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Reinsurance - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Effects of Reinsurance [Line Items]
Reinsurance unsecured amounts due from reinsurers	$ 0	$ 180,172,000
Stockholders' Equity, Total [Member] | Amounts Due From Reinsurers [Member]
Effects of Reinsurance [Line Items]
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity	3.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

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X

- 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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X

- Definition

Represents total unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of stockholders' equity as of the reporting date.

+ References

No definition available.

+ Details

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- Details

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- Details

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