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Share-based compensation - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 30, 2011
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accumulated compensation expense   $ 0 $ 0 $ 0
2011 equity incentive plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of total outstanding shares of the entity immediately follow the IPO that is authorized under equity incentive plan 2.50%      
Share-based compensation expense   27 129 327
Related income tax (expense) benefit   2,763 966 75
Restricted share units | 2011 equity incentive plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of share units   514 1,026 1,773
Phantom RSU award | Phantom RSU award plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 15,586 $ 7,448 $ 3,452
Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued during the period (in shares)   60,424 116,223 251,623
Number of shares pending issuance in connection with partial vesting (in shares)   8,084    
Value of shares pending for issuance in connection with partial vesting   $ 59    
Common stock | Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued during the period (in shares)   60,424 116,223 251,623
Accumulated compensation expense   $ 514 $ 1,024 $ 1,766
Second anniversary of grant date | Restricted share units | 2011 equity incentive plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   40.00%    
Third anniversary of grant date | Restricted share units | 2011 equity incentive plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   20.00%    
Fourth anniversary of grant date | Restricted share units | 2011 equity incentive plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   20.00%    
Fifth anniversary of grant date | Restricted share units | 2011 equity incentive plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   20.00%