Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation Plans and Awards - Narrative (Details)

v3.3.1.900
Stock-based Compensation Plans and Awards - Narrative (Details)
 1 Months Ended 11 Months Ended 12 Months Ended
Jun. 14, 2011
shares
Mar. 31, 2015
performance_period
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2011
Stock-based Compensation Plans and Awards              
Shares of common stock previously reserved but unissued (in shares) | shares         15,042,664 18,184,195  
Annual fixed increase alternative, increase in shares of common stock reserved for issuance (in shares) | shares 10,000,000            
Annual percentage increase alternative, increase in common stock reserved for issuance as a percentage of common stock outstanding 4.00%            
Stock-based compensation expense       $ 40,041,000 $ 111,645,000 $ 87,055,000  
ESPP shares issued (in shares) | shares         538,398    
Weighted-average period for recognition of unrecognized compensation         4 years    
Capitalized cost related to internal use software and website development costs     $ 700,000 700,000 $ 2,700,000 1,300,000  
Stock options              
Stock-based Compensation Plans and Awards              
Stock-based compensation expense       $ 10,600,000 $ 10,700,000 $ 14,700,000  
Weighted-average fair value of stock option granted (in dollars per share) | $ / shares       $ 9.34 $ 9.08 $ 19.74  
Total grant date fair value of stock options vested       $ 9,100,000 $ 17,600,000 $ 16,000,000  
Aggregate intrinsic value of options exercised       93,800,000 9,500,000 169,200,000  
Total fair value of options vested       $ 9,400,000 17,600,000 16,500,000  
Employee stock              
Stock-based Compensation Plans and Awards              
Shares of common stock reserved for the issuance (in shares) | shares     4,000,000 4,000,000      
Percentage of payroll deductions of eligible employees to purchase shares of common stock (up to)     15.00% 15.00%      
Maximum amount of payroll deductions eligible employees can use per calendar year     $ 25,000        
Offering period     6 months        
Exercise price as a percentage of the fair market value of the common stock     85.00%        
Amounts withheld in contributions from employees         7,600,000 6,400,000  
Stock-based compensation expense       $ 0 $ 3,300,000 $ 2,100,000  
ESPP shares issued (in shares) | shares         538,398 149,378  
Weighted average purchase price (in dollars per share) | $ / shares         $ 17.80 $ 23.95  
Unrecognized compensation cost         $ 32,200,000    
Weighted-average period for recognition of unrecognized compensation         2 years 5 months 19 days    
RSUs              
Stock-based Compensation Plans and Awards              
Vesting period         4 years    
Stock-based compensation expense       28,900,000 $ 96,100,000 $ 69,900,000  
Weighted-average period for recognition of unrecognized compensation         2 years 9 months    
Compensation cost not yet recognized         $ 256,100,000    
Grants in period (in shares) | shares         11,678,792    
Market stock units granted              
Stock-based Compensation Plans and Awards              
Stock-based compensation expense       $ 0 $ 1,500,000 $ 0  
Weighted-average period for recognition of unrecognized compensation         2 years 1 month 17 days    
Total grant date fair value of stock options vested         $ 4,300,000    
Compensation cost not yet recognized         $ 2,800,000    
Number of performance periods used for measurement | performance_period   3          
Total stockholder return, duration period   90 days          
Performance multiplier, percentage point decrease   3.00%          
Performance multiplier, percentage point increase   2.00%          
Grants in period (in shares) | shares         776,000    
Market stock units granted | One-Year Performance Period              
Stock-based Compensation Plans and Awards              
Vesting percent   33.33%          
Market stock units granted | Two-Year Performance Period              
Stock-based Compensation Plans and Awards              
Vesting percent   33.33%          
Market stock units granted | Maximum | One and Two-Year Performance Period              
Stock-based Compensation Plans and Awards              
Performance multiplier   100.00%          
Market stock units granted | Maximum | Three-Year Performance Period              
Stock-based Compensation Plans and Awards              
Performance multiplier   200.00%          
2011 Plan              
Stock-based Compensation Plans and Awards              
Shares of common stock reserved for the issuance (in shares) | shares 12,000,000            
2011 Plan | Stock options              
Stock-based Compensation Plans and Awards              
Vesting period             4 years
2011 Plan | Stock options | Maximum              
Stock-based Compensation Plans and Awards              
Expiration term (no more than)             10 years
2004 Plan              
Stock-based Compensation Plans and Awards              
Shares of common stock previously reserved but unissued (in shares) | shares 1,506,424