Basic and Diluted Net (Loss) Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended		395 Months Ended
	Jun. 30, 2013	Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013
Earnings Per Share [Abstract]
Net (loss) income	$ (19,051)	$ 8,038		$ (61,135)	$ (9,666)	$ (492,386)
Weighted-average number of shares of common stock and common stock equivalents outstanding:
Weighted-average number of common shares outstanding for computing basic earnings per share	31,984	22,624		31,899	22,624
Dilutive effect of outstanding warrants and stock awards after application of the treasury stock method		34	[1]
Weighted-average number of common shares outstanding for computing diluted earnings per share	31,984	22,658		31,899	22,624
Net (loss) income per share - basic	$ (0.60)	$ 0.36		$ (1.92)	$ (0.43)
Net (loss) income per share - diluted	$ (0.60)	$ 0.35		$ (1.92)	$ (0.43)

[1] Warrants, stock options, restricted stock units (RSUs) and stock appreciation rights (SARs) to purchase approximately 6,788,000 and 6,949,000 shares of common stock were excluded from the net loss per share calculation for the three months ended June 30, 2013 and 2012, respectively, as their effect would have been anti-dilutive. Additionally, warrants, stock options, RSUs and SARs to purchase approximately 6,788,000 and 6,992,000 shares of common stock were excluded from the net loss per share calculation for the six months ended June 30, 2013 and 2012, respectively, as their effect would have been anti-dilutive.