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Related Party Transactions - Additional Information (Detail) - Oxbridge [Member] $ in Thousands | 9 Months Ended
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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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