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Losses and Loss Adjustment Reserve - Effects of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Written |  |
Direct premiums | $ 604,623 | $ 591,142
Assumed premiums | 0 | 0
Ceded premiums | 604,610 | 591,124
Net premiums | 13 | 18
Earned |  |
Direct premiums | 592,267 | 592,123
Assumed premiums | 0 | 0
Ceded premiums | 592,254 | 592,105
Net premiums | $ 13 | $ 18

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