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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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