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Subsequent Events - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Nov. 02, 2016 Claim
Subsequent Event [Line Items] |  |  |  |  |  |
Incurred (recovered) related to current year |  | $ 73,701,000 | $ 54,014,000 | $ 199,886,000 | $ 127,211,000 |
Hurricane Mathew [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of claims reported | Claim |  |  |  |  |  | 5,657
Hurricane Mathew [Member] | Scenario Forecast [Member] | Minimum [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Incurred (recovered) related to current year | $ 14,000,000 |  |  |  |  |
Hurricane Mathew [Member] | Scenario Forecast [Member] | Maximum [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Incurred (recovered) related to current year | $ 18,000,000 |  |  |  |  |

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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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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Number of claims reported. + References No definition available. + Details
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- Details
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