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Employee benefit plans - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2014
shares
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding   $ 83,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 108,846 $ 1,425,339  
Number of stock-based employee compensation plans | plan   3    
Defined Contribution Plan Minimum Annual Contributions Per Employee Percent   1.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   86.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   4.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares   $ 18.40 $ 11.51 $ 8.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 633,600 $ 253,300 $ 4,600
Allocated Share-based Compensation Expense   $ 80,583 71,399 10,887
Employee Stock Ownership Plan (ESOP), Shares in ESOP | shares   5,000,000    
Shares held in Employee Stock Option Plan, Suspense Shares | shares   4,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 26,900 16,000 5,200
Restricted Stock and Early-exercised Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding     1,017  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 0 $ 11,200 $ 6,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares     $ 6.30  
ESPP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Purchase price of common stock as percentage of fair value of Company common stock (percent)   85.00%    
Unearned stock-based compensation costs   $ 600    
Unearned stock-based compensation, expected recognition period   1 month 13 days    
Aggregate shares purchased by employees | shares   436,924    
Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased | $ / shares   $ 26.88    
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unearned stock-based compensation costs   $ 50,200    
Unearned stock-based compensation, expected recognition period   2 years 2 months 12 days    
RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unearned stock-based compensation costs   $ 107,800    
Unearned stock-based compensation, expected recognition period   2 years 6 months 15 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 34,400 $ 28,200  
Shares granted | shares   2,170,000 5,573,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares   $ 32.15 $ 21.98 $ 1.52
RSUs [Member] | Chief Executive Officer (CEO) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unearned stock-based compensation costs   $ 7,000    
Shares granted | shares 4,500,000      
RSUs [Member] | Vested Immediately [Member] | Chief Executive Officer (CEO) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted | shares 1,500,000      
RSUs [Member] | Share-based Compensation Award, Tranche Two [Member] | Chief Executive Officer (CEO) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted | shares 3,000,000      
Allocated Share-based Compensation Expense   $ 29,400 $ 38,300  
2014 Equity Incentive Plans [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period   10 years    
Award vesting period   4 years    
2014 Equity Incentive Plans [Member] | RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   4 years    
Employee Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares   $ 15.76 $ 7.16  
Proceeds from Stock Plans   $ 11,700