Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	GLOBAL INDEMNITY GROUP, LLC
Entity Central Index Key	0001494904
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-34809
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-2619578
Entity Address, Address Line One	Three Bala Plaza East
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Bala Cynwyd
Entity Address, Country	PA
Entity Address, Postal Zip Code	19004
City Area Code	610
Local Phone Number	664-1500
Class A Common Shares
Document Information [Line Items]
Entity Ordinary Shares, Shares Outstanding		10,479,999
Title of each class	Class A Common Shares
Trading Symbol	GBLI
Name of each exchange on which registered	NASDAQ
Class B Common Shares
Document Information [Line Items]
Entity Ordinary Shares, Shares Outstanding		3,947,206
7.875% Subordinated Notes due 2047
Document Information [Line Items]
Title of each class	7.875% Subordinated Notes due 2047
Trading Symbol	GBLIL
Name of each exchange on which registered	NASDAQ