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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Reinsurance Retention Policy [Line Items] |  |
Reinsurance payable, net | $ 424,187 | $ 93,306
June 1, 2019 - May 31, 2020 [Member] |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance payable, net | 117,600 |
June 1, 2020 - May 31, 2021 [Member] |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance payable, net | $ 83,600 |

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- 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=119400593&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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