Quarterly Financial Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
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
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
Total revenues	260,006	200,110	214,583	308,003	(67,340)	124,403	172,668	140,278	982,702	370,009	939,011
Expenses
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
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 currency (gain) loss	10,298	(4,921)	(4,260)	2,518	(3,288)	(1,979)	(8,847)	6,611	3,635	(7,503)	12,300
Total expenses	230,986	215,422	161,592	173,370	239,089	137,791	148,467	166,141	781,370	691,488	645,264
Income (loss) before income tax (expense) benefit	29,020	(15,312)	52,991	134,633	(306,429)	(13,388)	24,201	(25,863)	201,332	(321,479)	293,747
Income tax (expense) benefit	718	213	74	(1,718)	8,417	111	(4,390)	(128)	(713)	4,010	(11,976)
Net income (loss)	29,738	(15,099)	53,065	132,915	(298,012)	(13,277)	19,811	(25,991)	200,619	(317,469)	281,771
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
Earnings (loss) per share available to Third Point Re common shareholders
Basic (in dollars per share)	$ 0.32	$ (0.16)	$ 0.58	$ 1.45	$ (3.24)	$ (0.14)	$ 0.20	$ (0.26)	$ 2.18	$ (3.27)	$ 2.71
Diluted (in dollars per share)	$ 0.32	$ (0.16)	$ 0.57	$ 1.43	$ (3.24)	$ (0.14)	$ 0.19	$ (0.26)	$ 2.16	$ (3.27)	$ 2.64
Weighted average number of common shares used in the determination of earnings (loss) per share
Basic (in shares)	91,989,469	91,903,556	91,776,870	91,669,810	91,967,831	95,671,385	99,498,901	101,195,747	91,835,990	97,054,315	102,264,094
Diluted (in shares)	92,696,491	91,903,556	92,801,799	92,578,933	91,967,831	95,671,385	102,032,485	101,195,747	92,652,316	97,054,315	105,227,038