Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Assets
Total investments in securities	$ 1,000,993,000	$ 989,701,000
Cash and cash equivalents	584,809,000	639,415,000
Restricted cash and cash equivalents	887,308,000	1,014,543,000
Investment in subsidiaries	0	0
Due from brokers	169,078,000	0
Interest and dividends receivable	2,195,000	2,178,000
Reinsurance balances receivable, net	613,204,000	596,120,000
Deferred acquisition costs, net	172,288,000	154,717,000
Unearned premiums ceded	35,817,000	16,945,000
Loss and loss adjustment expenses recoverable, net	10,064,000	5,520,000	$ 3,655,000	$ 2,031,000
Amounts due from (to) affiliates	0	0
Other assets	17,807,000	20,555,000
Total assets	3,493,563,000	3,439,694,000
Liabilities
Accounts payable and accrued expenses	(12,167,000)	(17,816,000)
Reinsurance balances payable	94,810,000	81,941,000
Deposit liabilities	168,910,000	172,259,000		$ 145,342,000
Unearned premium reserves	587,995,000	524,768,000
Loss and loss adjustment expense reserves	1,133,983,000	1,111,692,000
Securities sold, not yet purchased, at fair value	19,597,000	0
Due to brokers	1,456,000	0
Interest and Dividends Payable	3,164,000	3,055,000
Senior notes payable, net of deferred costs	114,177,000	114,089,000
Total liabilities	2,136,259,000	2,025,620,000
Shareholders’ equity
Common shares	9,492,000	9,423,000
Additional paid-in capital	930,487,000	927,704,000
Retained earnings	417,325,000	476,947,000
Shareholders’ equity attributable to Third Point Re common shareholders	1,357,304,000	1,414,074,000	$ 1,395,898,000
Total liabilities and shareholders’ equity	3,493,563,000	3,439,694,000
Eliminations
Assets
Total investments in securities	0	0
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Investment in subsidiaries	(1,832,394,000)	(1,881,898,000)
Due from brokers	0
Interest and dividends receivable	0	0
Reinsurance balances receivable, net	0	0
Deferred acquisition costs, net	0	0
Unearned premiums ceded	0	0
Loss and loss adjustment expenses recoverable, net	0	0
Amounts due from (to) affiliates	0	0
Other assets	0	0
Total assets	(1,832,394,000)	(1,881,898,000)
Liabilities
Accounts payable and accrued expenses	0	0
Reinsurance balances payable	0	0
Deposit liabilities	0	0
Unearned premium reserves	0	0
Loss and loss adjustment expense reserves	0	0
Securities sold, not yet purchased, at fair value	0
Due to brokers	0
Interest and Dividends Payable	0	0
Senior notes payable, net of deferred costs	0	0
Total liabilities	0	0
Shareholders’ equity
Common shares	(1,239,000)	(1,239,000)
Additional paid-in capital	(1,787,045,000)	(1,783,157,000)
Retained earnings	(44,110,000)	(97,502,000)
Shareholders’ equity attributable to Third Point Re common shareholders	(1,832,394,000)	(1,881,898,000)
Total liabilities and shareholders’ equity	(1,832,394,000)	(1,881,898,000)
Third Point Re | Reportable Legal Entities
Assets
Total investments in securities	4,000,000	4,000,000
Cash and cash equivalents	6,000	10,000
Restricted cash and cash equivalents	0	0
Investment in subsidiaries	1,359,206,000	1,419,197,000
Due from brokers	0
Interest and dividends receivable	0	0
Reinsurance balances receivable, net	0	0
Deferred acquisition costs, net	0	0
Unearned premiums ceded	0	0
Loss and loss adjustment expenses recoverable, net	0	0
Amounts due from (to) affiliates	(2,515,000)	(5,722,000)
Other assets	270,000	764,000
Total assets	1,360,967,000	1,418,249,000
Liabilities
Accounts payable and accrued expenses	(3,663,000)	(4,175,000)
Reinsurance balances payable	0	0
Deposit liabilities	0	0
