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Net Income (or Loss) and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Earnings Loss Per Share [Line Items] |  |  |  |
Net income (loss)-basic | $ 15,323 | $ (39,774) | $ (10,657) | $ (101,932)
Gain on warrant derivative liability | (1,416) | (12,983) | (2,381) | (18,826)
Gain on exchangeable senior notes derivative liability | (200) |  |  |
Exchangeable senior notes interest | 1,960 |  |  |
Net income (loss)-diluted | $ 15,667 | $ (52,757) | $ (13,038) | $ (120,758)
Net earnings (loss) per share-basic | $ 0.09 | $ (0.26) | $ (0.06) | $ (0.68)
Weighted average shares outstanding-basic | 172,886 | 150,694 | 172,879 | 150,562
Effect of dilutive warrants | 963 | 6,349 | 997 | 6,505
Effect of dilutive exchangeable senior notes if converted | 31,526 |  |  |
Weighted average shares outstanding-diluted | 207,674 | 157,043 | 173,876 | 157,067
Net income (or loss) per share-diluted | $ 0.08 | $ (0.34) | $ (0.07) | $ (0.77)
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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