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Acquisition - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Jan. 01, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Agent
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Apr. 30, 2015
USD ($)
Business Acquisition [Line Items]                  
Revenue   $ 124,060 $ 75,839 $ 402,347 $ 264,752        
Pre-tax (loss)   (9,727) $ 8,128 3,283 $ 59,900        
Goodwill   6,936   $ 6,936   $ 4,820 $ 6,936    
Intangible assets $ 32,000                
Intangible assets arising from acquisition deductible for income tax, period       15 years          
Business combination, employee related compensation cost paid, which were included in the fair value of net assets acquired       $ 1,600          
Dividend limitations       The maximum amount of dividends, which can be paid by Arizona domiciled insurance companies without prior approval of the Insurance Commissioner, is subject to certain regulatory restrictions relating to statutory surplus.Specifically, an insurance company may pay dividends equal to the lesser of net income or 10% of its statutory surplus without specific approval from the Insurance Commissioner. At December 31, 2014, the maximum dividend, which may be distributed without approval in 2015, is zero. Dividends in excess of this amount are considered extraordinary.          
Estimated project cost from Unrelated Party                 $ 2,600
American Reliable Insurance Company                  
Business Acquisition [Line Items]                  
Revenue   63,500   $ 196,100          
Pre-tax (loss)   11,200   8,500          
Assets, Fair Value Adjustment   (4,806)              
Goodwill   2,116   2,116     2,116 $ 2,314  
Intangible assets   32,000   32,000     $ 32,000 $ 32,000  
Amortization of definite lived intangible assets   4,100   23,000          
Ceded written premiums   (24,047)   (52,779)          
Ceded earned premiums   (18,620)   (61,499)          
Rental expense under operating leases, net of sub-lease income   300   800          
American Reliable Insurance Company | American Bankers Insurance Company                  
Business Acquisition [Line Items]                  
Ceded written premiums   18,700   41,700          
Ceded earned premiums   13,300   50,800          
American Reliable Insurance Company | Various Reinsurers Owned by Assurant, Inc.                  
Business Acquisition [Line Items]                  
Ceded written premiums   21,400   69,300          
Ceded earned premiums   22,800   69,800          
American Reliable Insurance Company | Earthquake Property Catastrophe Excess Of Loss                  
Business Acquisition [Line Items]                  
Reinsurance coverage for excess of risk retention per incident, effective treaty       30,000          
Reinsurance coverage for risk retention per incident, effective treaty       $ 5,000          
Reinsurance percentage of one full reinstatement, effective treaty       100.00%          
American Reliable Insurance Company | Property Per Risk Excess Of Loss | Reinsurance Program Layer 1                  
Business Acquisition [Line Items]                  
Reinsurance coverage for excess of risk retention per incident, effective treaty       $ 1,000          
Reinsurance coverage for risk retention per incident, effective treaty       1,000          
Limit of liability for risks involved in one loss occurrence       2,000          
American Reliable Insurance Company | Property Per Risk Excess Of Loss | Reinsurance Program Layer 2                  
Business Acquisition [Line Items]                  
Reinsurance coverage for excess of risk retention per incident, effective treaty       3,000          
Reinsurance coverage for risk retention per incident, effective treaty       2,000          
Limit of liability for risks involved in one loss occurrence       $ 6,000          
American Reliable Insurance Company | Accounts Receivable                  
Business Acquisition [Line Items]                  
Assets, Fair Value Adjustment   $ (5,818)              
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk                  
Business Acquisition [Line Items]                  
Gross premiums written, Percent           100.00%      
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | General and Specialty Agents | Arizona and New Mexico                  
Business Acquisition [Line Items]                  
Number of agents | Agent           290      
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | Retail Agents | Arizona and New Mexico                  
Business Acquisition [Line Items]                  
Number of agents | Agent           332      
American Reliable Insurance Company | Sales Revenue, Services, Net | Customer Concentration Risk | Top Five Agents                  
Business Acquisition [Line Items]                  
Gross premiums written, Percent           23.90%      
American Reliable Insurance Company | Sales Revenue, Services, Net | Customer Concentration Risk | Agency                  
Business Acquisition [Line Items]                  
Gross premiums written, Percent           6.80%      
American Bankers Insurance Company                  
Business Acquisition [Line Items]                  
Interest rate on dispute resolution agreement   5.00%   5.00%     5.00%    
American Bankers Insurance Company | Accounts Receivable                  
Business Acquisition [Line Items]                  
Assets, Fair Value Adjustment   $ 6,500              
American Bankers Insurance Company | Interest Receivable                  
Business Acquisition [Line Items]                  
Assets, Fair Value Adjustment   $ 700              
Global Indemnity Group Inc | American Reliable Insurance Company                  
Business Acquisition [Line Items]                  
Aggregate purchase price $ 113,700                
Business acquisition date       Jan. 01, 2015          
Acquired voting equity interest 100.00%                
Customary insurance liabilities, obligations, and mandates $ 283,300                
Estimated purchase price $ 99,800                
Global Indemnity Group Inc | American Reliable Insurance Company | Fox Paine & Company, LLC                  
Business Acquisition [Line Items]                  
Investment bank fee as a percentage of the amount paid plus required capital to operate American Reliable on a standalone basis 3.00%                
Investment advisory fee $ 1,500                
Aggregate investment advisory fee $ 6,500                
Ordinary shares of Global Indemnity issued to pay fees | shares 267,702                
Global Indemnity Group Inc | Business Acquisition Cost                  
Business Acquisition [Line Items]                  
Business combination, additional costs       $ 1,800   $ 3,300 $ 5,100