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Calculation of Basic and Diluted Net Income (loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Basic net income (loss) per share
Net income (loss) applicable to common stockholders	$ 105,631	$ 15,042	$ (167,214)
Undistributed earnings allocated to participating securities	(904)	(84)	0
Net income (loss) applicable to common stockholders excluding amounts applicable to participating securities	104,727	14,958	(167,214)
Weighted average common shares outstanding	68,325	68,086	49,819
Basic net income (loss) per share	$ 1.53	$ 0.22	$ (3.36)
Diluted net income (loss) per share:
Net income (loss) applicable to common stockholders	105,631	15,042	(167,214)
Undistributed earnings allocated to participating securities	(904)	(84)	0
Net income (loss) applicable to common stockholders excluding amounts applicable to participating securities	$ 104,727	$ 14,958	$ (167,214)
Weighted average common shares outstanding	68,325	68,086	49,819
Dilutive stock options and restricted stock	239	332	0
Diluted weighted average common shares outstanding	68,564	68,418	49,819
Diluted net income (loss) per share	$ 1.53	$ 0.22	$ (3.36)

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- Definition

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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