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Acquisition - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jan. 01, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Agent
Jun. 30, 2015
USD ($)
Apr. 30, 2015
USD ($)
Business Acquisition [Line Items]                
Revenue   $ 145,127 $ 113,730 $ 278,287 $ 188,913      
Pre-tax income (loss)   9,772 $ 44,798 $ 13,010 $ 51,772      
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.        
Losses and Loss Adjustment Expenses                
Business Acquisition [Line Items]                
Liabilities, Fair Value Adjustment       $ (600)        
Other Liabilities                
Business Acquisition [Line Items]                
Liabilities, Fair Value Adjustment       (300)        
Agreement with unrelated third party to build out a rate, quote, bind and issue application for the agriculture products                
Business Acquisition [Line Items]                
Estimated project cost               $ 2,600
Accounts Receivable                
Business Acquisition [Line Items]                
Assets, Fair Value Adjustment       (200)        
Value of business acquired                
Business Acquisition [Line Items]                
Assets, Fair Value Adjustment       (500)        
Deferred Income Tax Charge                
Business Acquisition [Line Items]                
Assets, Fair Value Adjustment       100        
Goodwill                
Business Acquisition [Line Items]                
Assets, Fair Value Adjustment       100        
American Reliable Insurance Company                
Business Acquisition [Line Items]                
Revenue   67,300   132,600        
Pre-tax income (loss)   (4,000)   2,700        
Ceded written premiums   16,177   28,732        
Ceded earned premiums   21,609   42,879        
Rental expense under operating leases, net of sub-lease income   200   500        
American Reliable Insurance Company | American Bankers Insurance Company                
Business Acquisition [Line Items]                
Ceded written premiums   12,900   23,000        
Ceded earned premiums   18,600   37,400        
American Reliable Insurance Company | Various Reinsurers Owned by Assurant, Inc.                
Business Acquisition [Line Items]                
Ceded written premiums   24,700   48,100        
Ceded earned premiums   $ 23,500   47,200        
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 | Direct 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 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 | 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%        
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 $ 283,400              
Estimated purchase price $ 105,800              
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              
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