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Summary of Business Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written |  | $ 150,148 |  | $ 67,098 |  | $ 459,532 |  | $ 227,200 |  |
Net premiums written |  | 122,497 |  | 63,262 |  | 394,606 |  | 212,495 |  |
Net premiums earned |  | 124,707 |  | 68,028 |  | 380,921 |  | 201,589 |  |
Other income (loss) |  | 1,279 |  | 126 |  | 2,408 |  | 449 |  |
Total revenues |  | 125,986 |  | 68,154 |  | 383,329 |  | 202,038 |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses |  | 77,691 |  | 36,654 |  | 226,870 |  | 113,496 |  |
Acquisition costs and other underwriting expenses |  | 50,934 |  | 27,458 |  | 150,118 |  | 81,114 |  |
Income (loss) from segments |  | (2,639) |  | 4,042 |  | 6,341 |  | 7,428 |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Net investment income |  | 8,852 |  | 6,527 |  | 26,234 |  | 22,488 |  |
Net realized investment gains |  | (10,778) |  | 1,158 |  | (7,216) |  | 40,226 |  |
Corporate and other operating expenses |  | (3,567) |  | (3,481) |  | (19,441) |  | (9,614) |  |
Interest expense |  | (1,595) |  | (118) |  | (2,635) |  | (628) |  |
Income (loss) before income taxes |  | (9,727) |  | 8,128 |  | 3,283 |  | 59,900 |  |
Income tax benefit |  | 5,981 |  | 1,633 |  | 10,882 |  | (8,108) |  |
Net income |  | (3,746) |  | 9,761 |  | 14,165 |  | 51,792 |  |
Total assets |  | 2,318,619 |  | 1,879,815 |  | 2,318,619 |  | 1,879,815 |  | $ 1,930,033
Commercial Lines |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written | [1] | 52,920 |  | 56,489 |  | 161,746 |  | 170,037 |  |
Net premiums written | [1] | 49,325 |  | 52,674 |  | 149,647 |  | 156,369 |  |
Net premiums earned | [1] | 48,916 |  | 52,462 |  | 149,244 |  | 158,809 |  |
Other income (loss) | [1] | 102 |  | 164 |  | 420 |  | 490 |  |
Total revenues | [1] | 49,018 |  | 52,626 |  | 149,664 |  | 159,299 |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses | [1] | 22,832 |  | 29,575 |  | 82,474 |  | 97,047 |  |
Acquisition costs and other underwriting expenses | [1] | 20,686 | [2] | 21,790 | [3] | 61,317 | [4] | 66,068 | [5] |
Income (loss) from segments | [1] | 5,500 |  | 1,261 |  | 5,873 |  | (3,816) |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Total assets | [1] | 1,005,435 |  | 1,229,463 |  | 1,005,435 |  | 1,229,463 |  |
Personal Lines |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written | [1] | 87,349 |  |  |  | 249,564 |  |  |  |
Net premiums written | [1] | 63,302 |  |  |  | 196,785 |  |  |  |
Net premiums earned | [1] | 62,132 |  |  |  | 191,472 |  |  |  |
Other income (loss) | [1] | 1,188 |  |  |  | 2,065 |  |  |  |
Total revenues | [1] | 63,320 |  |  |  | 193,537 |  |  |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses | [1] | 48,899 |  |  |  | 129,997 |  |  |  |
Acquisition costs and other underwriting expenses | [1] | 25,779 | [6] |  |  | 74,590 | [7] |  |  |
Income (loss) from segments | [1] | (11,358) |  |  |  | (11,050) |  |  |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Total assets | [1] | 572,807 |  |  |  | 572,807 |  |  |  |
Reinsurance Operations |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |
Gross premiums written | [8] | 9,879 |  | 10,609 |  | 48,222 |  | 57,163 |  |
Net premiums written | [8] | 9,870 |  | 10,588 |  | 48,174 |  | 56,126 |  |
Net premiums earned | [8] | 13,659 |  | 15,566 |  | 40,205 |  | 42,780 |  |
Other income (loss) | [8] | (11) |  | (38) |  | (77) |  | (41) |  |
Total revenues | [8] | 13,648 |  | 15,528 |  | 40,128 |  | 42,739 |  |
Losses and Expenses: |  |  |  |  |  |  |  |  |  |
Net losses and loss adjustment expenses | [8] | 5,960 |  | 7,079 |  | 14,399 |  | 16,449 |  |
Acquisition costs and other underwriting expenses | [8] | 4,469 |  | 5,668 |  | 14,211 |  | 15,046 |  |
Income (loss) from segments | [8] | 3,219 |  | 2,781 |  | 11,518 |  | 11,244 |  |
Unallocated Items: |  |  |  |  |  |  |  |  |  |
Total assets | [8],[9] | $ 740,377 |  | $ 650,352 |  | $ 740,377 |  | $ 650,352 |  |
[1] | Includes business ceded to the Company's Reinsurance Operations.
[2] | Includes federal excise tax of $258 relating to cessions from Commercial Lines to Reinsurance Operations.
[3] | Includes federal excise tax of $277 relating to cessions from Commercial Lines to Reinsurance Operations.
[4] | Includes federal excise tax of $787 relating to cessions from Commercial Lines to Reinsurance Operations.
[5] | Includes federal excise tax of $838 relating to cessions from Commercial Lines to Reinsurance Operations.
[6] | Includes federal excise tax of $310 relating to cessions from Personal Lines to Reinsurance Operations.
[7] | Includes federal excise tax of $957 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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