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Summary of Business Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written |  | $ 166,515 |  | $ 82,905 |  | $ 309,384 |  | $ 160,102 |  |
Net premiums written |  | 146,005 |  | 76,372 |  | 272,109 |  | 149,233 |  |
Net premiums earned |  | 128,877 |  | 66,017 |  | 256,214 |  | 133,561 |  |
Other income (loss) |  | 577 |  | 155 |  | 1,129 |  | 323 |  |
Total revenues |  | 129,454 |  | 66,172 |  | 257,343 |  | 133,884 |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses |  | 79,560 |  | 38,270 |  | 149,179 |  | 76,842 |  |
Acquisition costs and other underwriting expenses |  | 50,926 |  | 27,171 |  | 99,184 |  | 53,656 |  |
Income (loss) from segments |  | (1,032) |  | 731 |  | 8,980 |  | 3,386 |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Net investment income |  | 9,141 |  | 7,677 |  | 17,382 |  | 15,961 |  |
Net realized investment gains |  | 6,532 |  | 39,881 |  | 3,562 |  | 39,068 |  |
Corporate and other operating expenses |  | (4,334) |  | (3,172) |  | (15,874) |  | (6,133) |  |
Interest expense |  | (535) |  | (319) |  | (1,040) |  | (510) |  |
Income before income taxes |  | 9,772 |  | 44,798 |  | 13,010 |  | 51,772 |  |
Income tax benefit |  | 1,345 |  | (11,590) |  | 4,901 |  | (9,741) |  |
Net income |  | 11,117 |  | 33,208 |  | 17,911 |  | 42,031 |  |
Total assets |  | 2,260,458 |  | 1,977,687 |  | 2,260,458 |  | 1,977,687 |  | $ 1,930,033
Commercial Lines |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written | [1] | 59,033 |  | 60,556 |  | 108,826 |  | 113,548 |  |
Net premiums written | [1] | 54,700 |  | 55,039 |  | 100,322 |  | 103,695 |  |
Net premiums earned | [1] | 49,614 |  | 53,034 |  | 100,328 |  | 106,347 |  |
Other income (loss) | [1] | 153 |  | 160 |  | 318 |  | 326 |  |
Total revenues | [1] | 49,767 |  | 53,194 |  | 100,646 |  | 106,673 |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses | [1] | 30,039 |  | 33,875 |  | 59,642 |  | 67,472 |  |
Acquisition costs and other underwriting expenses | [1] | 20,008 | [2] | 22,560 | [3] | 40,631 | [4] | 44,278 | [5] |
Income (loss) from segments | [1] | (280) |  | (3,241) |  | 373 |  | (5,077) |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Total assets | [1] | 944,744 |  | 1,316,314 |  | 944,744 |  | 1,316,314 |  |
Personal Lines |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written | [1] | 89,004 |  |  |  | 162,215 |  |  |  |
Net premiums written | [1] | 72,827 |  |  |  | 133,483 |  |  |  |
Net premiums earned | [1] | 65,918 |  |  |  | 129,340 |  |  |  |
Other income (loss) | [1] | 411 |  |  |  | 877 |  |  |  |
Total revenues | [1] | 66,329 |  |  |  | 130,217 |  |  |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses | [1] | 45,180 |  |  |  | 81,098 |  |  |  |
Acquisition costs and other underwriting expenses | [1] | 26,065 | [6] |  |  | 48,811 | [7] |  |  |
Income (loss) from segments | [1] | (4,916) |  |  |  | 308 |  |  |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Total assets | [1] | 554,302 |  |  |  | 554,302 |  |  |  |
Reinsurance Operations |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written | [8] | 18,478 |  | 22,349 |  | 38,343 |  | 46,554 |  |
Net premiums written | [8] | 18,478 |  | 21,333 |  | 38,304 |  | 45,538 |  |
Net premiums earned | [8] | 13,345 |  | 12,983 |  | 26,546 |  | 27,214 |  |
Other income (loss) | [8] | 13 |  | (5) |  | (66) |  | (3) |  |
Total revenues | [8] | 13,358 |  | 12,978 |  | 26,480 |  | 27,211 |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses | [8] | 4,341 |  | 4,395 |  | 8,439 |  | 9,370 |  |
Acquisition costs and other underwriting expenses | [8] | 4,853 |  | 4,611 |  | 9,742 |  | 9,378 |  |
Income (loss) from segments | [8] | 4,164 |  | 3,972 |  | 8,299 |  | 8,463 |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Total assets | [8],[9] | $ 761,412 |  | $ 661,373 |  | $ 761,412 |  | $ 661,373 |  |
[1] | Includes business ceded to the Company's Reinsurance Operations.
[2] | Includes federal excise tax of $261 relating to cessions from Commercial Lines to Reinsurance Operations.
[3] | Includes federal excise tax of $281 relating to cessions from Commercial Lines to Reinsurance Operations.
[4] | Includes federal excise tax of $529 relating to cessions from Commercial Lines to Reinsurance Operations.
[5] | Includes federal excise tax of $561 relating to cessions from Commercial Lines to Reinsurance Operations.
[6] | Includes federal excise tax of $330 relating to cessions from Personal Lines to Reinsurance Operations.
[7] | Includes federal excise tax of $647 relating to cessions from Personal Lines to Reinsurance Operations.
[8] | External business only, excluding business assumed from affiliates.
[9] | Comprised of Global Indemnity Reinsurance's total assets less its investment in subsidiaries.

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