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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 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
Net investment income | 9,141 | 7,677 | 17,382 | 15,961
Net realized investment gains (losses) | 6,532 | 39,881 | 3,562 | 39,068
Other income (loss) | 577 | 155 | 1,129 | 323
Total revenues | 145,127 | 113,730 | 278,287 | 188,913
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
Corporate and other operating expenses | 4,334 | 3,172 | 15,874 | 6,133
Interest expense | 535 | 319 | 1,040 | 510
Income (loss) before income taxes | 9,772 | 44,798 | 13,010 | 51,772
Non-U.S. Subsidiaries |  |  |  |
Revenues: |  |  |  |
Gross premiums written | 83,601 | 51,328 | 222,397 | 101,327
Net premiums written | 83,601 | 50,312 | 222,358 | 100,311
Net premiums earned | 72,471 | 40,959 | 144,135 | 83,313
Net investment income | 11,320 | 7,583 | 21,502 | 15,234
Net realized investment gains (losses) | (118) | (225) | (387) | 1,027
Other income (loss) | 13 | (5) | (66) | (3)
Total revenues | 83,686 | 48,312 | 165,184 | 99,571
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 39,621 | 12,921 | 75,805 | 32,879
Acquisition costs and other underwriting expenses | 31,570 | 17,081 | 61,864 | 34,875
Corporate and other operating expenses | (334) | 1,511 | 1,747 | 2,878
Interest expense | 430 | 214 | 824 | 454
Income (loss) before income taxes | 12,399 | 16,585 | 24,944 | 28,485
U.S. Subsidiaries |  |  |  |
Revenues: |  |  |  |
Gross premiums written | 148,038 | 60,555 | 271,042 | 113,547
Net premiums written | 62,404 | 26,060 | 49,751 | 48,922
Net premiums earned | 56,406 | 25,058 | 112,079 | 50,248
Net investment income | 4,325 | 4,905 | 8,811 | 10,325
Net realized investment gains (losses) | 6,650 | 40,106 | 3,949 | 38,041
Other income (loss) | 564 | 160 | 1,195 | 326
Total revenues | 67,945 | 70,229 | 126,034 | 98,940
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 39,939 | 25,349 | 73,374 | 43,963
Acquisition costs and other underwriting expenses | 19,356 | 10,090 | 37,320 | 18,781
Corporate and other operating expenses | 4,668 | 1,661 | 14,127 | 3,255
Interest expense | 6,609 | 4,916 | 13,147 | 9,654
Income (loss) before income taxes | (2,627) | 28,213 | (11,934) | 23,287
Eliminations |  |  |  |
Revenues: |  |  |  |
Gross premiums written | (65,124) | (28,978) | (184,055) | (54,772)
Net investment income | (6,504) | (4,811) | (12,931) | (9,598)
Total revenues | (6,504) | (4,811) | (12,931) | (9,598)
Losses and Expenses: |  |  |  |
Interest expense | $ (6,504) | $ (4,811) | $ (12,931) | $ (9,598)

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