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Subsequent Events - Additional Information (Detail) (Subsequent Events, Global Indemnity Group Inc, American Reliable Insurance Company, USD $) In Millions, unless otherwise specified | 0 Months Ended |
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Oct. 16, 2014 | Oct. 16, 2014
Subsequent Events | Global Indemnity Group Inc | American Reliable Insurance Company |  |
Subsequent Event [Line Items] |  |
Aggregate purchase price |  | $ 113.7
Date entered into the Stock Purchase Agreement | Oct. 16, 2014 |

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- Definition Pending Purchase Price + References No definition available. + Details
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Namespace Prefix: | gbli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration