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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Schedule Of Income Tax [Line Items]        
Valuation allowance resulting in income tax benefit $ 9,487 $ 9,487 $ 13,725  
Unrecognized stock-based compensation 118,895 118,895   111,635
NOLs deemed worthless   3,487    
Deferred tax asset related to NOLs 0 0    
Income tax expense/(benefit) 9,531 (4,194)    
Gross deferred tax asset 4,238 4,238    
Credit to additional paid-in capital for the amount of NOLs from stock-based compensation 5,293 5,293    
NOLs available for deferred tax asset 20,882 20,882    
U.K. Subsidiaries [Member]
        
Schedule Of Income Tax [Line Items]        
NOLs available for deferred tax asset 816 816    
Deferred tax asset related to NOLs, valuation allowance $ 163 $ 163