Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				404 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014
Earnings Per Share [Abstract]
Net loss	$ (28,273)		$ (42,084)		$ (571,509)
Weighted average number of shares of common stock and common stock equivalents outstanding:
Weighted-average number of shares of common stock outstanding for computing basic earnings per share	37,821		31,813
Dilutive effect of outstanding warrants and stock options after application of the treasury stock method		[1]		[1]
Weighted-average number of shares of common stock and dilutive common stock equivalents outstanding for computing diluted earnings per share	37,821		31,813
Net loss per share - basic and diluted	$ (0.75)		$ (1.32)

[1] Warrants, stock options, restricted stock awards, restricted stock units and stock appreciation rights to purchase approximately 6,096,000 and 5,997,000 shares of common stock were excluded from the net loss per share calculation for the three months ended March 31, 2014 and 2013, respectively, as their effect would have been anti-dilutive.