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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 |  |

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