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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |
Distribution received from the limited partnership |  |  |  | $ 4,287 |  |
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 |  | $ 400 | $ 500 | $ 1,400 | $ 1,500 |
Unpaid management fees |  | 2,100 |  | 2,100 |  | $ 600
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 |  |  |  |  |
Aggregate investment advisory fee | $ 6,500 |  |  |  |  |
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 |  | 3,300 |  | $ 3,400
Unfunded capital commitment |  | 2,400 |  | 2,400 |  |
Distribution received from the limited partnership |  | 0 | 0 | 800 | 0 |
Cozen O'Connor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cost incurred for legal services rendered |  | 200 | 20 | 600 | 100 |
Crystal & Company |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Brokerage fee incurred |  | $ 100 | $ 100 | $ 200 | $ 200 |

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