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Share based compensation - Additional Information (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |
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May 23, 2017 shares | May 24, 2016 shares | May 28, 2015 shares | May 29, 2014 shares | Mar. 31, 2017 shares | Mar. 31, 2016 shares | Jun. 30, 2015 shares | Mar. 31, 2014 shares | Mar. 31, 2013 shares | Jan. 31, 2013 shares | Dec. 31, 2017 USD ($) shares year | Dec. 31, 2016 USD ($) shares year | Dec. 31, 2015 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share options outstanding in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  | 1,182,315 | 963,789 | 1,144,534
Number of share options exercisable in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  | 740,253 | 819,856 |
Number of share options granted (in shares) |  |  |  |  |  |  |  |  |  |  | 386,614 | 107,660 |
Weighted average remaining contractual life of outstanding share options | year |  |  |  |  |  |  |  |  |  |  | 2.35 | 2.92 |
Weighted average fair value of options granted (in USD per share) | $ |  |  |  |  |  |  |  |  |  |  | $ 9.82 | $ 9.39 |
LTiP |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  |  | 139,800 | 95,140 | 46,800 | 201,870 |  | 306,200 |  |  |
Director EIP |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted (in shares) | 21,814 | 12,520 | 15,943 | 12,517 |  |  |  |  |  |  |  |  |
Director EIP | RSU |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  |  |  |  |  |  | 1,924 | 9,252 |  |  |
Vested immediately |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  |  |  |  |  | 40.00% |  |
Vest upon first, second and third anniversary of IPO |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |

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