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Organization (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Aug. 20, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 15, 2012
Organization [Line Items]
Ownership percentage				85.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Sale of stock, price per share (in dollars per share)		$ 15.05us-gaap_SharePrice	$ 10.89us-gaap_SharePrice
Hiscox | Catastrophe Fund Manager
Organization [Line Items]
Ownership percentage				15.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_CounterpartyNameAxis = tpre_HiscoxMember / dei_LegalEntityAxis = tpre_ThirdPointReinsuranceInvestmentManagementLtd.Member
IPO
Organization [Line Items]
Issuance of common shares (in shares)	24,832,484us-gaap_StockIssuedDuringPeriodSharesNewIssues / tpre_SaleofStockAxis = us-gaap_IPOMember
Sale of stock, price per share (in dollars per share)	$ 12.50us-gaap_SharePrice / tpre_SaleofStockAxis = us-gaap_IPOMember
Sale of stock, net proceeds	$ 286.0us-gaap_ProceedsFromIssuanceInitialPublicOffering / tpre_SaleofStockAxis = us-gaap_IPOMember

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Price of a single share of a number of saleable stocks of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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