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Net income per share attributable to common stockholders - Additional Information (Details)	9 Months Ended
	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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- Definition

Common Stock, Voting Rights, Number

+ References

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- Definition

Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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