Catastrophe Bond Program (Details)	Jun. 26, 2013 USD ($) reinsurance_agreement
Individual Hurricane Coverage \| June 26, 2013 Ibis Re II Ltd. Agreement
Reinsurance Retention Policy [Line Items]
Number of reinsurance agreements \| reinsurance_agreement	3
Reinsurance coverage (up to)	$ 185,000,000
Reinsurance coverage period	3 years
Ibis Re II \| Senior 2013-1 Notes
Reinsurance Retention Policy [Line Items]
Issuance amount	$ 185,000,000

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant