Share-based compensation - Summary of Phantom RSU Award Activity (Details) - Phantom RSU award - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Phantom RSU award plan
Units
Units, beginning balance (in shares)	3,200,187	2,711,755	2,040,488
Forfeitures (in shares)	(5,139)	(180,272)	(128,919)
Units, ending balance (in shares)	2,178,314	3,200,187	2,711,755
Nonvested
Number of unites outstanding (in shares)	2,178,314
Current share price (in dollars per share)	$ 7.28
Total fair value of the plan	$ 15,858
Weighted-average accumulated percentage of service	57.63%
Accrued liability	$ 9,139
Compensation expense not yet recognized	$ 6,719
Weighted-average period for recognition	1 year 9 months 18 days
2019
Units
Vesting and partial vesting (in shares)	(943,288)	(59,616)	(63,257)
Settlement
Partial vesting grant in value	$ 10,480	$ 512	$ 431
2021
Units
Vesting and partial vesting (in shares)	(692,422)		(44,093)
Settlement
Partial vesting grant in value	$ 7,693
Vesting grant in value			$ 320
2022
Units
Grant (in shares)		795,013	907,536
Vesting and partial vesting (in shares)	(32,599)	(41,055)
Settlement
Vesting grant in value	$ 351	$ 326
2023
Units
Grant (in shares)	733,972	769,375
2024
Units
Grant (in shares)	651,575

Compensation expense related to non-vested units that will be recognized in future awards.

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Settlement Value

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Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested

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- Definition

Fair value of outstanding units already vested related to stock options plan.

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As of the balance sheet date, the number of vested unit related to stock options plan.

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As of the balance sheet date, the weighted-average fair market value of outstanding units that are fully vested.

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Unit Based Compensation Arrangement By Unit Based Payment Award Vesting Granted In Value

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- Definition

As of the balance sheet date weighted-average accumulated percentage of service rendered by employees for both vested and non-vested outstanding units.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 710
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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