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Income Taxes - Schedule of Annual Limitations for Net Operating Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]        
Total $ 140,959 $ 136,515 $ 106,939 $ 101,856
Annual Prospective Limitation 68,688      
Annual Deemed Worthless 3,487      
1998 - 2004 [Member]
        
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]        
Total 14,049      
Annual Prospective Limitation 524      
Annual Deemed Worthless 3,487      
2005 - 2012 [Member]
        
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]        
Total 118,166      
Annual Prospective Limitation 68,164      
Annual Deemed Worthless         
2012 - 2013 [Member]
        
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]        
Total 8,744      
Annual Prospective Limitation         
Annual Deemed Worthless