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Income Taxes - Schedule of Reconciliation of Gross Net Operating Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]        
Net operating losses $ 140,959 $ 136,515 $ 106,939 $ 101,856
Net operating losses deemed worthless (3,487) (3,487)    
Unrecognized stock-based compensation (111,635) (49,946)    
Gross net operating losses available for deferred tax asset 25,837 83,082    
Tax rate 45.43% 45.22%    
Tax affected $ 11,738 $ 37,571