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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reinsurance Disclosures [Abstract] |  |  |  |
Direct premiums written | $ 432,984 | $ 409,418 | $ 1,271,925 | $ 1,148,656
Ceded premiums written | (124) | (3,062) | (585,413) | (497,263)
Net premiums written | 432,860 | 406,356 | 686,512 | 651,393
Direct premiums earned | 410,621 | 357,208 | 1,178,801 | 1,020,798
Ceded premiums earned | (145,967) | (123,017) | (414,670) | (339,408)
Premiums earned, net | 264,654 | 234,191 | 764,131 | 681,390
Direct losses and loss adjustment expenses | 264,068 | 347,207 | 777,668 | 682,896
Ceded losses and loss adjustment expenses | (76,487) | (108,730) | (278,903) | (158,026)
Net Losses and Loss Adjustment Expenses | $ 187,581 | $ 238,477 | $ 498,765 | $ 524,870

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