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Stockholders' equity - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May. 31, 2015 shares | Apr. 30, 2015 shares | Jun. 30, 2014 shares | Sep. 30, 2015 USD ($) | Jun. 30, 2015 shares | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) plan $ / shares shares | Sep. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 300,000 |  |  | $ 300,000 |
Number of stock-based employee compensation plans | plan |  |  |  |  |  |  | 3 |
Stock-based compensation |  |  |  | 17,870 |  | $ 13,913 | $ 62,560 | $ 52,143
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 |  |  |  | 1,700 |  |  | $ 1,700 |
Unearned stock-based compensation, expected recognition period |  |  |  |  |  |  | 4 months 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-based compensation |  |  |  | 1,000 |  |  | $ 3,000 |
Stock Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unearned stock-based compensation costs |  |  |  | 54,600 |  |  | $ 54,600 |
Unearned stock-based compensation, expected recognition period |  |  |  |  |  |  | 2 years 3 months 22 days |
RSUs [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unearned stock-based compensation costs |  |  |  | 107,300 |  |  | $ 107,300 |
Unearned stock-based compensation, expected recognition period |  |  |  |  |  |  | 2 years 6 months 4 days |
Shares granted | shares |  |  |  |  |  |  | 1,525,000 |
RSUs [Member] | Chief Executive Officer (CEO) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unearned stock-based compensation costs |  |  |  | 10,200 |  |  | $ 10,200 |
Shares granted | shares |  |  | 4,500,000 |  |  |  |  |
RSUs [Member] | Chief Executive Officer (CEO) [Member] | Vested Immediately [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted | shares |  |  | 1,500,000 |  |  |  |  |
RSUs [Member] | Chief Executive Officer (CEO) [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted | shares |  |  | 3,000,000 |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 4,300 |  |  | $ 26,100 |
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 |
Common Class B [Member] | Chief Executive Officer (CEO) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares contributed to company without consideration | shares | 4,678,180 | 180,000 |  |  | 4,858,180 |  |  |

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