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Reinsurance - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) Reinsurers | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) Reinsurers | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Reinsurers | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Reinsurers
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |
Number of reinsurers | Reinsurers | 35 |  | 35 |  | 35 |  | 21
Reinsurance recoverable | $ 0 |  | $ 0 | $ 0 | $ 0 | $ 0 |
Credit risk associated with reinsurance receivables | 0 |  | 0 |  | 0 |  | $ 0
Recoveries pertaining to reinsurance contracts |  |  |  |  | 0 |  | 0
Net reduction in ceded premiums |  |  | 3,428,000 | 2,901,000 | 9,250,000 | 15,515,000 |
Amount received from retrospective reinsurance contracts | 5,716,000 | $ 37,800,000 |  |  |  |  |
Other assets | 7,358,000 |  | 7,358,000 |  | 7,358,000 |  | 39,128,000
Prepaid reinsurance premiums | 29,699,000 |  | 29,699,000 |  | 29,699,000 |  | 40,747,000
Oxbridge [Member] |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |
Net reduction in ceded premiums |  |  | 594,000 | $ 336,000 | 1,334,000 | $ 2,461,000 |
Amount received from retrospective reinsurance contracts |  | $ 7,560,000 |  |  |  |  |
Reinsurance [Member] |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |
Other assets | 3,320,000 |  | 3,320,000 |  | 3,320,000 |  | 36,176,000
Prepaid reinsurance premiums | $ 1,214,000 |  | $ 1,214,000 |  | $ 1,214,000 |  | $ 2,625,000

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- Definition Net reduction to ceded premium resulting from reinsurance adjustments. + References No definition available. + Details
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