Schedule of Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Revenues:
Net premiums earned		$ 122,089	$ 108,002
Net investment income		7,219	11,404
Net realized investment gains (losses)		10,390	(316)
Other income (loss)		488	554
Total revenues		140,186	119,644
Losses and Expenses:
Net losses and loss adjustment expenses		58,321	56,072
Acquisition costs and other underwriting expenses		49,743	45,003
Corporate and other operating expenses		3,205	9,260
Interest expense		5,023	4,861
Income before income taxes		23,894	4,448
Equity in net income (loss) of subsidiaries		0	0
Income (loss) before income taxes		23,894	4,448
Income tax expense (benefit)		4,294	(1,253)
Net income		19,600	5,701
Global Indemnity Limited (Parent co-obligor)
Revenues:
Net premiums earned		0	0
Net investment income		642	132
Net realized investment gains (losses)		(7)	0
Other income (loss)		0	0
Total revenues		635	132
Losses and Expenses:
Net losses and loss adjustment expenses		0	0
Acquisition costs and other underwriting expenses		0	0
Corporate and other operating expenses		1,329	4,258
Interest expense		274	5,319
Income before income taxes		(968)	(9,445)
Equity in net income (loss) of subsidiaries		20,568	15,146
Income (loss) before income taxes		19,600	5,701
Income tax expense (benefit)		0	0
Net income		19,600	5,701
Global Indemnity Group, Inc.(Subsidiary co-obligor)
Revenues:
Net premiums earned		0	0
Net investment income		(2,075)	3,201
Net realized investment gains (losses)		12,076	(220)
Other income (loss)		28	(2)
Total revenues		10,029	2,979
Losses and Expenses:
Net losses and loss adjustment expenses		0	0
Acquisition costs and other underwriting expenses		0	0
Corporate and other operating expenses		1,566	4,718
Interest expense		4,957	11,020
Income before income taxes		3,506	(12,759)
Equity in net income (loss) of subsidiaries		7,893	7,657
Income (loss) before income taxes		11,399	(5,102)
Income tax expense (benefit)		1,340	1,365
Net income		10,059	(6,467)
Other Global Indemnity Limited Subsidiaries and Eliminations (non-co-obligor subsidiaries)
Revenues:
Net premiums earned	[1]	122,089	108,002
Net investment income	[1]	8,939	19,624
Net realized investment gains (losses)	[1]	(1,679)	(96)
Other income (loss)	[1]	460	556
Total revenues	[1]	129,809	128,086
Losses and Expenses:
Net losses and loss adjustment expenses	[1]	58,321	56,072
Acquisition costs and other underwriting expenses	[1]	49,743	45,003
Corporate and other operating expenses	[1]	310	284
Interest expense	[1]	79	75
Income before income taxes	[1]	21,356	26,652
Equity in net income (loss) of subsidiaries	[1]	10,059	(6,467)
Income (loss) before income taxes	[1]	31,415	20,185
Income tax expense (benefit)	[1]	2,954	(2,618)
Net income	[1]	28,461	22,803
Consolidation Adjustments
Revenues:
Net premiums earned	[2]	0	0
Net investment income	[2]	(287)	(11,553)
Net realized investment gains (losses)	[2]	0	0
Other income (loss)	[2]	0	0
Total revenues	[2]	(287)	(11,553)
Losses and Expenses:
Net losses and loss adjustment expenses	[2]	0	0
Acquisition costs and other underwriting expenses	[2]	0	0
Corporate and other operating expenses	[2]	0	0
Interest expense	[2]	(287)	(11,553)
Income before income taxes	[2]	0	0
Equity in net income (loss) of subsidiaries	[2]	(38,520)	(16,336)
Income (loss) before income taxes	[2]	(38,520)	(16,336)
Income tax expense (benefit)	[2]	0	0
Net income	[2]	$ (38,520)	$ (16,336)

[1] Includes all other subsidiaries of Global Indemnity Limited and eliminations

[2] Includes Parent co-obligor and subsidiary co-obligor consolidating adjustments