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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 |  |

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units. + References No definition available. + Details
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