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Insurance Operations - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statutory Accounting Practices [Line Items] |  |  |
Insurance entities combined net income | $ 35,600,000 | $ 58,200,000 | $ 53,600,000
UPCIC [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Ordinary dividend capacity accordance with Florida Insurance Code | 36,200,000 |  |
Dividend paid to immediate parent company | 30,000,000 | 0 | 0
APPCIC [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividend paid to immediate parent company | $ 0 | $ 0 | $ 0
UPCIC and APPCIC [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Minimum capitalization rate | 10.00% |  |
Minimum capitalization amount | $ 10,000,000 |  |
Minimum capital required | Greater of ten percent of the insurer’s total liabilities but not less than $10.0 million. |  |

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- Definition For insurance companies, a description of the minimum regulatory capital requirements imposed by state insurance regulators, and restrictions on dividend payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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