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Income Before Income Taxes from its Non-U.S. Subsidiaries and U.S. Subsidiaries (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 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
Net investment income | 8,852 | 6,527 | 26,234 | 22,488
Net realized investment gains (losses) | (10,778) | 1,158 | (7,216) | 40,226
Other income (loss) | 1,279 | 126 | 2,408 | 449
Total revenues | 124,060 | 75,839 | 402,347 | 264,752
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
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
Eliminations |  |  |  |
Revenues: |  |  |  |
Gross premiums written | (57,663) | (27,780) | (241,718) | (82,552)
Net investment income | (6,575) | (4,841) | (19,506) | (14,439)
Total revenues | (6,575) | (4,841) | (19,506) | (14,439)
Losses and Expenses: |  |  |  |
Interest expense | (6,575) | (4,841) | (19,506) | (14,439)
Non-U.S. Subsidiaries |  |  |  |
Revenues: |  |  |  |
Gross premiums written | 67,543 | 38,387 | 289,940 | 139,714
Net premiums written | 67,534 | 38,366 | 289,892 | 138,677
Net premiums earned | 70,532 | 43,238 | 214,667 | 126,551
Net investment income | 10,644 | 7,713 | 32,146 | 22,947
Net realized investment gains (losses) | (1,256) | (10) | (1,643) | 1,017
Other income (loss) | (11) | (38) | (77) | (41)
Total revenues | 79,909 | 50,903 | 245,093 | 150,474
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 39,849 | 18,939 | 115,654 | 51,818
Acquisition costs and other underwriting expenses | 30,504 | 17,762 | 92,368 | 52,637
Corporate and other operating expenses | 1,648 | 1,156 | 3,395 | 4,034
Interest expense | 1,501 | 193 | 2,325 | 647
Income (loss) before income taxes | 6,407 | 12,853 | 31,351 | 41,338
U.S. Subsidiaries |  |  |  |
Revenues: |  |  |  |
Gross premiums written | 140,268 | 56,491 | 411,310 | 170,038
Net premiums written | 54,963 | 24,896 | 104,714 | 73,818
Net premiums earned | 54,175 | 24,790 | 166,254 | 75,038
Net investment income | 4,783 | 3,655 | 13,594 | 13,980
Net realized investment gains (losses) | (9,522) | 1,168 | (5,573) | 39,209
Other income (loss) | 1,290 | 164 | 2,485 | 490
Total revenues | 50,726 | 29,777 | 176,760 | 128,717
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 37,842 | 17,715 | 111,216 | 61,678
Acquisition costs and other underwriting expenses | 20,430 | 9,696 | 57,750 | 28,477
Corporate and other operating expenses | 1,919 | 2,325 | 16,046 | 5,580
Interest expense | 6,669 | 4,766 | 19,816 | 14,420
Income (loss) before income taxes | $ (16,134) | $ (4,725) | $ (28,068) | $ 18,562

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