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Related Party Transactions - Additional Information (Detail) - Oxbridge [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) Directors
Related Party Transaction [Line Items]
Number of non-employee directors | Directors	3
Period from June 1, 2015 through May 31, 2016 [Member]
Related Party Transaction [Line Items]
Assumed total covered exposure	$ 11,600
Transaction amount	3,340
Period From June 1, 2016 Through May 31, 2017 [Member]
Related Party Transaction [Line Items]
Assumed total covered exposure	6,000
Premiums paid	$ 3,400

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Number of non-employee directors who are shareholders or members of the entity participating in related party transactions.

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- Definition

Cash payments made for reinsurance during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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-Name Accounting Standards Codification
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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-Name Accounting Standards Codification
-Topic 850
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

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