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Income (Loss) 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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenues: |  |  |  |
Gross written premiums | $ 143,749 | $ 157,177 | $ 464,022 | $ 478,699
Net written premiums | 130,611 | 138,836 | 416,987 | 421,321
Net earned premiums | 140,302 | 133,312 | 426,617 | 383,602
Net investment income | 11,746 | 11,348 | 19,516 | 32,393
Net realized investment gains (losses) | 7,323 | (2,690) | (22,332) | 11,290
Other income (loss) | 542 | 264 | 1,473 | 1,274
Total revenues | 159,913 | 142,234 | 425,274 | 428,559
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 97,148 | 73,583 | 242,092 | 201,979
Acquisition costs and other underwriting expenses | 53,268 | 53,366 | 163,258 | 153,643
Corporate and other operating expenses | 21,196 | 3,858 | 34,037 | 11,702
Interest expense | 3,620 | 5,023 | 13,197 | 15,088
Loss on extinguishment of debt | 3,060 | 0 | 3,060 | 0
Income (loss) before income taxes | (18,379) | 6,404 | (30,370) | 46,147
Non-U.S. Subsidiaries |  |  |  |
Revenues: |  |  |  |
Gross written premiums | 13,085 | 19,980 | 46,654 | 69,588
Net written premiums | 13,085 | 19,990 | 46,654 | 69,591
Net earned premiums | 9,983 | 19,512 | 53,384 | 52,798
Net investment income | 4,054 | 7,212 | 17,336 | 22,254
Net realized investment gains (losses) | 1,511 | 375 | (3,867) | 1,768
Other income (loss) | 164 | (234) | 148 | (256)
Total revenues | 15,712 | 26,865 | 67,001 | 76,564
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 519 | 7,628 | 12,874 | 24,076
Acquisition costs and other underwriting expenses | 3,584 | 6,201 | 17,828 | 16,556
Corporate and other operating expenses | 17,283 | 1,514 | 23,357 | 4,822
Interest expense | 193 | 351 | 869 | 1,059
Loss on extinguishment of debt | 3,060 |  | 3,060 |
Income (loss) before income taxes | (8,927) | 11,171 | 9,013 | 30,051
U.S. Subsidiaries |  |  |  |
Revenues: |  |  |  |
Gross written premiums | 130,664 | 137,197 | 417,368 | 409,111
Net written premiums | 117,526 | 118,846 | 370,333 | 351,730
Net earned premiums | 130,319 | 113,800 | 373,233 | 330,804
Net investment income | 9,851 | 7,732 | 11,324 | 20,824
Net realized investment gains (losses) | 5,812 | (3,065) | (18,465) | 9,522
Other income (loss) | 378 | 498 | 1,325 | 1,530
Total revenues | 146,360 | 118,965 | 367,417 | 362,680
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 96,629 | 65,955 | 229,218 | 177,903
Acquisition costs and other underwriting expenses | 49,684 | 47,165 | 145,430 | 137,087
Corporate and other operating expenses | 3,913 | 2,344 | 10,680 | 6,880
Interest expense | 5,586 | 8,268 | 21,472 | 24,714
Loss on extinguishment of debt | 0 |  | 0 |
Income (loss) before income taxes | (9,452) | (4,767) | (39,383) | 16,096
Eliminations |  |  |  |
Revenues: |  |  |  |
Gross written premiums | 0 | 0 | 0 | 0
Net written premiums | 0 | 0 | 0 | 0
Net earned premiums | 0 | 0 | 0 | 0
Net investment income | (2,159) | (3,596) | (9,144) | (10,685)
Net realized investment gains (losses) | 0 | 0 | 0 | 0
Other income (loss) | 0 | 0 | 0 | 0
Total revenues | (2,159) | (3,596) | (9,144) | (10,685)
Losses and Expenses: |  |  |  |
Net losses and loss adjustment expenses | 0 | 0 | 0 | 0
Acquisition costs and other underwriting expenses | 0 | 0 | 0 | 0
Corporate and other operating expenses | 0 | 0 | 0 | 0
Interest expense | (2,159) | (3,596) | (9,144) | (10,685)
Loss on extinguishment of debt | 0 |  | 0 |
Income (loss) before income taxes | $ 0 | $ 0 | $ 0 | $ 0

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