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Segment reporting - Operating Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 134,230 | $ 95,388 | $ 82,637 | $ 319,591 | $ 120,063 | $ 30,064 | $ 49,765 | $ 378,360 | $ 631,846 | $ 578,252 | $ 641,620
Gross premiums ceded | (5,964) | (1,116) | (1,473) | (712) | (1,770) | 0 | (3,479) | (14,646) | (9,265) | (19,895) | (2,475)
Net premiums written | 128,266 | 94,272 | 81,164 | 318,879 | 118,293 | 30,064 | 46,286 | 363,714 | 622,581 | 558,357 | 639,145
Change in net unearned premium reserves | 70,126 | 108,976 | 64,288 | (165,829) | 91,177 | 97,929 | 95,207 | (221,228) | 77,561 | 63,085 | (92,087)
Net premiums earned | 198,392 | 203,248 | 145,452 | 153,050 | 209,470 | 127,993 | 141,493 | 142,486 | 700,142 | 621,442 | 547,058
Loss and loss adjustment expenses incurred, net | 140,394 | 85,703 | 82,334 | 95,068 | 173,088 | 88,706 | 84,000 | 92,620 | 403,499 | 438,414 | 370,058
Acquisition costs, net | 61,851 | 118,271 | 58,006 | 57,498 | 56,668 | 40,841 | 57,584 | 51,405 | 295,626 | 206,498 | 188,904
General and administrative expenses | (12,744) | (9,237) | (19,650) | (12,132) | (7,553) | (9,511) | (9,696) | (9,481) | (53,763) | (36,241) | (53,103)
Net investment income (loss) |  |  |  |  |  |  |  |  | 722,491 | 663,547 | 589,618
Net investment income (loss) | (61,614) | 3,138 | (69,131) | (154,953) | 276,810 | 3,590 | (31,175) | 2,208 | (282,560) | 251,433 | (391,953)
Other expenses | (3,625) | (5,058) | (3,811) | (4,125) | (2,994) | 1,362 | (3,983) | (3,995) | (16,619) | (9,610) | (12,674)
Interest expense | (2,074) | (2,074) | (2,051) | (2,029) | (2,074) | (2,074) | (2,051) | (2,029) | (8,228) | (8,228) | (8,225)
Foreign exchange (gains) losses | (10,298) | 4,921 | 4,260 | (2,518) | 3,288 | 1,979 | 8,847 | (6,611) | (3,635) | 7,503 | (12,300)
Income tax (expense) benefit | 718 | 213 | 74 | (1,718) | 8,417 | 111 | (4,390) | (128) | (713) | 4,010 | (11,976)
Net income attributable to noncontrolling interests in related party | 0 | 0 | 0 | 0 | 0 | (4) | (209) | (10) | 0 | (223) | (3,973)
Net income (loss) available to Third Point Re common shareholders | $ 29,738 | $ (15,099) | $ 53,065 | $ 132,915 | $ (298,012) | $ (13,281) | $ 19,602 | $ (26,001) | 200,619 | (317,692) | 277,798
Property and Casualty Reinsurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 631,846 | $ 578,252 | $ 641,620
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Operating Segments | Property and Casualty Reinsurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 631,846 | $ 578,252 | $ 641,620
Gross premiums ceded |  |  |  |  |  |  |  |  | (9,265) | (19,895) | (2,475)
Net premiums written |  |  |  |  |  |  |  |  | 622,581 | 558,357 | 639,145
Change in net unearned premium reserves |  |  |  |  |  |  |  |  | 77,561 | 63,085 | (92,087)
Net premiums earned |  |  |  |  |  |  |  |  | 700,142 | 621,442 | 547,058
Loss and loss adjustment expenses incurred, net |  |  |  |  |  |  |  |  | 403,499 | 438,414 | 370,058
Acquisition costs, net |  |  |  |  |  |  |  |  | 295,626 | 206,498 | 188,904
General and administrative expenses |  |  |  |  |  |  |  |  | (23,366) | (18,635) | (30,656)
Net investment income (loss) |  |  |  |  |  |  |  |  | 722,491 | 663,547 | 589,618
Net underwriting loss |  |  |  |  |  |  |  |  | $ 22,349 | $ 42,105 | $ 42,560
Loss ratio |  |  |  |  |  |  |  |  | 57.60% | 70.60% | 67.60%
Acquisition cost ratio |  |  |  |  |  |  |  |  | 42.20% | 33.20% | 34.50%
Composite ratio |  |  |  |  |  |  |  |  | 99.80% | 103.80% | 102.10%
General and administrative expense ratio |  |  |  |  |  |  |  |  | 3.40% | 3.00% | 5.60%
Combined ratio |  |  |  |  |  |  |  |  | 103.20% | 106.80% | 107.70%
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ (30,397) | $ (17,606) | $ (22,447)

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