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Equity and dividends (Additional Information) (Details) - USD ($) |  |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 12, 2021 | Dec. 08, 2020 | Feb. 17, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |  |  |  |  |
Preferred shares issued |  |  |  | 0 |  |
Common stock consideration fair value |  |  |  | $ 1,459,000 |  |
Unrecognized share based continuing employment costs, weighted average period for recognition |  |  |  | 2 years |  |
Stock repurchased during period, shares |  |  |  | 1,525,312 | 1,223,674 | 0
Stock repurchased during period, value |  |  |  | $ 53,170,000 | $ 42,012,000 |
Dividends declared (usd per share) | $ 0.22 |  |  |  |  |
Dividends payable date |  |  |  | Mar. 05, 2021 |  |
Dividends, date of record |  |  |  | Feb. 12, 2021 |  |
Dividends, common stock | $ 24,180,000 |  |  |  |  |
Gain (Loss) from intra-entity foreign currency transactions |  |  |  | $ 10,826,000 | $ (1,082,000) | $ 9,602,000
Rouse Services LLC [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Common shares issued (in shares) |  | 312,193 |  |  |  |
Vesting period |  | 3 years |  |  |  |
Common stock consideration fair value |  | $ 1,459,000 |  |  |  |
Fair value of common shares (per share) |  | $ 71.09 |  |  |  |
Unrecognized share based continuing employment costs |  |  |  | $ 19,933,000 |  |
Number of common shares restrictions have not yet lapse |  |  |  | 312,193 |  |
Rouse Services LLC [Member] | Subsequent Events [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Common stock consideration fair value |  |  | $ 17,931,000 |  |  |
Unrecognized share based continuing employment costs |  |  | $ 17,225,000 |  |  |
Shares forfeited |  |  | 55,510 |  |  |

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