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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Mar. 08, 2018	Mar. 31, 2018	Mar. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		$ (5,927)	$ (10,130)
Commercial Lines Segment
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(2,700)	(5,300)
Commercial Lines Segment | Property Lines | Accident Year 2016 | Catastrophe segment
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(1,700)
Commercial Lines Segment | Property Lines | Accident Years 2015 through 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(400)
Commercial Lines Segment | General Liability | Accident Years 2007 Through 2013 | Non Construction Defect
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(4,000)
Commercial Lines Segment | General Liability | Accident Years 2004 through 2014 and 2015 through 2017 | Non Construction Defect
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(1,400)
Commercial Lines Segment | Commercial Auto Liability | Accident years 2010 through 2012
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(1,000)
Personal Lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(1,100)	(3,200)
Personal Lines | Property Lines | Accident Year 2016
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(2,700)
Personal Lines | Property Lines | Accident Years 2015 through 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(900)
Personal Lines | General Liability | Accident Year 2016 | Agriculture Reserve
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(500)
Reinsurance Operations
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(2,100)	(1,700)
Reinsurance Operations | Property Lines | Accident Years 2013 Through 2015
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			$ (1,700)
Reinsurance Operations | Property Lines | Accident Years 2013 through 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		$ (2,100)
Global Indemnity Group Inc | American Reliable Insurance Company
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Reserve Settlement	$ 41,500
Proceeds for loss and loss adjustment expenses paid	38,800
Proceeds for accrued interest	6,200
Payment for the difference between the agreed upon purchase price and actual settlement	$ 3,500

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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