Condensed Financial Information of Registrant (Parent Only) Balance Sheets (Detail) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Available for sale, at fair value (amortized cost: $1,322,092 and $1,301,723; net of allowance for expected credit losses of: $0 at December 31, 2023 and 2022		$ 1,293,793	$ 1,248,198
Equity securities, at fair value		16,508	17,520
Other invested assets		38,236	38,176
Total investments		1,348,537	1,303,894
Cash and cash equivalents		38,037	38,846
Receivable for securities sold		3,858	0
Other assets		26,362	23,597
Total assets		1,729,576	1,800,775	$ 2,012,809
Liabilities:
Payable for securities		0	66
Other liabilities		24,770	30,965
Total liabilities		1,080,823	1,174,546
Commitments and contingencies (Note 17)
Shareholders’ equity:
Common shares: no par value; 900,000,000 common shares authorized; class A common shares issued: 11,042,670 and 10,876,041, respectively; class A common shares outstanding: 9,771,429 and 10,073,660, respectively; class B common shares issued and outstanding: 3,793,612 and 3,793,612, respectively		0	0
Additional paid-in capital		454,791	451,305
Accumulated other comprehensive income (loss), net of tax		(22,863)	(43,058)	6,404
Retained earnings		244,988	233,468
Total shareholders’ equity		648,753	626,229	$ 706,621
Total liabilities and shareholders’ equity		1,729,576	1,800,775
Series A Cumulative Fixed Rate Preferred Shares
Shareholders’ equity:
Series A cumulative fixed rate preferred shares, $1,000 par value; 100,000,000 shares authorized, shares issued and outstanding: 4,000 and 4,000 shares, respectively, liquidation preference: $1,000 per share and $1,000 per share, respectively		4,000	4,000
Class A Common Shares
Shareholders’ equity:
Class A common shares in treasury, at cost: 1,271,241 and 802,381 shares, respectively		(32,163)	(19,486)
Parent Company | Global Indemnity Group LLC
ASSETS
Available for sale, at fair value (amortized cost: $1,322,092 and $1,301,723; net of allowance for expected credit losses of: $0 at December 31, 2023 and 2022		70,464	86,310
Equity securities, at fair value		436	1,694
Other invested assets		26,016	23,573
Total investments		96,916	111,577
Cash and cash equivalents		40	4,775
Intercompany note receivable	[1]	69,400	69,400
Accrued interest receivable		1,501	627
Equity in unconsolidated subsidiaries	[1]	482,653	444,517
Other assets		997	1,130
Total assets		651,507	632,026
Liabilities:
Payable for securities		0	49
Due to affiliates	[1]	2,411	4,623
Other liabilities		343	1,125
Total liabilities		2,754	5,797
Commitments and contingencies (Note 17)		0	0
Shareholders’ equity:
Series A cumulative fixed rate preferred shares, $1,000 par value; 100,000,000 shares authorized, shares issued and outstanding: 4,000 and 4,000 shares, respectively, liquidation preference: $1,000 per share and $1,000 per share, respectively		4,000	4,000
Common shares: no par value; 900,000,000 common shares authorized; class A common shares issued: 11,042,670 and 10,876,041, respectively; class A common shares outstanding: 9,771,429 and 10,073,660, respectively; class B common shares issued and outstanding: 3,793,612 and 3,793,612, respectively		0	0
Additional paid-in capital		454,791	451,305
Accumulated other comprehensive income (loss), net of tax		(22,863)	(43,058)
Retained earnings		244,988	233,468
Total shareholders’ equity		648,753	626,229
Total liabilities and shareholders’ equity		651,507	632,026
Parent Company | Global Indemnity Group LLC | Class A Common Shares
Shareholders’ equity:
Class A common shares in treasury, at cost: 1,271,241 and 802,381 shares, respectively		$ (32,163)	$ (19,486)

[1] (1) This item has been eliminated in the Company’s Consolidated Financial Statements.