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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) $ in Thousands | Dec. 31, 2016 USD ($) Claim | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 753,716 |  |  |  |
Accident Year 2012 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 95,727 | $ 99,517 | $ 101,888 | $ 102,118 | $ 109,073
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (3,399) |  |  |  |
Cumulative Number of Reported Claims | Claim | 24,272 |  |  |  |
Accident Year 2013 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 88,493 | 96,012 | 96,993 | $ 100,111 |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (7,650) |  |  |  |
Cumulative Number of Reported Claims | Claim | 20,415 |  |  |  |
Accident Year 2014 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 112,251 | 118,289 | $ 111,739 |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (9,947) |  |  |  |
Cumulative Number of Reported Claims | Claim | 22,347 |  |  |  |
Accident Year 2015 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 187,431 | $ 170,381 |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (10,114) |  |  |  |
Cumulative Number of Reported Claims | Claim | 26,502 |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 269,814 |  |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 13,321 |  |  |  |
Cumulative Number of Reported Claims | Claim | 35,690 |  |  |  |

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