0.09 $ (0.53) $ (0.06)
Weighted average shares outstanding-basic 180,464 172,886 178,036 172,879
Effect of dilutive warrants   963   997
Effect of dilutive exchangeable senior notes (if converted)   31,526    
Weighted average shares outstanding-diluted 180,464 207,674 178,036 173,876
Net (loss) earnings per share-diluted $ (0.35) $ 0.08 $ (0.53) $ (0.07)
Stock Options        
Earnings Loss Per Share [Line Items]        
Effect of dilutive share based compensation   277    
Restricted Stock        
Earnings Loss Per Share [Line Items]        
Effect of dilutive share based compensation   2,022