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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reinsurance Disclosures [Abstract] |  |  |  |
Direct premiums written | $ 309,176 | $ 274,744 | $ 921,941 | $ 816,350
Ceded premiums written | (17,256) | (7,303) | (356,507) | (318,827)
Net premiums written | 291,920 | 267,441 | 565,434 | 497,523
Direct premiums earned | 288,404 | 254,809 | 824,692 | 735,807
Ceded premiums earned | (99,466) | (80,292) | (260,905) | (230,722)
Premiums earned, net | 188,938 | 174,517 | 563,787 | 505,085
Direct Losses and Loss Adjustment Expenses | 270,158 | 531,268 | 593,419 | 687,707
Ceded Losses and Loss Adjustment Expenses | (184,211) | (414,893) | (341,704) | (420,578)
Net Losses and Loss Adjustment Expenses | $ 85,947 | $ 116,375 | $ 251,715 | $ 267,129

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