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Equity Award Plans - Schedule of Activity for Restricted Stock (Details) (Restricted Stock Awards and Restricted Stock Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Beginning balance, shares outstanding 3,602  
Granted (shares) 1,097  
Vested (shares) (350)  
Canceled/forfeited (shares) (1)  
Ending balance, shares outstanding 4,348 3,602
Vested and expected to vest (shares) 4,059  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted- Average Grant-Date Fair Value Per Share $ 76.28  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]    
Beginning balance, weighted-average remaining contractual term 2 years 1 year 8 months 12 days
Ending balance, weighted-average remaining contractual term 2 years 1 year 8 months 12 days
Vested and expected to vest, weighted-average remaining contractual term 2 years  
Beginning balance, aggregate intrinsic value $ 157,108  
Ending balance, aggregate intrinsic value 267,755 157,108
Vested and expected to vest, aggregate intrinsic value $ 249,915