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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reinsurance Disclosures [Abstract] |  |  |  |
Direct premiums written | $ 342,781 | $ 296,191 | $ 612,765 | $ 541,606
Ceded premiums written | (339,251) | (311,338) | (339,251) | (311,524)
Net premiums written | 3,530 | (15,147) | 273,514 | 230,082
Direct premiums earned | 274,027 | 244,623 | 536,288 | 480,998
Ceded premiums earned | (81,755) | (75,614) | (161,439) | (150,430)
Premiums earned, net | 192,272 | 169,009 | 374,849 | 330,568
Direct Losses and Loss Adjustment Expenses | 246,622 | 85,656 | 323,261 | 156,439
Ceded Losses and Loss Adjustment Expenses | (156,780) | (5,472) | (157,493) | (5,685)
Net Losses and Loss Adjustment Expenses | $ 89,842 | $ 80,184 | $ 165,768 | $ 150,754

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