Represents the common share offering for which the management fees were waived by the manager.

No definition available.

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Namespace Prefix:	kfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the common share rights offering for which the management fees were waived by the manager.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the fees waived by the related party.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionFeesWaivedByRelatedParty
Namespace Prefix:	kfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the minimum affirmative votes required of the entity's independent directors for the termination of the management agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the prior notice period for termination of Management Agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the renewal term of the management agreement each December 31 unless terminated upon by vote.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionManagementAgreementRenewalTerm
Namespace Prefix:	kfn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of times the sum of the average annual base management fee and the average annual incentive fee for the first two 12-month periods is multiplied to determine the termination fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the specified period immediately preceding the date of termination for which the average annual incentive fee is considered for the calculation of the termination fee.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionManagementAgreementTerminationFeesNumberOfPeriodImmediatelyPrecedingTerminationDateConsideredForCalculation
Namespace Prefix:	kfn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of times the specified period for which the average annual incentive fee needs to be considered for the calculation of termination fee.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionManagementAgreementTerminationFeesNumberOfTimesSpecifiedPeriodConsideredForCalculation
Namespace Prefix:	kfn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum closing price per share of the common stock traded on the stock exchange required until which base management fees for the common share offering are no longer waived.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionMinimumCommonStockClosingPricePerShareForWaiverOfFees
Namespace Prefix:	kfn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of CLOs the Company owns less than 100% of the subordinated notes and receives the pro rata share of aggregate CLO management fees.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionNumberOfCLOs
Namespace Prefix:	kfn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of ownership in subordinated note.

+ References

No definition available.

+ Details

Name:	kfn_RelatedPartyTransactionOwnershipPercentageInSubordinateNote
Namespace Prefix:	kfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of consecutive trading days required until which base management fees for the common share offering are no longer waived.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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MANAGEMENT AGREEMENT AND RELATED PARTY TRANSACTIONS (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014	Sep. 30, 2007
Successor Company \| CLO Management Fees
Management Agreement and Related Party Transactions
Number of CLOs the Company owns less than 100% of subordinated notes	3
Successor Company \| CLO Management Fees \| Maximum
Management Agreement and Related Party Transactions
Entity's percentage in subordinated notes (as a percent)	100.00%
Successor Company \| CLO Management Fees \| CLO 2013-1 and CLO 2013-2
Management Agreement and Related Party Transactions
Entity's percentage in subordinated notes (as a percent)	100.00%
Successor Company \| Manager
Management Agreement and Related Party Transactions
Renewal period	1 year
Votes for termination, minimum (as a percent)	66.70%
Notice period for termination	180 days
Multiplier used to determine termination fee	4
Number of 12 month periods considered for calculation of termination fee (in periods)	2
Specified period for which average annual incentive fee to be considered	12 months
Successor Company \| Manager \| Base Management Fees
Management Agreement and Related Party Transactions
Common share closing price, minimum (in dollars per share)	20.00
Number of consecutive trading days	5 days
Related party transaction expense	4,053,000
Successor Company \| Manager \| Incentive Fees
Management Agreement and Related Party Transactions
Related party transaction expense	0
Successor Company \| Collateral manager \| CLO Management Fees
Management Agreement and Related Party Transactions
Fees, waived	500,000
Related party transaction expense	6,167,000
Predecessor Company \| Manager \| Base Management Fees
Management Agreement and Related Party Transactions
Common shares offering			230,400,000
Common share right offering			270,000,000
Fees, waived		2,200,000
Related party transaction expense		3,622,000
Predecessor Company \| Manager \| Incentive Fees
Management Agreement and Related Party Transactions
Related party transaction expense		12,882,000
Predecessor Company \| Manager \| Manager Share-Based Compensation
Management Agreement and Related Party Transactions
Related party transaction expense	0	577,000
Predecessor Company \| Collateral manager \| CLO Management Fees
Management Agreement and Related Party Transactions
Fees, waived		1,600,000
Related party transaction expense		8,536,000
Restricted common shares \| Predecessor Company
Management Agreement and Related Party Transactions
Share-based compensation		841,000
Restricted common shares \| Predecessor Company \| Manager \| Manager Share-Based Compensation
Management Agreement and Related Party Transactions
Share-based compensation		$ 600,000