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Commitments and Contingencies - Additional Information (Detail) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Reinsurance Retention Policy [Line Items]
Reinsurance payable, net	$ 261,133,000	$ 110,381,000
Period from June 1, 2019 to May 31, 2020 [Member]
Reinsurance Retention Policy [Line Items]
Reinsurance payable, net	82,300
Period from June 1, 2020 to May 31, 2021 [Member]
Reinsurance Retention Policy [Line Items]
Reinsurance payable, net	$ 33,900

X

- Definition

The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.13(a)(3),(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Period Type:	instant

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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- Details

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- Details

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