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Related Party Transactions - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |
Distribution received from the limited partnership |  |  |  | $ 4,287,000 |  |
Fox Paine & Company, LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Company's total outstanding voting power |  | 93.00% |  | 93.00% |  |
Minimum voting power required to nominate Directors |  | 25.00% |  | 25.00% |  |
Management fees |  | $ 500,000 | $ 500,000 | $ 1,000,000 | $ 1,000,000 |
Unpaid management fees |  | 1,600,000 |  | 1,600,000 |  | $ 600,000
Fox Paine & Company, LLC | Global Indemnity Group Inc | American Reliable Insurance Company |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment bank fee as a percentage of the amount paid plus required capital to operate American Reliable on a standalone basis | 3.00% |  |  |  |  |
Investment advisory fee | $ 1,500,000 |  |  |  |  |
Investment advisory fee | $ 6,500,000 |  |  |  |  |
Ordinary shares of Global Indemnity issued to pay fees | 267,702 |  |  |  |  |
Fox Paine Capital Fund II Limited Partner | Global Indemnity Reinsurance |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Company's investment in limited partnership |  | 3,300,000 |  | 3,300,000 |  | $ 3,400,000
Unfunded capital commitment |  | 2,400,000 |  | 2,400,000 |  |
Distribution received from the limited partnership |  | 0 | 0 | 800,000 | 0 |
Cozen O'Connor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cost incurred for legal services rendered |  | 200,000 | 60,000 | 300,000 | 90,000 |
Crystal & Company |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Brokerage fee incurred |  | $ 60,000 | $ 60,000 | $ 100,000 | $ 100,000 |

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