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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reinsurance Disclosures [Abstract] |  |  |  |
Direct premiums written | $ 342,872 | $ 309,176 | $ 990,066 | $ 921,941
Ceded premiums written | (4,781) | (17,256) | (422,414) | (356,507)
Net premiums written | 338,091 | 291,920 | 567,652 | 565,434
Direct premiums earned | 313,065 | 288,404 | 911,550 | 824,692
Ceded premiums earned | (106,466) | (99,466) | (284,867) | (260,905)
Premiums earned, net | 206,599 | 188,938 | 626,683 | 563,787
Direct losses and loss adjustment expenses | 334,440 | 270,158 | 663,768 | 593,419
Ceded Losses and Loss Adjustment Expenses | (201,869) | (184,211) | (304,807) | (341,704)
Net Losses and Loss Adjustment Expenses | $ 132,571 | $ 85,947 | $ 358,961 | $ 251,715

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