Non-controlling interests - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Joint Ventures - Third Point Advisors LLC shares
Noncontrolling Interest [Line Items]
Distributions	$ 1,000,000.0		$ 24.1
Cayman Holdco [Member]
Noncontrolling Interest [Line Items]
Ownership percentage	13.80%		10.80%
Estimated fair value of investment	$ 900,000		$ 2,400,000
Proceeds from Limited Partnership Investments	$ 2,000,000
Third Point Hellenic Recovery US Feeder Fund, L.P. [Member]
Noncontrolling Interest [Line Items]
Ownership percentage	3.00%		3.00%
Estimated fair value of investment	$ 5,700,000		$ 5,400,000
Proceeds from Limited Partnership Investments	0	$ 0
Noncontrolling interest, increase from contributed capital	11,400,000		$ 11,400,000
Committed capital, amount called	$ 0	$ 0

Committed Capital, Amount Called

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- Definition

Noncontrolling Interest, Increase from Contributed Capital

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- Definition

Ownership Percentage

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

+ References

Reference 1: 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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash inflow received as distributions, returns of capital, or sale proceeds from partnership interests held for investment purposes.

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