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Subsequent Events - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 10, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Subsequent Event [Line Items] |  |  |  |  |
Direct Losses and Loss Adjustment Expenses |  | $ 270,158,000 | $ 531,268,000 | $ 593,419,000 | $ 687,707,000
Losses and loss adjustment expenses |  | $ 85,947,000 | $ 116,375,000 | $ 251,715,000 | $ 267,129,000
Hurricane Michael [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Losses and loss adjustment expenses | $ 35,000,000 |  |  |  |
Hurricane Michael [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Direct Losses and Loss Adjustment Expenses | 300,000,000 |  |  |  |
Hurricane Michael [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Direct Losses and Loss Adjustment Expenses | $ 350,000,000 |  |  |  |

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- Definition Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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