Unearned premium reserves	0	0
Loss and loss adjustment expense reserves	0	0
Securities sold, not yet purchased, at fair value	0
Due to brokers	0
Interest and Dividends Payable	0	0
Senior notes payable, net of deferred costs	0	0
Total liabilities	3,663,000	4,175,000
Shareholders’ equity
Common shares	9,492,000	9,423,000
Additional paid-in capital	930,487,000	927,704,000
Retained earnings	417,325,000	476,947,000
Shareholders’ equity attributable to Third Point Re common shareholders	1,357,304,000	1,414,074,000
Total liabilities and shareholders’ equity	1,360,967,000	1,418,249,000
TPRUSA | Reportable Legal Entities
Assets
Total investments in securities	0	0
Cash and cash equivalents	167,000	176,000
Restricted cash and cash equivalents	0	0
Investment in subsidiaries	281,603,000	271,624,000
Due from brokers	0
Interest and dividends receivable	0	0
Reinsurance balances receivable, net	0	0
Deferred acquisition costs, net	0	0
Unearned premiums ceded	0	0
Loss and loss adjustment expenses recoverable, net	0	0
Amounts due from (to) affiliates	77,000	(3,898,000)
Other assets	7,646,000	6,784,000
Total assets	289,493,000	274,686,000
Liabilities
Accounts payable and accrued expenses	0	0
Reinsurance balances payable	0	0
Deposit liabilities	0	0
Unearned premium reserves	0	0
Loss and loss adjustment expense reserves	0	0
Securities sold, not yet purchased, at fair value	0
Due to brokers	0
Interest and Dividends Payable	3,035,000	3,055,000
Senior notes payable, net of deferred costs	114,177,000	114,089,000
Total liabilities	117,212,000	117,144,000
Shareholders’ equity
Common shares	0	0
Additional paid-in capital	191,906,000	191,361,000
Retained earnings	(19,625,000)	(33,819,000)
Shareholders’ equity attributable to Third Point Re common shareholders	172,281,000	157,542,000
Total liabilities and shareholders’ equity	289,493,000	274,686,000
Non-Guarantor Subsidiaries | Reportable Legal Entities
Assets
Total investments in securities	996,993,000	985,701,000
Cash and cash equivalents	584,636,000	639,229,000
Restricted cash and cash equivalents	887,308,000	1,014,543,000
Investment in subsidiaries	191,585,000	191,077,000
Due from brokers	169,078,000
Interest and dividends receivable	2,195,000	2,178,000
Reinsurance balances receivable, net	613,204,000	596,120,000
Deferred acquisition costs, net	172,288,000	154,717,000
Unearned premiums ceded	35,817,000	16,945,000
Loss and loss adjustment expenses recoverable, net	10,064,000	5,520,000
Amounts due from (to) affiliates	2,438,000	9,620,000
Other assets	9,891,000	13,007,000
Total assets	3,675,497,000	3,628,657,000
Liabilities
Accounts payable and accrued expenses	(8,504,000)	(13,641,000)
Reinsurance balances payable	94,810,000	81,941,000
Deposit liabilities	168,910,000	172,259,000
Unearned premium reserves	587,995,000	524,768,000
Loss and loss adjustment expense reserves	1,133,983,000	1,111,692,000
Securities sold, not yet purchased, at fair value	19,597,000
Due to brokers	1,456,000
Interest and Dividends Payable	129,000	0
Senior notes payable, net of deferred costs	0	0
Total liabilities	2,015,384,000	1,904,301,000
Shareholders’ equity
Common shares	1,239,000	1,239,000
Additional paid-in capital	1,595,139,000	1,591,796,000
Retained earnings	63,735,000	131,321,000
Shareholders’ equity attributable to Third Point Re common shareholders	1,660,113,000	1,724,356,000
Total liabilities and shareholders’ equity	3,675,497,000	$ 3,628,657,000
Financial Guarantee | TPRUSA
Condensed Balance Sheet Statements, Captions [Line Items]
Debt obligation	$ 115,000,000.0