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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reinsurance Disclosures [Abstract] |  |  |  |
Direct premiums written | $ 409,418 | $ 342,872 | $ 1,148,656 | $ 990,066
Ceded premiums written | (3,062) | (4,781) | (497,263) | (422,414)
Net premiums written | 406,356 | 338,091 | 651,393 | 567,652
Direct premiums earned | 357,208 | 313,065 | 1,020,798 | 911,550
Ceded premiums earned | (123,017) | (106,466) | (339,408) | (284,867)
Premiums earned, net | 234,191 | 206,599 | 681,390 | 626,683
Direct losses and loss adjustment expenses | 347,207 | 334,440 | 682,896 | 663,768
Ceded losses and loss adjustment expenses | (108,730) | (201,869) | (158,026) | (304,807)
Net Losses and Loss Adjustment Expenses | $ 238,477 | $ 132,571 | $ 524,870 | $ 358,961

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