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Commitments and contingencies - Additional information (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended
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Mar. 27, 2019 lawsuit | Jan. 15, 2018 plaintiff | Jan. 14, 2018 plaintiff | Aug. 01, 2016 employee | Feb. 28, 2019 USD ($) | Mar. 31, 2017 lawsuit | Aug. 31, 2016 lawsuit | Feb. 03, 2018 employee
EPA Collective Action |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of employees opted in lawsuit (employee) (plaintiff) |  | 254 | 70,000 | 10,314 |  |  |  | 9,124
S.D.N.Y. Cases |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
New claims filed, number | lawsuit | 2 |  |  |  |  | 2 | 2 |
Consumer FInancial Protection Bureau |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency, damages paid, value |  |  |  |  | $ 10,000,000 |  |  |
New York Attorney General |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency, damages paid, value |  |  |  |  | $ 1,000,000 |  |  |

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