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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reinsurance Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct premiums written |  |  |  |  |  |  |  |  | $ 1,190,875 | $ 1,055,886 | $ 954,617
Ceded premiums written |  |  |  |  |  |  |  |  | (363,201) | (318,826) | (298,523)
Net premiums written |  |  |  |  |  |  |  |  | 827,674 | 737,060 | 656,094
Direct premiums earned |  |  |  |  |  |  |  |  | 1,121,640 | 999,198 | 921,227
Ceded premiums earned |  |  |  |  |  |  |  |  | (353,258) | (310,405) | (288,811)
Premiums earned, net | $ 204,595 | $ 188,938 | $ 192,272 | $ 182,577 | $ 183,708 | $ 174,517 | $ 169,009 | $ 161,559 | 768,382 | 688,793 | 632,416
Direct Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 1,325,323 | 779,122 | 303,036
Ceded Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | (910,868) | (428,694) | (1,807)
Net Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | $ 414,455 | $ 350,428 | $ 301,229

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