Condensed Financial Information of Registrant (Parent Only) Balance Sheets (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0	$ 0
Ordinary shares, shares authorized	900,000,000	900,000,000
Global Indemnity Group LLC | Parent Company
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0	$ 0
Ordinary shares, shares authorized	900,000,000	900,000,000
Class A Common Shares
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares issued	11,042,670	10,876,041
Ordinary shares, shares outstanding	9,771,429	10,073,660
Treasury shares, shares	1,271,241	802,381
Class A Common Shares | Global Indemnity Group LLC | Parent Company
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares issued	11,042,670	10,876,041
Ordinary shares, shares outstanding	9,771,429	10,073,660
Treasury shares, shares	1,271,241	802,381
Class B Common Shares
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares issued	3,793,612	3,793,612
Ordinary shares, shares outstanding	3,793,612	3,793,612
Class B Common Shares | Global Indemnity Group LLC | Parent Company
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares issued	3,793,612	3,793,612
Ordinary shares, shares outstanding	3,793,612	3,793,612
Series A Cumulative Fixed Rate Preferred Shares
Condensed Financial Statements, Captions [Line Items]
Preferred shares, par value	$ 1,000	$ 1,000
Preferred shares, shares authorized	100,000,000	100,000,000
Preferred shares, shares issued	4,000	4,000
Preferred shares, shares outstanding	4,000	4,000
Preferred shares, liquidation preference	$ 1,000	$ 1,000
Series A Cumulative Fixed Rate Preferred Shares | Global Indemnity Group LLC | Parent Company
Condensed Financial Statements, Captions [Line Items]
Preferred shares, par value	$ 1,000	$ 1,000
Preferred shares, shares authorized	100,000,000	100,000,000
Preferred shares, shares issued	4,000	4,000
Preferred shares, shares outstanding	4,000	4,000
Preferred shares, liquidation preference	$ 1,000	$ 1,000