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Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Insurance [Abstract] |  |  |
Direct business | $ 573,412 | $ 584,467 | $ 554,617
Reinsurance assumed | 154,191 | 97,655 | 51,986
Reinsurance ceded | (136,272) | (102,054) | (58,436)
Net written premiums | 591,331 | 580,068 | 548,167
Direct business | 589,131 | 578,171 | 560,658
Reinsurance assumed | 135,896 | 78,880 | 69,312
Reinsurance ceded | (122,556) | (61,441) | (62,271)
Net earned premiums | $ 602,471 | $ 595,610 | $ 567,699

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