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Statutory Net Income, Capital and Surplus and Dividend Restrictions - Additional Information (Detail) $ in Millions	Dec. 31, 2019 USD ($)
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	$ 39.9
Atlantic States [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	25.9
Southern [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	5.4
Peninsula [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	2.0
MICO [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	$ 6.6

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of dividends available for payment after computation of statutory restrictions on capital surplus.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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