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Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | $ 1,180,860 | $ 1,161,336
Intangible assets with a finite life, accumulated amortization | (489,828) | (419,294)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 1,831 | (3,959)
Goodwill and intangible assets, net balance | 692,863 | 738,083
Intangible liability - unfavorable service contract |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | (9,533) | (9,533)
Intangible assets with a finite life, accumulated amortization | 9,147 | 8,657
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0
Goodwill and intangible assets, net balance | (386) | (876)
Intangible assets with a finite life |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Intangible assets with a finite life, accumulated amortization | (489,828) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 3,922 |
Intangible assets with a finite life | Acquired insurance contracts |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 451,505 | 452,470
Intangible assets with a finite life, accumulated amortization | (381,349) | (336,559)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 284 | 310
Goodwill and intangible assets, net balance | 70,440 | 116,221
Intangible assets with a finite life | Operating platform |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 52,674 | 52,674
Intangible assets with a finite life, accumulated amortization | (44,347) | (39,571)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 60 | (259)
Goodwill and intangible assets, net balance | 8,387 | 12,844
Intangible assets with a finite life | Distribution relationships |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 285,141 | 243,838
Intangible assets with a finite life, accumulated amortization | (71,383) | (50,542)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 3,450 | 212
Goodwill and intangible assets, net balance | 217,208 | 193,508
Intangible assets with a finite life | Other |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 5,134 | 5,134
Intangible assets with a finite life, accumulated amortization | (1,896) | (1,279)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 127 | 70
Goodwill and intangible assets, net balance | 3,365 | 3,925
Goodwill |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 318,043 | 331,448
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (3,414) | (4,897)
Goodwill and intangible assets, net balance | 314,629 | 326,551
Intangible assets with an indefinite life |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 1,323 |
Intangible assets with an indefinite life | Insurance licenses |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 55,981 | 63,390
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0
Goodwill and intangible assets, net balance | 55,981 | 63,390
Intangible assets with an indefinite life | Syndicate capacity |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |
Gross balance | 21,915 | 21,915
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 1,324 | 605
Goodwill and intangible assets, net balance | $ 23,239 | $ 22,520

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