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Stockholders' equity (deficit) and redeemable convertible preferred stock - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015
Class of Stock Disclosures [Abstract] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 300,000,000
Treasury Stock, Shares, Acquired | 1.5 |  |
Treasury Stock Acquired, Average Cost Per Share | $ 23.05 |  |
Repurchases of outstanding Class A common stock | $ 35,600,000 | $ 35,613,000 |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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