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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reinsurance Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct premiums written |  |  |  |  |  |  |  |  | $ 1,055,886 | $ 954,617 | $ 883,409
Ceded premiums written |  |  |  |  |  |  |  |  | (318,826) | (298,523) | (256,961)
Net premiums written |  |  |  |  |  |  |  |  | 737,060 | 656,094 | 626,448
Direct premiums earned |  |  |  |  |  |  |  |  | 999,198 | 921,227 | 836,792
Ceded premiums earned |  |  |  |  |  |  |  |  | (310,405) | (288,811) | (332,793)
Premiums earned, net | $ 183,708 | $ 174,517 | $ 169,009 | $ 161,559 | $ 163,973 | $ 159,534 | $ 156,461 | $ 152,448 | 688,793 | 632,416 | 503,999
Direct Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 779,122 | 303,036 | 214,491
Ceded Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | (428,694) | (1,807) | (26,752)
Net Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | $ 350,428 | $ 301,229 | $ 187,739

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