Earnings Per Share - Computation Of Basic And Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net income/ (loss)	$ 35,769	$ (848,735)	$ 8,264	$ (854,102)
Weighted average shares of common stock outstanding (used to calculate basic EPS)	78,582	72,490	75,902	72,063
Shares issuable according to Amended SPA (See Note 3)	3,000	0	3,000	0
Net effect of dilutive employee stock options based on the treasury stock method	209	104	202	115
Weighted average shares of common stock outstanding (used to calculate diluted EPS)	81,791	72,594	79,104	72,178
Net income / (loss) per common share - basic	$ 0.46	$ (11.71)	$ 0.11	$ (11.85)
Net income / (loss) per common share - diluted	$ 0.44	$ (11.71)	$ 0.10	$ (11.85)