Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2021 |
|
| Reinsurance Disclosures [Abstract] | |||||
| Direct premiums written | $ 500,677 | $ 432,984 | $ 1,429,685 | $ 1,271,925 | |
| Ceded premiums written | (23,956) | (124) | (670,339) | (585,413) | |
| Net premiums written | 476,721 | 432,860 | 759,346 | 686,512 | |
| Direct premiums earned | 452,450 | 410,621 | 1,295,858 | 1,178,801 | |
| Ceded premiums earned | (161,819) | (145,967) | (459,102) | (414,670) | |
| Premiums earned, net | 290,631 | 264,654 | 836,756 | 764,131 | |
| Direct losses and loss adjustment expenses | 1,269,344 | 264,068 | 1,724,729 | 777,668 | |
| Ceded losses and loss adjustment expenses | $ (66,000) | (938,900) | (76,487) | (1,008,875) | (278,903) |
| Net Losses and Loss Adjustment Expenses | $ 45,000 | $ 330,444 | $ 187,581 | $ 715,854 | $ 498,765 |
| X | ||||||||||
- Definition Amount of earned premiums ceded to other entities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of written premiums ceded to other entities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|