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Net income per share attributable to common stockholders - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2015 vote
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Outstanding shares less than 10% of aggregate shares outstanding, conversion ratio | 1
Common Class A [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Common stock, number of voting rights | 1
Common Class B [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Common stock, number of voting rights | 10

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