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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reinsurance Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct premiums written |  |  |  |  |  |  |  |  | $ 954,617 | $ 883,409 | $ 789,577
Ceded premiums written |  |  |  |  |  |  |  |  | (298,523) | (256,961) | (399,730)
Net premiums written |  |  |  |  |  |  |  |  | 656,094 | 626,448 | 389,847
Direct Premiums Earned |  |  |  |  |  |  |  |  | 921,227 | 836,792 | 777,317
Ceded premium earned |  |  |  |  |  |  |  |  | (288,811) | (332,793) | (450,440)
Premiums earned, net | $ 163,973 | $ 159,534 | $ 156,461 | $ 152,448 | $ 150,598 | $ 146,153 | $ 112,888 | $ 94,360 | 632,416 | 503,999 | 326,877
Direct Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 303,036 | 214,491 | 199,181
Ceded Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | (1,807) | (26,752) | (75,906)
Net Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | $ 301,229 | $ 187,739 | $ 123,275

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