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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
Net operating losses expiration period   20 years    
Unrecognized stock-based compensation $ 111,635 $ 111,635 $ 49,946  
Composition of deferred tax asset   45.43% 45.22%  
Deferred tax asset offset by a valuation allowance 21,221 21,221 44,478  
Federal statutory rate   35.00% 35.00% 35.00%
Uncertain tax positions, interest or penalties amount $ 0      
Income tax examination description   Tax returns filed with each jurisdiction remain open to examination under the normal three-year statute of limitations