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Incremental Common Shares Attributable to Restricted Stock Units

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reconciliation of Weighted Average Shares Used in Computation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share Disclosure [Line Items]
Net loss available to common stockholders	$ (46,873)	$ 214	$ (74,435)	$ (15,786)
Income (loss) available to common stockholders plus assumed exercises and conversion	(46,873)	214	(74,435)	(15,786)
Earnings (loss) per share - basic
Net loss available to common stockholders	21,920	25,765	21,921	25,766
Effect of dilutive securities:
Convertible senior notes
Options and warrants		10
Unvested restricted stock grants		95
Earnings (loss) per share - diluted
Income (loss) available to common stockholders plus assumed exercises and conversion	21,920	25,870	21,921	25,766
Earnings (loss) per share - basic
Net loss available to common stockholders	$ (2.14)	$ 0.01	$ (3.40)	$ (0.61)
Earnings (loss) per share - diluted
Income (loss) available to common stockholders plus assumed exercises and conversion	$ (2.14)	$ 0.01	$ (3.40)	$ (0.61)
4.50% Convertible senior notes
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities
Options and warrants
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities
Unvested restricted stock grants
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities