Fifth Street Asset Management (FSAM) 10-K 30 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Mar. 25, 2015
Document Information [Line Items]
Entity Registrant Name	Fifth Street Asset Management Inc.
Entity Central Index Key	1611988
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$0
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			6,000,033
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			42,856,854

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Management fees (includes Part I Fees of $39,280,991, $30,573,056 and $23,393,156 for the years ended December 31, 2014, 2013 and 2012, respectively)	$95,425,407	$68,417,218	$50,006,748
Performance fees	106,635	0	0
Other fees	7,674,019	5,204,820	4,636,865
Total revenues	103,206,061	73,622,038	54,643,613
Expenses
Compensation and benefits	53,697,430	22,411,155	17,375,619
Fund offering and start-up expenses	1,247,923	5,701,831	0
General, administrative and other expenses	10,365,867	5,506,680	5,038,967
Depreciation and amortization	985,845	236,892	202,834
Total expenses	66,297,065	33,856,558	22,617,420
Other income (expense)
Interest income	13,031	17,575	34,235
Interest expense	-323,363	-11,233	-293
Income from equity method investments	246,361	0	0
Other Nonoperating Income (Expense)	90,049	0	0
Total other income, net	26,078	6,342	33,942
Income before income tax benefit	36,935,074	39,771,822	32,060,135
Income tax benefit	-1,877,758	0	0
Net income	38,812,832	39,771,822	32,060,135
Net income attributable to non-controlling interests in Fifth Street Holdings L.P.	-11,555,298	0	0
Net income attributable to Fifth Street Asset Management Inc.	528,577	0	0
Common Class A [Member]
Other income (expense)
Net income per share attributable to Fifth Street Asset Management Inc. Class A common stock - Basic and Diluted (in dollars per share)	$0.09
Predecessor [Member]
Other income (expense)
Net income	$26,728,957	$39,771,822	$32,060,135

Consolidated_Statements_of_Inc1

Consolidated Statements of Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Part I fees	$39,280,991	$30,573,056	$23,393,156

Consolidated_Statements_of_Fin

Consolidated Statements of Financial Condition (USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$3,238,008	$4,015,728
Prepaid expenses	1,150,013	142,033
Investments in equity method investees	4,115,429	0
Due from affiliates	3,799,542	3,848,491
Fixed assets, net	10,274,263	1,436,681
Deferred tax assets	57,972,039	0
Deferred financing costs	2,432,764	0
Other assets	4,197,358	2,652,975
Total assets	114,147,838	33,505,671
Liabilities
Accounts payable and accrued expenses	3,045,651	1,198,205
Accrued compensation and benefits	11,095,548	538,035
Income taxes payable	361,052	0
Loan payable	4,000,000	4,000,000
Credit facility payable	12,000,000	0
Deferred rent liability	3,261,434	1,980,146
Total liabilities	90,263,503	12,481,157
Commitments and contingencies
Equity
Preferred stock, $0.01 par value; 5,000,000 shares authorized; none issued and outstanding as of December 31, 2014	0	0
Additional paid-in capital	4,975,073	0
Retained earnings	1,288,995	0
Total stockholders' equity, Fifth Street Asset Management Inc.	6,752,637	0
Non-controlling interests in Fifth Street Holdings L.P.	17,131,698	0
Total equity	23,884,335	21,024,514
Total liabilities and equity	114,147,838	33,505,671
Predecessor [Member]
Equity
Members' equity of Predecessor	0	21,024,514
Principal Owner [Member]
Liabilities
Due to related party	9,063,792	0
Affiliated Entity [Member]
Liabilities
Due to related party	62,781	2,671,334
Former Member [Member]
Liabilities
Due to related party	0	2,093,437
Recipients of Tax Receivable Agreements [Member]
Liabilities
Due to related party	47,373,245	0
Common Class A [Member]
Equity
Common stock	60,000	0
Common Class B [Member]
Equity
Common stock	428,569	0
Management Fees Receivable [Member]
Assets
Accounts receivable, related parties	26,861,787	21,409,763
Performance Fees Receivable [Member]
Assets
Accounts receivable, related parties	$106,635	$0

Consolidated_Statements_of_Fin1

Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred stock, par value (dollars per share)	$0.01
Preferred stock, shares authorized	5,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Common Class A [Member]
Common stock par value (dollars per share)	$0.01
Common stock authorized (in shares)	500,000,000
Common stock issued (in shares)	6,000,033
Common shares outstanding (shares)	6,000,033
Common Class B [Member]
Common stock par value (dollars per share)	$0.01
Common stock authorized (in shares)	50,000,000
Common stock issued (in shares)	42,856,854
Common shares outstanding (shares)	42,856,854
Management Fees Receivable [Member]
Part I fees	$11,307,080	$9,054,422

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)	Total	Common Class A [Member]	Common Class B [Member]	Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Non-Controlling Interests in Fifth Street Holdings L.P. [Member]	Predecessor [Member]	Predecessor [Member]
				Common Class A [Member]	Common Class B [Member]		Common Class A [Member]	Common Class B [Member]				Members' Equity [Member]
Beginning balance at Dec. 31, 2011	$10,145,399											$10,145,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions	2,065,664											2,065,664
Limited Liability Company (LLC) Members' Equity, Unit-based Compensation	130,504											130,504
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared	29,924,755											29,924,755
Net income	32,060,135										32,060,135	32,060,135
Ending balance at Dec. 31, 2012	14,476,947											14,476,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions	6,147,257											6,147,257
Amortization of equity-based compensation	1,739,360											1,739,360
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared	41,110,872											41,110,872
Net income	39,771,822										39,771,822	39,771,822
Ending balance at Dec. 31, 2013	21,024,514											21,024,514
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares	1,000					1,000
Capital contributions	12,405,868											12,405,868
Limited Liability Company (LLC) Members' Equity, Unit-based Compensation	1,487,646											1,487,646
Reclassification of distributions to former members	800,381											800,381
Purchase of former member interests	2,327,548											2,327,548
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared	73,686,241											73,686,241
Issuance of common shares, shares				33
Net income	44,440,902											44,440,902
Ending balance at Nov. 04, 2014	6,337,818					1,000						0
Ending balance, shares at Nov. 04, 2014				33
Beginning balance at Nov. 03, 2014	8,801,618					1,000						8,800,618
Beginning balance, shares at Nov. 03, 2014				33
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, shares		6,000,000
Net income	-17,711,945											-17,711,945
Other adjustments related to Reorganization and IPO	15,248,145											15,248,145
Ending balance at Nov. 04, 2014	6,337,818					1,000						0
Beginning balance, shares at Nov. 04, 2014				33
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares		95,880,000	0	60,000	428,569		95,820,000	-428,569
Amortization of equity-based compensation	984,344					984,344
Net tax benefit in connection with tax receivable agreements	8,359,984					8,359,984
Issuance of common shares, shares				6,000,000	42,856,854
Purchase of Fifth Street Holdings L.P. limited partner interests	-95,880,000					-95,880,000
IPO costs	-3,881,686					-3,881,686
Net income	12,083,875								528,577	11,555,298
Allocation of Pre IPO Earnings	0								760,418	5,576,400		-6,336,818
Ending balance at Dec. 31, 2014	$23,884,335			$60,000	$428,569	$4,975,073			$1,288,995	$17,131,698
Ending balance, shares at Dec. 31, 2014				6,000,033	42,856,854

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$38,812,832	$39,771,822	$32,060,135
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	752,144	207,794	202,834
Amortization of fractional interests in aircrafts	233,701	29,098	0
Amortization of deferred financing costs	83,888	0	0
Amortization of equity-based compensation	4,953,078	1,739,360	130,504
Compensation charges related to Reorganization and IPO	13,856,529	0	0
Losses on sale and disposal of assets	41,951	0	0
Lease termination charges	657,584	0	0
Income from equity method investments	-246,361	0	0
Deferred taxes	-2,238,810	0	0
Reclassification of distributions to former members	1,919,569	0	0
Fair value adjustment b due to former member	270,538	-89,057	-311,723
Deferred rent	1,281,288	23,971	46,245
Changes in operating assets and liabilities:
Prepaid expenses	-1,007,980	-20,950	161,500
Due from affiliates	48,949	-1,397,005	758,412
Other assets	0	-2,132,757	-4,618
Accounts payable and accrued expenses	909,639	835,138	98,580
Accrued compensation and benefits	10,557,513	-14,429	-749,153
Income taxes payable	361,052	0	0
Net cash provided by operating activities	60,653,136	19,764,348	40,586,021
Cash flows from investing activities
Purchases of fixed assets	-9,506,416	-941,782	-198,837
Purchases of equity method investments	-3,956,813	0	0
Distributions received from equity method investments	87,745	0	0
Purchase of fractional interest in aircraft	-1,763,674	0	0
Net cash used in investing activities	-15,139,158	-941,782	-198,837
Cash flows from financing activities
Proceeds from sale of Class A common shares	1,000	0	0
Proceeds from sale of Class A common shares in Initial Public Offering	95,880,000	0	0
Initial Public Offering costs paid	-3,741,134	0	0
Purchase of limited partner interests in Fifth Street Holdings L.P.	-95,880,000	0	0
Proceeds from loan payable	0	4,000,000	0
Borrowings under credit facility	12,000,000	0	0
Deferred financing costs paid	-2,516,652	0	0
Capital contributions from members	2,222,560	447,640	2,065,664
Distributions to members	-54,257,472	-35,411,255	-29,924,755
Net cash used in financing activities	-46,291,698	-30,963,615	-27,859,091
Net increase (decrease) in cash and cash equivalents	-777,720	-12,141,049	12,528,093
Cash and cash equivalents, beginning of year	4,015,728	16,156,777	3,628,684
Cash and cash equivalents, end of period	3,238,008	4,015,728	16,156,777
Supplemental disclosures of cash flow information:
Cash paid during the year for interest	100,000	11,233	293
Non-cash investing activities:
Fixed asset purchases included in accounts payable	139,671	0	0
Non-cash exchange of other assets	-673,826	0	0
Non-cash financing activities:
Due to Principal and Affiliates for distributions to former members of Predecessor	9,123,108	0	0
Non-cash capital contribution by members	10,183,308	5,699,617	0
Non-cash distribution to members	-19,428,769	-5,699,617	0
Establishment of deferred tax assets related to tax receivable agreements	-55,733,229	0	0
Initial recording of amounts payable to related parties pursuant to tax receivable agreements	47,373,245	0	0
IPO costs included in accounts payable	140,552	0	0
Issuance of Class B common shares	428,569	0	0
Management Fees Receivable [Member]
Changes in operating assets and liabilities:
Management fees receivable	-5,452,024	-18,631,509	8,209,608
Performance Fees Receivable [Member]
Changes in operating assets and liabilities:
Management fees receivable	-106,635	0	0
Former Member [Member]
Changes in operating assets and liabilities:
Due to affiliates	-2,363,975	-896,937	-958,242
Affiliated Entity [Member]
Changes in operating assets and liabilities:
Due to affiliates	($2,671,334)	$339,809	$941,939

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation
	Fifth Street Asset Management Inc. ("FSAM"), together with its consolidated subsidiaries (collectively, the "Company"), is a leading alternative asset management firm headquartered in Greenwich, CT that provides asset management services to its investment funds, which, to date, consist primarily of Fifth Street Finance Corp. (formed on January 2, 2008, "FSC") and Fifth Street Senior Floating Rate Corp. (formed on May 22, 2013, "FSFR"), both publicly-traded business development companies regulated under the Investment Company Act of 1940 (together, the "BDCs"). The Company conducts substantially all of its operations through its consolidated subsidiary, Fifth Street Management LLC ("FSM").
	The accompanying consolidated financial statements include (1) the results of the Company subsequent to the Reorganization as described below and (2) prior to the Reorganization, the financial results of Fifth Street Management Group (the "Predecessor") which includes affiliated entities either wholly or substantially owned and/or under the voting control of Leonard M. Tannenbaum. Historical financial results relating to the Predecessor are presented as net income attributable to Predecessor.
	The Company's primary sources of revenues are management fees, primarily from the BDCs, which are driven by the amount of the assets under management and quarterly investment performance of the funds it manages. The Company conducts substantially all of its operations through one reportable segment which provides asset management services to its alternative investment vehicles. The Company generates all of its revenues in the United States.
	Reorganization
	In anticipation of its initial public offering (the "IPO") that closed November 4, 2014, FSAM was incorporated in Delaware on May 8, 2014 as a holding company with its primary asset expected to be a limited partnership interest in Fifth Street Holdings L.P. ("Fifth Street Holdings"). Fifth Street Holdings was formed on June 27, 2014 by Leonard M. Tannenbaum and another member of FSM (the "Principals") as a Delaware limited partnership. Prior to the transactions described below, the Principals were the general partners and limited partners of Fifth Street Holdings. Fifth Street Holdings has a single class of limited partnership interests (the "Holdings LP Interests"). Immediately prior to the IPO:
	•	The Principals contributed their general partnership interests in Fifth Street Holdings to FSAM in exchange for 100% of the FSAM's Class B common stock;
	•	The members of FSM contributed 100% of their membership interests in FSM to Fifth Street Holdings in exchange for Holdings LP Interests; and
	•	The members of FSCO GP LLC ("FSCO GP"), a Delaware limited liability company, formed on January 6, 2014 to serve as the general partner of Fifth Street Opportunities Fund, L.P. (''FSOF,'' formerly Fifth Street Credit Opportunities Fund, L.P.) contributed 100% of their membership interests in FSCO GP to Fifth Street Holdings in exchange for Holdings LP Interests.
	As a result of the above transactions, FSAM became the general partner of Fifth Street Holdings, which was also organized to be a holding company for FSM and FSCO GP. As a holding company, FSAM conducts all of its operations through FSM and FSCO GP, wholly-owned subsidiaries of Fifth Street Holdings, including the provision of management services to FSC, FSFR and other affiliated private funds. Fifth Street Management Group is the Company's predecessor prior to the IPO.
	In connection with the Reorganization, FSAM entered into the Exchange Agreement with the Fifth Street Holdings Limited Partners that granted each Fifth Street Holdings Limited Partner and certain permitted transferees the right, beginning two years after the closing of the IPO and subject to vesting and minimum retained ownership requirements, on a quarterly basis, to exchange such person's Holdings LP Interests for shares of Class A common stock of FSAM, on a one-for-one basis, subject to customary conversion rate adjustments for splits, unit distributions and reclassifications. As a result, each Fifth Street Holdings Limited Partner, over time, has the ability to convert his or her illiquid ownership interests in Fifth Street Holdings into Class A common stock that can more readily be sold in the public markets.
	These collective actions are referred to herein as the "Reorganization."
	Initial Public Offering
	On November 4, 2014, FSAM issued 6,000,000 shares of Class A common stock in the IPO at a price of $17.00 per common share. The net proceeds totaled $95.9 million after deducting underwriting commissions of $6.1 million and before offering costs of approximately $3.9 million that were borne by FSAM. The net proceeds were used to purchase a 12.0% limited partnership interest in Fifth Street Holdings from its limited partners.
	Immediately following the Reorganization transactions described above and the closing of the IPO on November 4, 2014:
	•	the Principals held 42,856,854 shares of Class B common stock and 42,856,854 Holdings LP Interests, the Holdings Limited Partners, including the Principals, held 44,000,000 Holdings LP Interests and FSAM held 6,000,000 Holdings LP Interests; and
	•	through their holdings of Class B common stock, the Principals, in the aggregate, had approximately 97.3% of the voting power of FSAM's common stock.
	FSAM's purchase of Holdings LP Interests concurrent with its IPO, and the subsequent and future exchanges by holders of Holdings LP Interests for shares of FSAM's Class A common stock pursuant to the Exchange Agreement is expected to result in increases in its share of the tax basis of the tangible and intangible assets of Fifth Street Holdings, which will increase the tax depreciation and amortization deductions that otherwise would not have been available to FSAM. These increases in tax basis and tax depreciation and amortization deductions are expected to reduce the amount of cash taxes that FSAM would otherwise be required to pay in the future. FSAM has entered into a tax receivable agreement ("TRA") with certain limited partners of Fifth Street Holdings (the "TRA Recipients") that requires it to pay them 85% of the amount of cash savings, if any, in U.S. federal, state, local and foreign income tax that FSAM actually realizes (or, under certain circumstances, is deemed to realize) as a result of the increases in tax basis in connection with exchanges by the TRA Recipients described above and certain other tax benefits attributable to payments under the tax receivable agreement.
	In connection with the above transactions, the previous members of FSM agreed to allocate to the limited partners of Fifth Street Holdings and FSAM the Company's earnings (excluding the compensation charges related to the Reorganization) from October 1, 2014 through the date of the IPO.
	Basis of Presentation
	The Consolidated Financial Statements and related notes have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") as set forth in the Financial Accounting Standards Board's ("FASB") Accounting Standards Codification ("ASC") and Regulation S-X. All significant intercompany transactions and balances have been eliminated in consolidation.
	Prior to the completion of the IPO, the historical Consolidated Financial Statements consist of the combined results of Fifth Street Management Group which includes affiliated entities either wholly or substantially owned and/or under the voting control of Leonard M. Tannenbaum at the time of the Reorganization and IPO.  As such, FSAM's acquisition of its 12% membership interest in Fifth Street Holdings and related Reorganization have been accounted for as transactions among entities under common control, pursuant to ASC 805-50, and recorded on a historical cost basis.
	After the completion of the IPO, FSAM is the general partner of Fifth Street Holdings and owns a 12.0% limited partnership interest in Fifth Street Holdings. Accordingly, Fifth Street Holdings and its wholly-owned subsidiaries (including FSM) will be consolidated in FSAM's financial statements. The Company has presented the Consolidated Statements of Income after giving effect to the Reorganization as of January 1, 2012, the first day of the earliest period presented in the consolidated financial statements. All amounts attributable to the Company's Predecessor are recorded as "Net income attributable to Predecessor" within the consolidated financial statements. Subsequent to November 4, 2014, 88.0% of the net income attributable to Fifth Street Holdings limited partnership interests are recorded as "net income attributable to non-controlling interests in Fifth Street Holdings."
	On October 13, 2014, FSAM effectuated a 1-for-3 reverse stock split. All share information has been retroactively adjusted to reflect the reverse stock split.
	Deconsolidation of Combined Funds
	During the year ended December 31, 2014, the Company formed the following entities (collectively referred to as the “Combined Funds”) whose financial results were included in the Company’s combined financial statements in previous filings with the Securities and Exchange Commission:
	•	FSCO GP, a Delaware limited liability company, formed on January 6, 2014 to serve as the general partner of Fifth Street Opportunities Fund, L.P. ("FSOF," formerly Fifth Street Credit Opportunities Fund, L.P.), which primarily invests in yield-oriented corporate credit assets and equities;
	•	Fifth Street EIV, LLC ("Fifth Street EIV"), a Delaware limited liability company formed on February 7, 2014 to hold FSM's equity interest in Fifth Street Senior Loan Fund I, LLC ("SLF I"), which primarily invests in senior secured loans to middle-market companies; and
	•	Fifth Street EIV II, LLC ("Fifth Street EIV II"), a Delaware limited liability company formed on July 10, 2014 to hold certain of the Company's employees' equity interests in Fifth Street Senior Loan Fund II, LLC ("SLF II"), which primarily invests in senior secured loans to middle-market companies.
	Such Combined Funds were included in the financial statements based on the then existing consolidation guidance. In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis ("ASU 2015-02"), as discussed in Note 2. The Company has elected to early adopt such guidance in these consolidated financial statements, which resulted in deconsolidation of the Combined Funds. The Company determined that these entities were variable interest entities and that the Company was not the primary beneficiary because under ASU 2015-02 the Company's fee arrangements are commensurate with the level of effort performed and include only customary terms do not represent variable interests. Also see Note 2 for the related disclosures for certain unconsolidated variable interest entities. There was no gain or loss recognized as a result of the deconsolidation of the Combined Funds. Although total assets and equity significantly decreased as a result of the Combined Funds' deconsolidation, it did not change net income or equity attributable to controlling interests in FSAM. The Company will continue to earn management and/or performance fees from these funds. See Note 14 for a presentation of the quarterly impacts related to the deconsolidation of the Combined Funds.
	Revision of Statement of Cash Flows for the Year Ended December 31, 2013
	The Company identified a revision to its previously issued 2013 combined financial statements resulting from the presentation of noncash capital contributions and noncash distributions to members of approximately $5,700,000 within cash flows from financing activities rather than as noncash financing activities. The revision to correct the presentation had no net effect on cash flows from financing activities or cash and cash equivalents.
	The Company reviewed this item utilizing SEC Staff Accounting Bulletin No. 99, “Materiality” (“SAB 99”) and determined that the impact was immaterial. The accompanying 2013 consolidated financial statements reflect the correction of this item.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and entities in which it, directly or indirectly, is determined to have a controlling financial interest under ASC 810, as amended by ASU No. 2015-02. Under the variable interest model, the Company determines whether, if by design, an entity has equity investors who lack substantive participating or kick-out rights. If equity investors do not have such rights, the entity is considered a variable interest entity ("VIE") and must be consolidated by its primary beneficiary. An enterprise is determined to be the primary beneficiary if it holds a controlling financial interest. A controlling financial interest is defined as (a) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and (b) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. The consolidation guidance requires an analysis to determine (a) whether an entity in which the Company holds a variable interest is a VIE and (b) whether the Company's involvement, through holding interests directly or indirectly in the entity, would give it a controlling financial interest. Performance of that analysis requires the exercise of judgment.
	Under the consolidation guidance, the Company determines whether it is the primary beneficiary of a VIE at the time it becomes involved with a variable interest entity and reconsiders that conclusion continually. In evaluating whether the Company is the primary beneficiary, the Company evaluates its economic interests in the entity held either directly by the Company and its affiliates or indirectly through employees. The consolidation analysis can generally be performed qualitatively; however, if it is not readily apparent that the Company is not the primary beneficiary, a quantitative analysis may also be performed. Investments and redemptions (either by the Company, affiliates of the Company or third parties) or amendments to the governing documents of the respective investment funds could affect an entity's status as a VIE or the determination of the primary beneficiary. At each reporting date, the Company assesses whether it is the primary beneficiary and will consolidate or deconsolidate accordingly.
	For equity investments where the Company does not control the investee, and where it is not the primary beneficiary of a variable interest entity, but can exert significant influence over the financial and operating policies of the investee, the Company follows the equity method of accounting. The evaluation of whether the Company exerts control or significant influence over the financial and operational policies of its investees requires significant judgment based on the facts and circumstances surrounding each individual investment. Factors considered in these evaluations may include the type of investment, the legal structure of the investee, the terms and structure of the investment agreement, including investor voting or other rights, the terms of the Company's advisory agreement or other agreements with the investee, any influence the Company may have on the governing board of the investee, the legal rights of other investors in the entity pursuant to the fund’s operating documents and the relationship between the Company and other investors in the entity.
	Consolidated Variable Interest Entities
	FSAM is the sole general partner of Fifth Street Holdings and, as such, it operates and controls all of the business and affairs of Fifth Street Holdings and its wholly-owned subsidiaries, FSM and FSCO GP. Under ASC 810, Fifth Street Holdings meets the definition of a variable interest entity because the limited partners do not hold substantive kick-out or participating rights. Since FSAM has the obligation to absorb expected losses that could be significant to Fifth Street Holdings and holds 97.3% of the voting power, FSAM is considered to be the primary beneficiary of Fifth Street Holdings.
	As a result, the Company consolidates the financial results of Fifth Street Holdings and its wholly-owned subsidiaries and records a non-controlling interest for the economic interest in Fifth Street Holdings held by the limited partners as a separate component of stockholders' equity in its Consolidated Statements of Financial Condition for the remaining economic interests in Fifth Street Holdings. The non-controlling interest in the income of Fifth Street Holdings is included in the Consolidated Statements of Income as a reduction of net income.
	As of December 31, 2014, the Company has recorded the following amounts in its Consolidated Statements of Financial Condition relating to Fifth Street Holdings:
	Assets
	Cash and cash equivalents	$	3,236,830
	Management fees receivable	26,861,787
	Performance fees receivable	106,635
	Prepaid expenses	1,150,013
	Investments in equity method investees	4,115,429
	Due from affiliates (1)	8,369,501
	Fixed assets, net	10,274,263
	Deferred tax assets	2,705,934
	Deferred financing costs	2,432,764
	Other assets	4,197,358
	Total assets	$	63,450,514
	Liabilities
	Accounts payable and accrued expenses	$	2,830,053
	Accrued compensation and benefits	11,095,548
	Loan payable	4,000,000
	Due to Principal	9,063,791
	Credit facility payable	12,000,000
	Due to affiliates (2)	747,505
	Deferred rent liability	3,261,434
	Total liabilities	42,998,331
	Equity	20,452,183
	Total liabilities and equity	$	63,450,514
	_____________
	(1) The amounts due from affiliates include $4,569,959 that is eliminated in consolidation.
	(2) The amounts due to affiliates include $684,724 that is eliminated in consolidation.
	The liabilities recognized as a result of consolidating Fifth Street Holdings do not represent additional claims on FSAM’s general assets; rather, they represent claims against the specific assets of Fifth Street Holdings and its subsidiaries. Conversely, assets recognized as a result of consolidating Fifth Street Holdings do not represent additional assets that could be used to satisfy claims against FSAM's general assets.
	Unconsolidated Variable Interest Entities
	The Company holds interests in certain VIEs that are not consolidated because the Company is not deemed the primary beneficiary as of December 31, 2014. The Company's interest in such entities generally is in the form of direct equity interests and fixed fee arrangements. The maximum exposure to loss represents the potential loss of assets by the Company relating to these non-consolidated entities. The Company's interests in these non-consolidated VIEs and their respective maximum exposure to loss relating to non-consolidated VIEs as of December 31, 2014, including capital commitments, is $4,115,429.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions affecting amounts reported in the consolidated financial statements and accompanying notes. The most significant of these estimates are related to: (i) the valuation of equity-based compensation, (ii) the estimate of future taxable income, which impacts the carrying amount of the Company’s deferred income tax assets and (iii) the determination of net tax benefits in connection with the Company's tax receivable agreements. These estimates are based on the information that is currently available to the Company and on various other assumptions that the Company believes to be reasonable under the circumstances. Actual results could differ materially from those estimates under different assumptions and conditions.
	Concentration of Credit Risk and Other Risks and Uncertainties
	Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The Company maintains its cash and cash equivalents with high-credit quality financial institutions.
	For the years ended December 31, 2014, 2013 and 2012, 100% of revenues and receivables were earned or derived from advisory or administrative services provided to the BDCs and other affiliated entities.
	The Company is dependent on its chief executive officer, Leonard M. Tannenbaum, who also owns 91.2% of the voting interests in the Company through his Class B common stock shares. If for any reason the services of the Company's chief executive officer were to become unavailable, there could be a material adverse effect on the Company's operations, liquidity and profitability.
	Fair Values of Financial Instruments
	The carrying amounts of cash and cash equivalents, management and performance fees receivable from affiliates, prepaid expenses, due from/to affiliates, accounts payable and accrued expenses, accrued compensation and benefits and income taxes payable approximate fair value due to the immediate or short-term maturity of these financial instruments.
	Cash and Cash Equivalents
	Cash equivalents include short-term, highly liquid investments that are readily convertible to known amounts of cash and have original maturities of three months or less. The Company places its cash and cash equivalents with U.S. financial institutions and, at times, amounts may exceed federally insured limits. The Company monitors the credit standing of these financial institutions.
	Investments in Equity Method Investees
	Investments in equity method investees consists of the Company's interests in unconsolidated VIEs. Entities and investments over which the Company exercises significant influence but which do not meet the requirements for consolidation are accounted for using the equity method of accounting, whereby the Company records its share of the underlying income or losses of these entities. Intercompany profit arising from transactions with affiliates is eliminated to the extent of its beneficial interest. Equity in losses of equity method investments is not recognized after the carrying value of an investment, including advances and loans, has been reduced to zero, unless guarantees or other funding obligations exist.
	The Company evaluates its equity method investments for impairment, whenever events or changes in circumstances indicate that the carrying amounts of such investments may not be recoverable. The difference between the carrying value of the equity method investment and its estimated fair value is recognized as an impairment when the loss in value is deemed other than temporary. No impairment charges related to equity method investments were recorded during the years ended December 31, 2014, 2013 and 2012.
	The primary equity method investment of the Company is an equity interest in SLF I, a senior loan fund which was previously consolidated.
	Fixed Assets
	Fixed assets consist of furniture, fixtures and equipment (including automobiles, computer hardware and software) and leasehold improvements, and are recorded at cost, less accumulated depreciation and amortization. Depreciation of furniture, fixtures and equipment is computed using the straight-line method over the estimated useful lives of the respective assets (three to eight years). Amortization of improvements to leased properties is computed using the straight-line method based upon the initial term of the applicable lease or the estimated useful life of the improvements, whichever is shorter, and ranges from five to 10 years. Routine expenditures for repairs and maintenance are charged to expense when incurred. Major betterments and improvements are capitalized. Upon retirement or disposition of fixed assets, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recognized in the Consolidated Statements of Income. The Company evaluates fixed assets for impairment whenever events or changes in circumstances indicate that an asset's carrying value may not be fully recovered. During the years ended December 31, 2014, 2013 and 2012, there were no impairments recognized.
	Deferred Financing Costs
	Deferred financing costs consist of fees and expenses paid in connection with the closing of Fifth Street Holdings' credit facility and are capitalized at the time of payment. Deferred financing costs are amortized using the straight line method over the term of the credit facility and are included in interest expense Company's Consolidated Statements of Income.
	Deferred Rent
	The Company recognizes rent expense on a straight-line basis over the expected lease term. Within the provisions of certain leases, there are free rent periods and escalations in payments over the base lease term. The effects of these items have been reflected in rent expense on a straight-line basis over the expected lease term. Landlord contributions and tenant allowances are included in the straight-line calculations and are being deferred over the lease term and are reflected as a reduction in rent expense.
	Revenue Recognition
	The Company has three principal sources of revenues: management fees, performance fees and other fees. These revenues are derived from the Company's agreements with the funds it manages, primarily the BDCs. The advisory agreements on which revenues are based are generally renewable on an annual basis by the general partner or the board of directors of the respective funds.
	Management Fees
	Management fees are generally based on a defined percentage of fair value of assets, total commitments, invested capital, net asset value, net investment income, total assets or par value of the investment portfolios managed by the Company. All management fees are earned from affiliated funds of the Company. The contractual terms of management fees vary by fund structure and investment strategy and range from 0.40% to 2.00% for base management fees, which are asset or capital-based.
	Management fees from affiliates also include quarterly incentive fees on the net investment income from the BDCs ("Part I Fees"). Part I Fees are generally equal to 20.0% of the BDCs' net investment income (before Part I Fees and performance fees payable based on capital gains), subject to fixed "hurdle rates" as defined in the respective investment advisory agreement. No fees are recognized until the BDCs' net investment income exceeds the respective hurdle rate, with a "catch-up" provision that serves to ensure the Company receives 20% of the BDCs' net investment income from the first dollar earned. Such fees are classified as management fees as they are paid quarterly, predictable and recurring in nature, not subject to repayment (or clawback) and cash settled each quarter. Management fees from affiliates are recognized as revenue in the period advisory services are rendered, subject to the Company's assessment of collectability.
	Performance Fees
Performance fees are earned from the funds managed by the Company based on the performance of the respective funds. The contractual terms of performance fees vary by fund structure and investment strategy and are generally 15.0% to 20.0%.
The Company has elected to adopt Method 2 of ASC 605-20, Revenue Recognition for Revenue Based on a Formula. Under this method, the Company records revenue when it is entitled to performance-based fees, subject to certain hurdles or benchmarks. The performance fees for any period are based upon an assumed liquidation of the fund's net assets on the reporting date, and distribution of the net proceeds in accordance with the fund's income allocation provisions. The performance fees may be subject to reversal to the extent that the performance fees recorded exceed the amount due to the general partner or investment manager based on a fund's cumulative investment returns.
Performance fees related to the BDCs ("Part II Fees") are calculated and payable in arrears as of the end of each fiscal year of the BDCs and equal 20% of the BDCs' realized capital gains, if any, on a cumulative basis since inception, computed net of all realized capital losses and unrealized capital depreciation on a cumulative basis, less the aggregate amount of any previously paid capital gain incentive fees.
Other Fees
The Company also provides administrative services to the BDCs and private funds and the fees earned are reported within Revenues — Other fees. These fees generally represent the portion of compensation, overhead and other expenses incurred by the Company directly attributable to the funds, but may also be based on a fund's asset value. The Company selects the vendors, incurs the expenses, and is the primary obligor under the related arrangements. Such reimbursement is at cost with no profit to, or markup by, the Company. The Company is considered the principal under these arrangements and is required to record the expense and related reimbursement revenue on a gross basis. Other fees are recognized in the periods during which the related expenses are incurred and the reimbursements are contractually earned.
Compensation and Benefits
Compensation generally includes salaries, bonuses and equity-based compensation charges. Bonuses are accrued over the service period to which they relate. All payments made to the Predecessor's managing member since inception and all payments made to the Predecessor's equity members since December 1, 2012 (see Note 11) related to their granted or purchased interests are accounted for as distributions on the equity held by such members.
Equity-Based Compensation
The Company accounts for stock-based compensation in accordance with ASC 718, “Compensation – Stock Compensation.” Under the fair value recognition provision of this guidance, share-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period.
The Company recognizes expense related to equity-based compensation transactions in which it receives employee services in exchange for: (a) equity instruments of the Company or (b) liabilities that are based on the fair value of the Company's equity instruments. Equity-based compensation expense represents expenses associated with the: (i) granting of Part I Fee-sharing arrangements prior to the Reorganization; (ii) conversion of and acceleration in vesting of interests in the Predecessor in connection with the Reorganization, and (iii) the granting of restricted stock units, options to purchase Class A common shares and stock appreciation rights granted in connection with the IPO.
Stock-based compensation expense recognized during the years ended December 31, 2014, 2013 and 2012 is based on awards ultimately expected to vest and has been reduced for estimated forfeitures. ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The effect of such change in estimated forfeitures is recognized through a cumulative catch-up adjustment that is included in the period of the change in estimate.
The value of the portion of the award that is ultimately expected to vest on a straight-line basis over the requisite service period is included within compensation and benefits (except for grants to non-employees which are included in general, administrative and other expenses) in the Company’s Consolidated Statements of Income.
The Company records deferred tax assets or liabilities for equity compensation plan awards based on deductions for income tax purposes of stock-based compensation recognized at the statutory tax rate in the jurisdiction in which the Company is expected to receive a tax deduction. In addition, differences between the deferred tax assets recognized for financial reporting purposes and the actual tax deduction reported on the Company's income tax returns are recorded as adjustments to additional paid-in capital. If the tax deduction is less than the deferred tax asset, the calculated shortfall reduces the pool of excess tax benefits. If the pool of excess tax benefits is reduced to zero, then subsequent shortfalls would increase the income tax expense.
Reimbursable Expenses
In the normal course of business, the Company pays certain expenses on behalf of the BDCs, primarily for professional travel and other costs associated with particular portfolio company holdings of the BDCs, for which it is reimbursed. Such expenses are not an obligation of the Company and are recorded as due from affiliates at the time of disbursement (see Note 10).
Fund Offering and Start-up Expenses
In certain instances, the Company may bear offering costs related to capital raising activities of the BDCs, including underwriting commissions, which are expensed as incurred. In addition, the Company expenses all costs associated with starting new investment funds. Included in the Consolidated Statement of Income for the year ended December 31, 2014, is approximately $822,000 of expenses associated with a follow-on equity offering of FSC. Included in the Consolidated Statement of Income for the year ended December 31, 2013 is approximately $5,700,000 of expenses associated with the initial public offering of FSFR.
Income Taxes
Prior to the completion of the IPO, substantially all of the Company's earnings flowed through to the former members of FSM without being subject to entity level income taxes. Accordingly, no provision for income taxes has been recorded in the consolidated financial statements prior to the IPO.
Fifth Street Holdings complies with the requirements of the Internal Revenue Code that are applicable to limited partnerships, which allow for the complete pass-through of taxable income or losses to Fifth Street Holdings limited partners, including FSAM, who are individually responsible for any federal tax consequences. Subsequent to the IPO, the tax provision includes the federal income tax obligation related to FSAM's allocated portion of Fifth Street Holdings' income. Fifth Street Holdings is subject to certain state and local taxes.
The Company accounts for income taxes under the asset and liability method prescribed by ASC 740, "Income Taxes." As a result of the Company's acquisition of limited partnership interests in Fifth Street Holdings, the Company expects to benefit from amortization and other tax deductions reflecting the step-up in tax basis in the acquired assets. Those deductions will be used by the Company and will be taken into account in determining the Company's taxable income. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Management periodically assesses the recoverability of its deferred tax assets based upon expected future earnings, future deductibility of the asset and changes in applicable tax laws and other factors. If management determines that it is not probable that the deferred tax asset will be fully recoverable in the future, a valuation allowance may be established for the difference between the asset balance and the amount expected to be recoverable in the future. The allowance will result in a charge to the Company’s Consolidated Statements of Income. Further, the Company records its income taxes receivable and payable based upon its estimated income tax liability.
The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs.
The Company recognizes interest and penalties associated with tax matters such as franchise tax liabilities, if applicable, as general and administrative and other expenses.
Class A Earnings per Share
The Company computes basic earnings per share attributable to FSAM’s Class A common stockholders by dividing income attributable to FSAM by the weighted-average common shares outstanding for the period. Diluted earnings per share reflects the potential dilution beyond shares for basic earnings per share that could occur if securities or other contracts to issue common stock were exercised, converted into common stock, or resulted in the issuance of common stock that would have shared in the Company's earnings. Potentially dilutive securities include outstanding options to acquire Class A common shares, unvested restricted stock units and Fifth Street Holdings limited partnership interests which are exchangeable for Class A common shares. The dilutive effect of stock options and restricted stock units is reflected in diluted earnings per Class A common share by application of the treasury stock method.
Under the treasury stock method, if the average market price of a Class A common share increases above the option's exercise price, the proceeds that would be assumed to be realized from the exercise of the option would be used to acquire outstanding Class A common shares. The dilutive effect of awards is directly correlated with the fair value of the Class A common shares. However, the awards may be anti-dilutive when the market price of the underlying shares exceeds the option's exercise price. This result is possible because the compensation expense attributed to future services but not yet recognized is included as a component of the assumed proceeds upon exercise.
Reclassifications
Certain reclassifications of prior period amounts have been made to conform to the current period presentation.  Such amounts did not impact results of operations, cash flows or earnings per share.
Recent Accounting Pronouncements
In June 2013, the FASB issued ASU 2013-08, Financial Services — Investment Companies ("ASU 2013-08"). ASU 2013-08 provides clarifying guidance to determine if an entity qualifies as an investment company. ASU 2013-08 also requires an investment company to measure non-controlling interests in other investment companies at fair value. The following disclosures are required by ASU 2013-08: (i) whether an entity is an investment company and is applying the accounting and reporting guidance for investment companies; (ii) information about changes, if any, in an entity's status as an investment company; and (iii) information about financial support provided or contractually required to be provided by an investment company to any of its investees. The requirements of ASU 2013-08 were adopted by the Company beginning in the first quarter of 2014. There are no changes to the current requirements relating to the retention of specialized accounting in the financial statements of a non-investment company parent. These updates did not have a material impact on the Company's financial condition or results of operations.
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The new standard will be effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of this standard on its consolidated financial statements and its ongoing financial reporting.
In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the requisite service period, which clarifies the recognition of stock-based compensation over the required service period, if it is probable that the performance condition will be achieved. This guidance will be effective for fiscal years, and interim periods within those years, beginning after December 15, 2015 and should be applied prospectively. The Company is currently evaluating the effect that this guidance will have on its consolidated financial statements and its ongoing financial reporting.
In August 2014, the FASB issued ASU No. 2014-13, Measuring the Financial Assets and Financial Liabilities of a Consolidated Collateralized Financing Entity ("CFE"). This new guidance requires reporting entities to use the more observable of the fair value of the financial assets or the financial liabilities to measure the financial assets and the financial liabilities of a CFE when a CFE is initially consolidated. It permits entities to make an accounting policy election to apply this same measurement approach after initial consolidation or to apply other GAAP to account for the consolidated CFE's financial assets and financial liabilities. It also prohibits all entities from electing to use the fair value option in ASC 825 to measure either the financial assets or financial liabilities of a consolidated CFE that is within the scope of this issue. This guidance is effective for fiscal years beginning after December 15, 2015, and interim periods therein. Early adoption is permitted using a modified retrospective transition approach as described in the pronouncement. The Company is currently evaluating the effect that this guidance will have on its consolidated financial statements and its ongoing financial reporting.
In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern, which requires management to evaluate, at each annual and interim reporting period, the company's ability to continue as a going concern within one year of the date the financial statements are issued and provide related disclosures. This accounting guidance is effective for the Company on a prospective basis beginning in the first quarter of fiscal 2016 and is not expected to have a material effect on the consolidated financial statements.
In February 2015, the FASB issued ASU 2015-02, which provides guidance on evaluating whether a reporting entity should consolidate certain legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are VIEs. Under this analysis, limited partnerships and other similar entities will be considered a VIE unless the limited partners hold substantive kick-out rights or participating rights. Further, the amendments eliminate the presumption that a general partner should consolidate a limited partnership under the voting interest model, as well as affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. ASU 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. A reporting entity may apply the amendments using a modified retrospective approach or a full retrospective application. The Company has elected to early adopt such guidance in these consolidated financial statements which resulted in deconsolidation of the Combined Funds. Although total assets and equity significantly decreased as a result of the Combined Funds' deconsolidation, it did not change net income or equity attributable to controlling interests in FSAM.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	ASC 820 – Fair Value Measurements and Disclosures ("ASC 820") – defines fair value as the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A liability's fair value is defined as the amount that would be paid to transfer the liability to a new obligor, not the amount that would be paid to settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available or reliable, valuation techniques are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the investments or market and the investments' complexity.
	Assets and liabilities recorded at fair value in the Company's consolidated financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value.
	Hierarchical levels, defined by ASC 820 and directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, are as follows:
	•	Level 1 — Unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.
	•	Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data at the measurement date for substantially the full term of the assets or liabilities.
	•	Level 3 — Unobservable inputs that reflect management's best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.
	The Company did not have any financial instruments carried at fair value as of December 31, 2014.
	The following table presents the financial instruments carried at fair value as of December 31, 2013, by caption on the Company's Consolidated Statement of Financial Condition for each of the levels of hierarchy established by ASC 820:
	Liability		Level 1			Level 2			Level 3				Total
	Due to former member		$	—		$	—		$	2,093,437			$	2,093,437
	When a determination is made to classify a financial instrument within Level 3 of the valuation hierarchy, the determination is based upon the fact that the unobservable factors are the most significant to the overall fair value measurement. However, Level 3 financial instruments typically include, in addition to the unobservable or Level 3 components, observable components (that is, components that are actively quoted and can be validated by external sources). Accordingly, the appreciation (depreciation) in the tables below includes changes in fair value due in part to observable factors that are part of the valuation methodology.
	The following tables provide a roll-forward of the changes in fair value of assets and liabilities for which the Company determines fair value using unobservable (Level 3) factors for the three months ended December 31, 2014:
			Due to Former Members
			31-Dec-14			31-Dec-13
	Fair value at beginning of period		$	2,093,437		$	3,079,431
	Current period additions		1,799,423			—
	Current period payments		(4,163,398		)	(896,937		)
	Fair value adjustments		270,538			(89,057		)
	Fair value at end of period		$	—		$	2,093,437
	Significant Unobservable Inputs for Level 3 Financial Instruments
	The following tables provide quantitative information related to the significant unobservable inputs for Level 3 liabilities, which were carried at fair value as of December 31, 2013:
	Liability		Fair Value			Valuation Technique		Unobservable Input	Range		Weighted Average
	Due to former member		$	2,093,437		Discounted cash		Discount rate	10%		10%
						flow approach
								Part I Fee estimated	$2,269,621 -		$	2,269,621
								future payments	$2,269,621
	Total		$	2,093,437
	Under the discounted cash flow approach the significant unobservable inputs are the Part I Fee estimated future payments. Significant increases or decreases in this input in isolation may result in a significantly higher or lower fair value measurement, respectively. The discount rate is fixed by contract and not subject to change.
	Financial Instruments Disclosed, But Not Carried At Fair Value
	The following table presents the carrying value and fair value of the Company's financial assets and liabilities disclosed, but not carried, at fair value as of December 31, 2014 and the level of each financial asset and liability within the fair value hierarchy:
			Carrying			Fair Value			Level 1				Level 2		Level 3
			Value
	Investments in equity method investees		$	4,115,429		$	4,115,429		$	—			$	—	$	4,115,429
	Loan payable		4,000,000			4,049,110			—				—		4,049,110
	Credit facility payable		12,000,000			12,000,000			—				—		12,000,000
	Notes payable included in Due to Principal		5,564,451			5,564,451			—				—		5,564,451
	Payables to related parties pursuant to tax receivable agreements		47,373,245			42,352,014			—				—		42,352,014
	Total		$	73,053,125		$	68,081,004		$	—			$	—	$	68,081,004
	The following table presents the carrying value and fair value of the Company's financial liabilities disclosed, but not carried, at fair value as of December 31, 2013 and the level of each financial liability within the fair value hierarchy:
			Carrying			Fair Value			Level 1				Level 2		Level 3
			Value
	Loan payable		$	4,000,000		$	4,000,000		$	—			$	—	$	4,000,000
	The carrying values of the Company's investments in equity method investees approximates fair value as the investees' assets are carried at fair value. The Company utilizes a bond yield approach to estimate the fair value of its loan payable, which is included in Level 3 of the hierarchy. Under the bond yield approach, the Company uses its incremental borrowing rate to determine the present value of the future cash flows streams related to the liability.
	The carrying values of the credit facility payable and the notes payable included in Due to Principal approximate their fair value and are included in Level 3 of the hierarchy.
	The Company utilizes a discounted cash flow approach to estimate the fair value of its payables to related parties pursuant to tax receivable agreements, which is included in Level 3 of the hierarchy. Under the discounted cash flow approach, the Company estimates the present value of estimated future tax benefits pursuant to the tax receivable agreement discounted using a market interest rate.

Due_from_Affiliates

Due from Affiliates	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Due from Affiliates	Due from Affiliates
	In connection with administration agreements that are in place (see Note 10), the Company provides certain administrative services for the BDCs and private funds, including office facilities and equipment, and clerical, bookkeeping and recordkeeping services at such facilities.  For providing these services, facilities and personnel, the BDCs and private funds reimburse the Company for direct fund expenses and the BDCs reimburse the Company for the allocable portion of overhead and other expenses incurred by the Company in performing its obligations under the administration agreements.
	Also, in the normal course of business, the Company pays certain expenses on behalf of the BDCs, primarily for travel and other costs associated with particular portfolio company holdings of the BDCs, for which it is reimbursed.  Such expenses are not obligations of the Company and are recorded as due from affiliates at the time of disbursement (see Note 10).  Also included in due from affiliates at December 31, 2013 was $1,760,000 from the landlord of the Company's corporate headquarters.  Such amount was received in June 2014.

Fixed_Assets

Fixed Assets	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Fixed Assets	Fixed Assets
	Fixed assets consist of the following:
		31-Dec-14			December 31, 2013
	Furniture, fixtures and equipment	$	3,563,172		$	1,568,550
	Leasehold improvements	7,864,805			111,779
	Construction in progress	—			698,568
	Fixed assets, cost	11,427,977			2,378,897
	Less: accumulated depreciation and amortization	(1,153,714		)	(942,216		)
	Fixed assets, net book value	$	10,274,263		$	1,436,681
	Construction in progress relates to the Company's new corporate headquarters located in Greenwich, CT which was completed in July 2014, at which time the Company took possession of the premises. In connection with the related lease, the landlord (a related party — see Note 10) contributed $1,760,000 towards the construction, which totaled approximately $7,700,000.
	Depreciation and amortization expense related to fixed assets for the years ended December 31, 2014, 2013 and 2012 was $752,144, $207,794 and $202,834, respectively.

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets
	Other assets consist of the following:
			31-Dec-14		31-Dec-13
	Security deposits		$	453,375	$	953,375
	Fractional interests in aircrafts (a)		3,585,283		1,540,900
	Other		158,700		158,700
			$	4,197,358	$	2,652,975
	__________________
	(a)	In November 2013, the Company entered into an agreement that entitled it to the use of a corporate aircraft for five years. The amount paid, less the estimated trade-in value, is being amortized on a straight-line basis over the expected five-year term of the agreement. In December 2014, the Company sold half of this interest for total consideration of $673,826 and recorded a gain on disposal of $14,410. In connection with the sale, the Company entered into an agreement for a second corporate aircraft for five years. Amortization expense for the years ended December 31, 2014 and 2013 was $233,701 and $29,098, respectively.

Due_to_Former_Members

Due to Former Members	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Due to Former Members	Due to Former Members
	On November 5, 2010, the Company entered into a separation agreement with a member that provided for (i) the repurchase of the member's pro rata share of Part I Fees based on a formula, as defined in the agreement, over a five year period ending on September 30, 2015, and (ii) upon the closing of a sale transaction of the Company, the allocation by the managing member to the former member of any proceeds from the sale up to a maximum of $6,000,000. Accordingly, the Company recorded a liability for the present value of the expected future payments of the member's pro rata share of Part I Fees as of the date of the agreement and adjusted this liability to fair value at each reporting date. Included in compensation expense for the years ended December 31, 2014, 2013 and 2012 were fair value adjustments related to this liability that increased (decreased) compensation expense in the amounts of $270,358, $(89,057) and $(311,723), respectively. As of December 31, 2014, all amounts due to this former member have been paid. Amounts due to this former member totaled $2,093,437 at December 31, 2013.
	In addition, the Company recognized compensation expense in the amount of $144,000 upon the closing of the IPO representing the fair value of the former member's vested equity-based awards. The amount of $5,856,000 paid to the former member in excess of fair value of the award was accounted for as a distribution with a corresponding offset to members' equity.
	On May 17, 2014, the Company entered into a separation agreement with a member that provided for (i) the repurchase of the member's pro rata share of Part I Fees for $1,713,802, and (ii) upon the closing of a sale transaction of the Company, the allocation by the managing member to the former member of a portion of net proceeds from the sale. In connection with the agreement to repurchase the former member's interest, the Company recognized compensation expense in the amount of $2,599,803, representing the amount paid and the reclassification of amounts previously recorded as distributions since December 1, 2012, as the award was forfeited prior to vesting. In addition, the Company recognized compensation expense in the amount of approximately $2,327,548 in connection with the reallocation to the managing member of the former member's forfeited interest. Such amount represents the fair value of the interest in the amount of $4,035,926, as determined by an independent third party appraisal, net of the cash paid.
	Related Party Transactions
	Due to Principal
	On October 29, 2014, the Company issued notes payable to a Principal in the amount of $5,564,451 representing an initial estimate of the undistributed earnings of the Predecessor as of the IPO. Such notes bear interest at 1.0% per annum and are due no later than June 30, 2015. As of December 31, 2014, the Company has accrued an additional $3,499,341 representing the finalization of the amount of undistributed earnings of the Predecessor to the Principal as of the IPO.
	Payments Pursuant to Tax Receivable Agreements
	As of December 31, 2014, the Company recorded a liability of $47,373,245, representing the payments due to the TRA Recipients under the TRA.
	Within the next 12 month period, the Company expects to pay $343,621 of the total amount of the estimated TRA liability. To determine the current amount of the payments due to the TRA Recipients, the Company estimated the amount of taxable income that FSAM generated from October 1, 2014 through December 31, 2014. Next, the Company estimated the amount of the specified deductions subject to the TRA which are expected to be realized by FSAM in its 2014 tax return. This amount was then used as a basis for determining the Company's increase in estimated tax cash savings as a result of such deductions on which a current TRA obligation became due (i.e. payable within 12 months of the Company's year-end). These calculations are performed pursuant to the terms of the TRAs.
	Payments are anticipated to be made under the TRAs indefinitely, and are due within 45 calendar days after the date FSAM files its federal income tax return. The payments are to be made in accordance with the terms of the TRAs. The timing of the payments is subject to certain contingencies including the Company having sufficient taxable income to utilize all of the tax benefits defined in the TRAs.
	Obligations pursuant to the TRAs are obligations of FSAM. They do not impact the non-controlling interests in Fifth Street Holdings. These obligations are not income tax obligations and have no impact on the tax provision or the allocation of taxes. In general, items of income, gain, loss and deduction are allocated on the basis of the limited partners' ownership interests pursuant to the Fifth Street Holdings limited partnership agreement after taking into consideration all relevant sections of the Internal Revenue Code.
	Other Related Party Transactions
	All of the Company's revenue is earned from its affiliates, including management fees, performance fees and other fees.
	For the years ended December 31, 2014, 2013 and 2012, the Company earned $94,838,783, $68,308,323 and $49,520,198, respectively, in management fees relating to services provided to the BDCs. As of December 31, 2014 and 2013, management fees receivable in the amounts of $26,508,013 and $21,409,763, are due from the BDCs. For the years ended December 31, 2014 and December 31, 2013, the Company voluntarily waived $952,945 and $2,321,986 of management fees to the BDCs, respectively. For the year ended December 31, 2012, there were no management fees waived by the Company.
	Performance fees earned for the year ended December 31, 2014 totaled $106,635. No performance fees were earned during the years ended December 31, 2013 and 2012.
	The Company also has entered into administration agreements under which the Company provides administrative services for the BDCs and private funds ("Fifth Street Funds"), including office facilities and equipment, and clerical, bookkeeping and recordkeeping services at such facilities. Under the administration agreements, the Company also performs or oversees the performance of the BDCs' required administrative services, which includes being responsible for the financial records which the BDCs are required to maintain and preparing reports to the BDCs' stockholders and reports filed with the Securities and Exchange Commission. In addition, the Company assists each of the BDCs in determining and publishing its net asset value, overseeing the preparation and filing of its tax returns and the printing and dissemination of reports to the each of the BDC's stockholders, and generally overseeing the payment of each Fifth Street Fund's expenses and the performance of administrative and professional services rendered to the funds. For providing these services, facilities and personnel, the Fifth Street Funds reimburse the Company for direct fund expenses and the BDCs reimburse the Company for the allocable portion of overhead and other expenses incurred by the Company in performing its obligations under the administration agreements, including rent and such BDC's allocable portion of the costs of compensation and related expenses of such BDC's chief financial officer and chief compliance officer and their staffs. Such reimbursement is at cost with no profit to, or markup by, the Company. Included in Revenues — other fees in the Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012 were $7,674,019, $5,204,820 and $4,636,865, respectively, related to amounts charged for the above services provided to the Fifth Street Funds. The Company may also provide, on the BDCs' behalf, managerial assistance to such BDC's portfolio companies. Each of the administration agreements may be terminated by either the Company or the BDC without penalty upon 60 days' written notice to the other party.
	Receivables for reimbursable expenses are included within due from affiliates and totaled $3,723,160 and $2,060,367 at December 31, 2014 and December 31, 2013, respectively.
	On July 22, 2013, the Company entered into a lease agreement for office space for its headquarters in Greenwich, CT. The landlord is an entity controlled by the managing member. The lease agreement requires monthly rental payments at market rates, expires on September 30, 2024 and can be renewed at the request of the Company for two additional five year periods. Rental payments under this lease of approximately $2,000,000 per year began on October 11, 2014.
	The Company's fractional interests in corporate aircrafts are used primarily for business purposes. Occasionally, certain of the members have used the aircraft for personal use. The Company charges these members for such personal use based on market rates. Such charges were not material for the years ended December 31, 2014, 2013 and 2012.
	Included in due to affiliates at December 31, 2013 is $2,542,333 related to cash held by the Company in connection with a liability of an affiliated fund. Such amount was returned to the affiliate in June 2014. Also included in due to affiliates at December 31, 2013 was $129,001 related to purchased interests of non-equity members of FSM (see Note 11).
	As of December 31, 2014 and 2013 amounts due to and from affiliates were comprised of the following:
		31-Dec-14		31-Dec-13
	Management fees receivable:
	Base management fees receivable - BDCs	$	15,200,933	$	12,355,341
	Part I Fees receivable - BDCs	11,307,080		9,054,422
	Collateral management fees receivable - SLF I and SLF II	351,274		—
	Management fees receivable - FSOF	2,500		—
		$	26,861,787	$	21,409,763
	Performance fees receivable:
	Performance fees receivable - FSOF	$	106,635	$	—
		$	106,635	$	—
	Due from affiliates:
	Reimbursed expenses due from the BDCs	$	3,596,975	$	2,060,367
	Reimbursed expenses due from private funds	126,185		—
	Due from members for personal use of corporate aircraft	—		11,359
	Due from employees	59,489		14,672
	Due from landlord for construction costs	—		1,760,000
	Other amounts due from affiliated entities	16,893		2,093
		$	3,799,542	$	3,848,491
	Due to affiliates:
	Distribution payable to former members of Predecessor	$	59,316	$	—
	SARs liability	3,465		—
	Cash held on behalf of Fifth Street Mezzanine Partners II, L.P.	—		2,542,333
	Due to non-equity members for purchase of interests	—		129,001
		$	62,781	$	2,671,334

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	Debt
	Loan Payable
	On October 7, 2013, the Company borrowed $4,000,000 from the Department of Economic and Community Development (the "DECD") of the State of Connecticut. Proceeds from the loan were utilized to partially fund the build-out costs of the Company's new headquarters in Greenwich, CT. The loan bears interest at a fixed rate of 2.5% per annum, matures on November 21, 2023 and requires interest-only payments through November 1, 2017, at which point monthly payments of principal and interest are required until maturity or such time that the loan is repaid in full. As security for the loan, the Company has granted the State of Connecticut a blanket interest in the Company's personal property, subject only to prior security interests permitted by the State of Connecticut. For the years ended December 31, 2014 and 2013, interest expense related to this loan in the amounts of $100,000 and $11,233 are included in interest and other income (expense) in the Consolidated Statements of Income.
	Outstanding principal amounts related to this loan maturing over the next five years are as follows:
	2015	$	—
	2016	—
	2017	51,551
	2018	627,050
	2019	642,908
	Under the terms of the agreement, the Company may be eligible for forgiveness of up to $3,000,000 of the principal amount of the loan based on certain job creation milestones, as mutually agreed to by the Company and the DECD. If the Company is unable to meet these job creation milestones within the allotted timeframe, the DECD may impose a penalty upon the Company in an amount equal to $78,125 per job below the required amount. To date, no penalties have been assessed by the DECD.
	In addition, as part of the agreement with the DECD, the Company is eligible to receive up to $500,000 to fund a job training program that is jointly developed based on the Company's training needs, as well as up to $500,000 for the installation of a fuel cell, wind or solar powered energy system at the Company's Connecticut headquarters. The Company applied for and received both grants as of December 31, 2014.
	Credit Facility
	On November 4, 2014, Fifth Street Holdings entered into an unsecured revolving credit facility which matures on November 4, 2019 with certain lenders party thereto from time to time and Sumitomo Mitsui Banking Corporation, as administrative agent and joint lead arranger, and Morgan Stanley Senior Funding, Inc., as syndication agent and joint lead arranger. The revolving credit facility provides for $176 million of borrowing capacity, with a $100 million accordion feature, and bears interest at a variable rate based on either LIBOR or a base rate plus an applicable margin with an unused commitment fee paid quarterly, which is subject to change based on a total leverage ratio. Borrowings under the revolving credit facility accrue interest at an annual rate of LIBOR plus 2.00% per annum and the unused commitment fee under the facility is 0.30% per annum. The revolving credit facility contains customary affirmative and negative covenants for agreements of this type, including financial maintenance requirements, delivery of financial and other information, compliance with laws, further assurances and limitations with respect to indebtedness, liens, fundamental changes, restrictive agreements, dispositions of assets, acquisitions and other investments, conduct of business and transactions with affiliates. The revolving credit facility has a term of five years. As of December 31, 2014, the Company had $12,000,000 of borrowings outstanding under the credit facility which had a fair value of $12,000,000.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Leases
	The Company leases office space in various locations throughout the United States and maintains its headquarters in Greenwich, CT. On July 22, 2013, the Company entered into a lease agreement with a related party (see Note 10) for office space in Greenwich, CT that expires on September 30, 2024. Other non-cancelable office leases in other locations expire through 2019. The Company's rental lease agreements are generally subject to escalation provisions on base rental payments, as well as certain costs incurred by the property owner and are recognized on a straight-line basis over the term of the lease agreements.
	Future minimum lease payments for operating leases with original or remaining non-cancelable lease terms in excess of one year as of December 31, 2014 are as follows:
	For the year ended December 31,
	2015	$	3,007,716
	2016	2,242,874
	2017	2,212,135
	2018	2,260,129
	2019	2,167,000
	Thereafter	10,890,000
		$	22,779,854
	Rent expense for the years ended December 31, 2014, 2013 and 2012 was $3,963,909, $1,093,947 and $956,615, respectively, and is included in general, administrative and other expenses in the Consolidated Statements of Income.
	In July 2014, the Company terminated the operating lease for its White Plains, NY office. Under the terms of the agreement with the landlord, the Company paid an early termination fee of $616,852 and is obligated to pay rent through November 30, 2015. Accordingly, the Company has recognized an additional expense in the amount of $460,658 representing the fair value of the remaining lease obligation.
	In August 2014, the Company sublet its former office in Greenwich, CT. In connection therewith, the Company has recognized an expense in the amount of $196,926 representing the fair value of the remaining lease obligation.
	Guarantee
	On August 1, 2013, two subsidiaries of the Company entered into an agreement whereby they guaranteed a commercial mortgage loan in the amount of $26,000,000 issued by a financial institution to an entity owned by the managing member. This guarantee was terminated on September 24, 2014.
	401(k) Plan
	The Company sponsors a 401(k) plan under which all full time employees are eligible to participate after three months of service. Employees may contribute a portion of their eligible compensation subject to certain limits based on Federal tax laws. The Company makes matching contributions based on the amount of each employee's eligible compensation contributed to the plan, subject to plan and legal limits. Employees begin to vest in the matching contributions after two years of employment and become fully vested in the matching contributions after six years of employment. Included in compensation and benefits in the accompanying Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012 are Company matching contributions in the amounts of $589,660, $268,854 and $166,553, respectively.
	Capital Commitments
	As of December 31, 2014, the Company does not have any unfunded capital commitments.
	Litigation
	From time to time, the Company may be involved in litigation and claims incidental to the conduct of the Company's business. The Company may also be subject, from time to time, to reviews, inquiries and investigations by regulatory agencies that have regulatory authority over the Company's business activities. The Company is currently not subject to any pending judicial, administrative or arbitration proceedings that are expected to have a material impact on the Company's consolidated results of operations or financial condition.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Due to Former Members
	On November 5, 2010, the Company entered into a separation agreement with a member that provided for (i) the repurchase of the member's pro rata share of Part I Fees based on a formula, as defined in the agreement, over a five year period ending on September 30, 2015, and (ii) upon the closing of a sale transaction of the Company, the allocation by the managing member to the former member of any proceeds from the sale up to a maximum of $6,000,000. Accordingly, the Company recorded a liability for the present value of the expected future payments of the member's pro rata share of Part I Fees as of the date of the agreement and adjusted this liability to fair value at each reporting date. Included in compensation expense for the years ended December 31, 2014, 2013 and 2012 were fair value adjustments related to this liability that increased (decreased) compensation expense in the amounts of $270,358, $(89,057) and $(311,723), respectively. As of December 31, 2014, all amounts due to this former member have been paid. Amounts due to this former member totaled $2,093,437 at December 31, 2013.
	In addition, the Company recognized compensation expense in the amount of $144,000 upon the closing of the IPO representing the fair value of the former member's vested equity-based awards. The amount of $5,856,000 paid to the former member in excess of fair value of the award was accounted for as a distribution with a corresponding offset to members' equity.
	On May 17, 2014, the Company entered into a separation agreement with a member that provided for (i) the repurchase of the member's pro rata share of Part I Fees for $1,713,802, and (ii) upon the closing of a sale transaction of the Company, the allocation by the managing member to the former member of a portion of net proceeds from the sale. In connection with the agreement to repurchase the former member's interest, the Company recognized compensation expense in the amount of $2,599,803, representing the amount paid and the reclassification of amounts previously recorded as distributions since December 1, 2012, as the award was forfeited prior to vesting. In addition, the Company recognized compensation expense in the amount of approximately $2,327,548 in connection with the reallocation to the managing member of the former member's forfeited interest. Such amount represents the fair value of the interest in the amount of $4,035,926, as determined by an independent third party appraisal, net of the cash paid.
	Related Party Transactions
	Due to Principal
	On October 29, 2014, the Company issued notes payable to a Principal in the amount of $5,564,451 representing an initial estimate of the undistributed earnings of the Predecessor as of the IPO. Such notes bear interest at 1.0% per annum and are due no later than June 30, 2015. As of December 31, 2014, the Company has accrued an additional $3,499,341 representing the finalization of the amount of undistributed earnings of the Predecessor to the Principal as of the IPO.
	Payments Pursuant to Tax Receivable Agreements
	As of December 31, 2014, the Company recorded a liability of $47,373,245, representing the payments due to the TRA Recipients under the TRA.
	Within the next 12 month period, the Company expects to pay $343,621 of the total amount of the estimated TRA liability. To determine the current amount of the payments due to the TRA Recipients, the Company estimated the amount of taxable income that FSAM generated from October 1, 2014 through December 31, 2014. Next, the Company estimated the amount of the specified deductions subject to the TRA which are expected to be realized by FSAM in its 2014 tax return. This amount was then used as a basis for determining the Company's increase in estimated tax cash savings as a result of such deductions on which a current TRA obligation became due (i.e. payable within 12 months of the Company's year-end). These calculations are performed pursuant to the terms of the TRAs.
	Payments are anticipated to be made under the TRAs indefinitely, and are due within 45 calendar days after the date FSAM files its federal income tax return. The payments are to be made in accordance with the terms of the TRAs. The timing of the payments is subject to certain contingencies including the Company having sufficient taxable income to utilize all of the tax benefits defined in the TRAs.
	Obligations pursuant to the TRAs are obligations of FSAM. They do not impact the non-controlling interests in Fifth Street Holdings. These obligations are not income tax obligations and have no impact on the tax provision or the allocation of taxes. In general, items of income, gain, loss and deduction are allocated on the basis of the limited partners' ownership interests pursuant to the Fifth Street Holdings limited partnership agreement after taking into consideration all relevant sections of the Internal Revenue Code.
	Other Related Party Transactions
	All of the Company's revenue is earned from its affiliates, including management fees, performance fees and other fees.
	For the years ended December 31, 2014, 2013 and 2012, the Company earned $94,838,783, $68,308,323 and $49,520,198, respectively, in management fees relating to services provided to the BDCs. As of December 31, 2014 and 2013, management fees receivable in the amounts of $26,508,013 and $21,409,763, are due from the BDCs. For the years ended December 31, 2014 and December 31, 2013, the Company voluntarily waived $952,945 and $2,321,986 of management fees to the BDCs, respectively. For the year ended December 31, 2012, there were no management fees waived by the Company.
	Performance fees earned for the year ended December 31, 2014 totaled $106,635. No performance fees were earned during the years ended December 31, 2013 and 2012.
	The Company also has entered into administration agreements under which the Company provides administrative services for the BDCs and private funds ("Fifth Street Funds"), including office facilities and equipment, and clerical, bookkeeping and recordkeeping services at such facilities. Under the administration agreements, the Company also performs or oversees the performance of the BDCs' required administrative services, which includes being responsible for the financial records which the BDCs are required to maintain and preparing reports to the BDCs' stockholders and reports filed with the Securities and Exchange Commission. In addition, the Company assists each of the BDCs in determining and publishing its net asset value, overseeing the preparation and filing of its tax returns and the printing and dissemination of reports to the each of the BDC's stockholders, and generally overseeing the payment of each Fifth Street Fund's expenses and the performance of administrative and professional services rendered to the funds. For providing these services, facilities and personnel, the Fifth Street Funds reimburse the Company for direct fund expenses and the BDCs reimburse the Company for the allocable portion of overhead and other expenses incurred by the Company in performing its obligations under the administration agreements, including rent and such BDC's allocable portion of the costs of compensation and related expenses of such BDC's chief financial officer and chief compliance officer and their staffs. Such reimbursement is at cost with no profit to, or markup by, the Company. Included in Revenues — other fees in the Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012 were $7,674,019, $5,204,820 and $4,636,865, respectively, related to amounts charged for the above services provided to the Fifth Street Funds. The Company may also provide, on the BDCs' behalf, managerial assistance to such BDC's portfolio companies. Each of the administration agreements may be terminated by either the Company or the BDC without penalty upon 60 days' written notice to the other party.
	Receivables for reimbursable expenses are included within due from affiliates and totaled $3,723,160 and $2,060,367 at December 31, 2014 and December 31, 2013, respectively.
	On July 22, 2013, the Company entered into a lease agreement for office space for its headquarters in Greenwich, CT. The landlord is an entity controlled by the managing member. The lease agreement requires monthly rental payments at market rates, expires on September 30, 2024 and can be renewed at the request of the Company for two additional five year periods. Rental payments under this lease of approximately $2,000,000 per year began on October 11, 2014.
	The Company's fractional interests in corporate aircrafts are used primarily for business purposes. Occasionally, certain of the members have used the aircraft for personal use. The Company charges these members for such personal use based on market rates. Such charges were not material for the years ended December 31, 2014, 2013 and 2012.
	Included in due to affiliates at December 31, 2013 is $2,542,333 related to cash held by the Company in connection with a liability of an affiliated fund. Such amount was returned to the affiliate in June 2014. Also included in due to affiliates at December 31, 2013 was $129,001 related to purchased interests of non-equity members of FSM (see Note 11).
	As of December 31, 2014 and 2013 amounts due to and from affiliates were comprised of the following:
		31-Dec-14		31-Dec-13
	Management fees receivable:
	Base management fees receivable - BDCs	$	15,200,933	$	12,355,341
	Part I Fees receivable - BDCs	11,307,080		9,054,422
	Collateral management fees receivable - SLF I and SLF II	351,274		—
	Management fees receivable - FSOF	2,500		—
		$	26,861,787	$	21,409,763
	Performance fees receivable:
	Performance fees receivable - FSOF	$	106,635	$	—
		$	106,635	$	—
	Due from affiliates:
	Reimbursed expenses due from the BDCs	$	3,596,975	$	2,060,367
	Reimbursed expenses due from private funds	126,185		—
	Due from members for personal use of corporate aircraft	—		11,359
	Due from employees	59,489		14,672
	Due from landlord for construction costs	—		1,760,000
	Other amounts due from affiliated entities	16,893		2,093
		$	3,799,542	$	3,848,491
	Due to affiliates:
	Distribution payable to former members of Predecessor	$	59,316	$	—
	SARs liability	3,465		—
	Cash held on behalf of Fifth Street Mezzanine Partners II, L.P.	—		2,542,333
	Due to non-equity members for purchase of interests	—		129,001
		$	62,781	$	2,671,334

Equity_and_EquityBased_Compens

Equity and Equity-Based Compensation	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Equity and Equity Based Compensation	Equity and Equity Based Compensation
	FSAM Ownership Structure
	Subsequent to the Reorganization and IPO as described in Note 1, FSAM has two classes of common stock, Class A common stock and Class B common stock, which are described as follows:
	Class A common stock
	Holders of shares of Class A common stock are entitled to one vote for each share held of record on all matters submitted to a vote of stockholders. Additionally, holders of shares of Class A common stock are entitled to receive dividends when and if declared by the Board of Directors, subject to any statutory or contractual restrictions on the payment of dividends and to any restrictions on the payment of dividends imposed by the terms of any outstanding preferred stock.
	Upon dissolution, liquidation or the sale of all or substantially all of the Company's assets, after payment in full of all amounts required to be paid to creditors and to the holders of preferred stock having liquidation preferences, if any, the holders of shares of Class A common stock would be entitled to receive the Company's remaining assets available for distribution on pro rata basis.
	Holders of shares of Class A common stock do not have preemptive, subscription, redemption or conversion rights.
	Class B common stock
	Holders of Class B common stock are entitled to five votes for each share held of record on all matters submitted to a vote of stockholders. Shares of Class B common stock have voting but no economic rights and were issued in equal proportion to the number of Holdings LP Interests issued in the Reorganization to the Principals.
	Holders of Class B common stock will not have any right to receive dividends (other than dividends consisting of shares of Class B common stock or in rights, options, warrants or other securities convertible or exercisable into or exchangeable for shares of Class B common stock paid proportionally with respect to each outstanding share of Class B common stock) or to receive a distribution upon the dissolution, liquidation or sale of all or substantially all of the Company's assets with respect to their Class B common stock other than the par value of the Class B common stock held.
	FSAM's amended and restated certificate of incorporation does not provide for any restrictions on transfer of shares of Class B common stock, however, in the event that an outstanding share of Class B common stock ceases to be held by a holder of a corresponding Holdings LP Interest, such share shall automatically be retired and cancelled. In addition, when a Holdings LP Interest is exchanged for a share of Class A common stock by a Principal, the corresponding share of Class B common stock will be retired and cancelled.
	Allocation of pre-IPO Earnings
	In connection with the IPO, the previous members of FSM agreed to allocate to the limited partners of Fifth Street Holdings, including FSAM, the Company's earnings (excluding the compensation charges related to the Reorganization) from October 1, 2014 through the date of the IPO.
	Dividends
	As of December 31, 2014, FSAM had not paid nor declared any dividends. On January 15, 2015, the Company's Board of Directors declared an initial quarterly dividend of $0.30 per share on its Class A common stock. The declared dividend will be payable on April 15, 2015 to stockholders of record at the close of business on March 31, 2015.
	Equity-based Compensation
	Prior to the Reorganization, the Company historically had fee sharing arrangements whereby certain employees or members were granted interests to a share of Part I Fees. Upon consummation of the Reorganization such interests were exchanged for Holdings LP Interests. In addition, upon consummation of the IPO, the Company granted certain equity instruments to Holdings limited partners, employees and directors.
	Part I Fees
	Prior to December 1, 2012, interests in the Company's Part I Fees that were granted and/or sold to members (other than the managing member) were accounted for as liabilities using the intrinsic-value method as these interests are subject to repurchase in the event of the member's termination of employment, at a formula-based price (as defined in the then existing operating agreement) determined by the member's pro rata share of Part I Fees. In addition, the redemption amounts were exclusive of any accumulated undistributed earnings associated with the member's interests, which were also required to be paid to a former member. Accordingly, payments to these members from January 1, 2012 through December 1, 2012 in the amount of $2,811,576 were accounted for as compensation expense in the Consolidated Statement of Income for the year ended December 31, 2012.
	Effective December 1, 2012, the operating agreement was amended to include a retirement eligibility vesting clause for then existing members (“equity members”). Members admitted after December 1, 2012, were considered non-equity members as their interests did include the retirement eligibility clause and were accounted for as liabilities using the intrinsic-value method consistent with the above. The amounts paid by the equity members prior to December 1, 2012 for these interests, totaling $2,065,664, which had been accounted for as a liability, were reclassified to members' equity with payments subsequent to December 1, 2012 being accounted for as distributions from equity. The fair value of these awards at that date in the amount of $15,187,787, net of cash paid for the awards, as determined by an independent third party appraisal, was amortized on a straight-line basis over the period to retirement eligibility. Included in compensation expense for the years ended December 31, 2014, 2013 and 2012 was $3,965,269, $1,739,360 and $130,504, respectively, of amortization relating to these equity-classified awards.
	During the period from January 1, 2012 through November 4, 2014, the following transactions were consummated with respect to Part I Fees:
	•	On January 3, 2012, the then managing member sold a portion of his Part I Fee to three employees for $308,910. Such transactions occurred prior to the addition of the retirement eligibility clause and, accordingly, were accounted for as a liability with a corresponding distribution to the managing member. Effective December 1, 2012, these employees became equity members and the amounts paid for their interests were reclassified to members' equity. Accordingly, distributions in the amount of $144,808 for the period from January 1, 2012 through December 1, 2012 are included in compensation expense.
	•	On March 1, 2012, the managing member sold a portion of his Part I Fee to an employee for $374,034. Such transaction occurred prior to the addition of the retirement eligibility clause and, accordingly, was accounted for as a liability with a corresponding distribution to the managing member. Effective December 1, 2012, this employee became an equity member and the amount paid for the interest was reclassified to members' equity. Accordingly, distributions in the amount of $54,285 for the period from January 1, 2012 through December 1, 2012 are included in compensation expense.
	•	On January 1, 2013, the managing member sold a portion of his Part I Fee to an employee for $82,141. Such interest did not include the retirement eligibility clause and was accounted for as a liability as discussed above and the employee was then considered a "non-equity member." The amount paid by the non-equity member, which was refundable upon termination of employment after completing six years of service, was included in due to affiliates with a corresponding distribution to the managing member. On April 1, 2013, the managing member granted an additional Part I Fee to this same non-equity member. Such interest did not include the retirement eligibility clause and was accounted for as a liability as discussed above. Accordingly, distributions for the years ended December 31, 2014 and 2013 in the amounts of $68,721 and $52,569, respectively, are included in compensation expense.
	•	On April 1, 2013, the managing member granted a Part I Fee to an employee. Such interest did not include the retirement eligibility clause and was accounted for as a liability as discussed above and the employee was considered a non-equity member. Accordingly, distributions for the years ended December 31, 2014 and 2013 in the amounts of $103,423 and $59,959, respectively, are included in compensation expense.
	•	On April 1, 2013, the managing member granted additional Part I Fees to two equity members. As the interests include the retirement eligibility clause, they were accounted for as equity awards. The fair value of the awards at that date in the amount of $184,213, net of cash paid for the awards, as determined by an independent third party appraisal, was amortized on a straight-line basis over the period to retirement eligibility. Included in compensation expense for the years ended December 31, 2014 and 2013 is $9,931 and $11,917, respectively, of amortization relating to these equity-classified awards.
	•	On July 17, 2013, the Company sold additional Part I Fees to seven equity members for a total of $505,597. As the interests included the retirement eligibility clause, they were accounted for as equity awards. The fair value of the awards at that date in the amount of $3,639,150 (net of subsequent forfeitures in the amount of $325,587), net of cash paid for the awards, as determined by an independent third party appraisal, was amortized on a straight-line basis over the period to retirement eligibility. Included in compensation expense for the years ended December 31, 2014 and 2013 is $323,107 and $161,401, respectively, of amortization relating to these equity-classified awards.
	•	On July 17, 2013, the Company sold additional Part I Fees to two non-equity members and two employees for a total of $46,860. Such interests did not include the retirement eligibility clause and was accounted for as liabilities as discussed above. Accordingly, distributions for the years ended December 31, 2014 and 2013 in the amounts of $48,779 and $154,813, respectively, are included in compensation expense.
	•	On December 31, 2013, the then managing member sold a portion of his Part I Fees to an equity member for $350,000. As the interest included the retirement eligibility clause, it was accounted for as an equity award. The amount paid was accounted for as a capital contribution with a corresponding distribution to the managing member. The fair value of the award at that date, net of cash paid for the award, in the amount of $40,726, as determined by an independent appraisal, was amortized on a straight-line basis over the period to retirement eligibility which is expected to be approximately 12 years.
	•	On December 31, 2013, the managing member and another member sold a portion of their Part I Fees to an equity member for $56,800. As the interest includes the retirement eligibility clause, it has been accounted for as an equity award. The amount paid by the equity member has been accounted for as a capital contribution with corresponding distributions to the managing member and the equity member. The fair value of the award at that date in the amount of $735,800, net of cash paid for the award, as determined by an independent third party appraisal, is being amortized on a straight-line basis over the period to retirement eligibility which is expected to be approximately 12 years. Included in compensation expense for the year ended December 31, 2014 is $55,403 of amortization relating to these equity-classified awards.
	•	On January 1, 2014, the members, on a pro rata basis, sold a portion of their Part I Fees to an employee for $14,129. Such interest did not include the retirement eligibility clause and was accounted for as a liability as discussed above. Accordingly, distributions for the year ended December 31, 2014 in the amount of $8,391, are included in compensation expense.
	Conversion and Vesting of Member Interests in Predecessor
	On November 4, 2014, in connection with the Reorganization, existing interests held by the members of the Predecessor (Part I fee-sharing arrangements discussed above) were exchanged for Holdings LP Interests. As part of this exchange, one of the members' Holdings LP Interests became immediately vested and expensed in full and the other members' vesting was modified and their Holdings LP Interests now vest over a period of eight years from the IPO. There was no change in the fair value of these converted interests as a result of the modification in vesting. As a result, the Company recognized a compensation charge in the amount of $14,975,717 related to the modification of these awards in the year ended December 31, 2014.
	The following table summarizes activity for the years ended December 31, 2014, 2013 and 2012 with respect to the Company's equity classified awards:
	Balance at December 31, 2011	$	—
	Fair value of granted and purchased interests	17,253,451
	Reclassification from liability-based awards	(2,065,664		)
	Amortization of granted and purchased interests	(130,504		)
	Balance at December 31, 2012	15,057,283
	Fair value of granted and purchased interests	5,925,572
	Cash received for purchased interests	(1,000,097		)
	Amortization of granted and purchased interests	(1,739,360		)
	Balance at December 31, 2013	18,243,398
	Fair value of purchased interest	4,035,926
	Cash received for purchased interest	(1,708,378		)
	Amortization of granted and purchased interests	(3,965,269		)
	Balance at November 4, 2014	16,605,677
	Impact of conversion and change in vesting of member interests in Predecessor	(8,391,490		)
	Amortization of Holdings LP Interests	(171,129		)
	Balance at December 31, 2014	$	8,043,058
	Included in compensation expense for the years ended December 31, 2014, 2013 and 2012 was $1,808,850, $1,739,360 and $130,504, respectively, of amortization relating to the above equity-classified awards.
	As of December 31, 2014, unrecognized compensation cost in the amount of $8,043,058 relating to these equity-based awards is expected to be recognized over a period of approximately 7.83 years.
	The following table summarizes activity for the year ended December 31, 2014, 2013 and 2012 with respect to the Company's liability classified awards:
	Balance at December 31, 2011	$	1,382,720
	Cash received for purchased interests	682,944
	Compensation expense	2,729,961
	Payment of liabilities	(2,729,961		)
	Reclassification to equity-based awards	(2,065,664		)
	Balance at December 31, 2012	—
	Cash received for purchased interests	129,001
	Compensation expense	123,019
	Payment of liabilities	(123,019		)
	Balance at December 31, 2013	129,001
	Cash received for purchased interests	14,129
Compensation expense	228,140
Payment of liabilities	(228,140		)
Impact of conversion of member interests in Predecessor	(143,130		)
Issuance of stock appreciation rights - see below	3,465
Balance at December 31, 2014	$	3,465
Fifth Street Asset Management Inc. 2014 Omnibus Incentive Plan
In connection with the IPO, FSAM's Board of Directors adopted the 2014 Omnibus Incentive Plan pursuant to which the Company granted options to acquire 5,658,970 Class A common shares, 1,174,748 restricted stock units to be settled in Class A common shares and 90,500 stock appreciation rights to be settled in cash.
Equity-based compensation expense, net of assumed forfeitures is included in the following table:
		Year Ended December 31, 2014
Restricted stock units to be settled in Class A common stock		$	429,626
Options to acquire shares of Class A common stock		383,589
Stock appreciation rights to be settled in cash		3,465
Total		$	816,680
Restricted Stock Units
Each restricted stock unit represents an unfunded, unsecured right of the holder to receive a Class A common share on the vesting dates. The restricted stock units will not vest for three years and subsequently vest at a rate of one-third per year on the fourth, fifth and sixth anniversary of the grant date. These awards will become saleable at a rate of one-quarter (¼) per year, beginning on the sixth, seventh, eighth and ninth anniversary of the grant date. Upon vesting, shares of Class A common stock will be delivered to the participant.
Additionally, if the Company pays dividends on its outstanding shares of Class A common stock, the holder of the restricted stock units will be credited with dividend equivalents.  For stock dividends, the dividend equivalents will be in the form of additional restricted stock units. For cash dividends, the dividend equivalents will be in the form of cash (without interest or earnings).  Dividend equivalents are subject to the same terms and conditions as the original restricted stock unit award, and are not paid until the vesting and settlement of the underlying shares of Class A common stock to which such dividend equivalents relate.
The following table presents unvested restricted stock units' activity during the period from November 4, 2014 through December 31, 2014:
		Restricted Units			Weighted Average Grant Date Fair
					Value Per Unit
Balance - November 4, 2014		—			$	—
Granted - IPO		1,174,748			17
Granted - Post-IPO		—			—
Vested		—			—
Forfeited		—			—
Balance - December 31, 2014		1,174,748			$	17
No restricted stock units vested during the period from November 4, 2014 through December 31, 2014. The total compensation expense expected to be recognized in all future periods associated with the restricted stock units, considering assumed annual forfeitures of 5.0%, is $15,036,895 at December 31, 2014, which is expected to be recognized over the remaining weighted average period of 5.83 years.
Options
Each option entitles the holders to purchase from the Company, upon exercise thereof, one Class A common share at the stated exercise price. Since all of the options granted either restrict saleability upon vesting or have strike prices in excess of the IPO price, the use of standard option pricing models such as Black-Scholes is precluded by ASC 718. As such, the Company has utilized a Monte Carlo pricing simulation, a statistical pricing technique or similar method to measure the fair value of option awards on the date of grant. The following table provides summary information and significant assumptions for each tranche of options granted:
		Class of Option Grants
		Employees				Officers				Non-employee Directors
Number of options granted		3,894,968				1,714,002				50,000
Strike price		$	18.7			$	18.7			$	18.7
Contractual term		10 years				5 years				5 years
Expected dividend yield		7.06		%		7.06		%		7.06		%
Expected volatility		29.5		%		29.5		%		29.5		%
Risk-free rate		2.3		%		1.53		%		1.53		%
Grant date fair value		$	1.78			$	1.67			$	1.62
The 3,894,968 stock options with a ten year contractual term will not vest for three years and subsequently vest and become exercisable at a rate of one-third on the fourth, fifth and sixth anniversary of the grant date. These awards will become saleable at a rate of one-quarter (¼) per year, beginning on the sixth, seventh, eighth and ninth anniversary of the grant date. The grant date fair value of the awards in the amount of $6,933,043 will be charged to compensation expense ratably over the six year service period. The 1,714,002 stock options with a five year contractual term will vest over two years, with one-half (½) of the award vesting on the first and second anniversary of the grant date. The 50,000 stock options with a five year contractual term will vest immediately prior to the first annual meeting of the Company's stockholders. Upon the vesting of both of the five year grants, the options are exercisable with no sale restrictions. The grant date fair value of the awards in the amount of $2,943,383 will be charged to compensation expense ratably over the applicable service period. The fair value measurements of these grants are based on the IPO price of $17.00 per share of Class A common stock.
A summary of unvested options activity during the period from November 4, 2014 through December 31, 2014 is presented below:
		Options			Weighted Average Exercise Price				Weighted Average Remaining Life (in years)			Aggregate Intrinsic Value
Balance - November 4, 2014		—			$	—			—
Granted - IPO		5,658,970			18.7				8.28
Vested		—			—				—
Forfeited or expired		—			—				—
Balance - December 31, 2014		5,658,970			$	18.7			8.28
Exercisable at December 31, 2014		—			$	—			—			$	—
Expected to vest after December 31, 2014		4,654,091			$	18.7			8.28			$	—
Aggregate intrinsic value represents the value of the Company's closing share price on the last trading day of the year in excess of the weighted average exercise price multiplied by the number of options exercisable or expected to vest. As of December 31, 2014, the Company's closing share price was lower than the weighted average exercise price of the options exercisable or expected to vest. As a result, the options are out of the money and have no intrinsic value.
Compensation expense associated with these options is being recognized on a straight-line basis during the service period of the respective grant. As of December 31, 2014, there was $7,718,058 of total unrecognized compensation expense, net of assumed annual forfeitures of 5.00%, that is expected to be recognized over the remaining weighted average period of 4.58 years.
Stock Appreciation Rights (“SARs”)
Each SAR represents an unfunded, unsecured right of the holder to receive an amount in cash equal to the excess of the closing price of a Class A common share over the exercise price. The SARs terms and conditions are substantially similar to the provisions of the ten year option grants discussed above and had a grant date fair value of $1.78 per unit. Upon vesting, they will be settled in cash. The fair value of the SARs are re-measured each reporting period until settlement and changes in fair value are charged to compensation expense as the SARs vest over the remaining service period. The amount of the adjustment has been derived based on a grant date fair value using the IPO price of $17.00 per share, multiplied by the number of unvested shares, expensed over the six year service period. Additionally, the calculation of the expense assumes a forfeiture rate of 5%. The total compensation expense expected to be recognized in all future periods associated with the SARs, considering assumed forfeitures, is approximately $121,292.
A summary of unvested SARs activity during the period from November 4, 2014 through December 31, 2014 is presented below:
		SARs			Weighted Average Grant Date Fair Value Per Unit
Balance November 4, 2014		—			$	—
Granted - IPO		90,500			1.78
Vested		—			—
Forfeited		—			—
Balance December 31, 2014		90,500			$	1.78

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	Components of the provision (benefit) for income taxes consist of the following:
		Year Ended December 31,
			2014			2013		2012
	Current provision:
	Federal		$	291,530		$	—	$	—
	State and local		69,522			—		—
	Total current expense		361,052			—		—
	Deferred benefit:
	Federal		(1,992,191		)	—		—
	State and local		(246,619		)	—		—
	Total deferred benefit		(2,238,810		)	—		—
	Income tax benefit		$	(1,877,758	)	$	—	$	—
	Prior to November 4, 2014, the Company had not been subject to U.S. Federal income taxes as the Predecessor was organized as a limited liability company. As a result of the Reorganization and IPO, the portion of Fifth Street Holdings income attributable to FSAM is now subject to U.S. Federal, state and local income taxes and is taxed at the prevailing corporate tax rates.
	A reconciliation of the U.S. statutory income tax rate of 34% to the Company's effective tax rate is as follows:
		Year Ended December 31,
			2014			2013		2012
	Provision at Federal statutory tax rate		$	12,557,925		$	—	$	—
	State and local taxes, net of federal benefit		(116,882		)	—		—
	Change in tax status		(1,089,600		)	—		—
	Income attributable to Predecessor not subject to tax		(13,240,665		)	—		—
	Effect of permanent differences		11,464			—		—
	Income tax benefit		$	(1,877,758	)	$	—	$	—
	The Company's effective tax rate includes a rate benefit attributable to the fact that certain of the Company's subsidiaries operate as a series of pass-through entities which are not themselves subject to federal income tax. As a result of the Reorganization, certain subsidiaries were converted from pass-through entities to taxable entities. Accordingly, the portion of the Company's subsidiaries' earnings attributable to non-controlling interests are subject to tax when reported as a component of the non-controlling interests' taxable income on their individual tax returns.
	Deferred income taxes are provided for the effects of temporary differences between the tax basis of an asset or liability and are reported in the accompanying Consolidated Statement of Financial Condition.
	These temporary differences result in taxable or deductible amounts in future years. Details of the Company's deferred tax assets and liabilities are summarized as follows:
			As of December 31,
			2014			2013
	Deferred tax assets:
	Net operating loss carryforwards		$	3,443,350		$	—
	Reserves and accruals		1,649,929			—
	Share-based compensation		340,339			—
	Step-up related to purchase of 12% interest in Fifth Street Holdings		55,312,497			—
	Other		3,320			—
	Total deferred tax assets		60,749,435			—
	Deferred tax liabilities:
	Property and equipment and other long-lived assets		(2,269,026		)	—
	Other		(508,370		)	—
	Total deferred liabilities		(2,777,396		)	—
	Total net deferred tax assets		$	57,972,039		$	—
	Deferred tax assets are primarily the result of an increase in the tax basis of certain intangible assets resulting from FSAM's investment in Fifth Street Holdings. Net deferred tax assets are also recorded related to differences between the financial reporting basis and the tax basis of FSAM's proportionate share of the net assets of Fifth Street Holdings. Based on the Company's historical taxable income and its expected future earnings, management evaluates the uncertainty associated with booking tax benefits and determined that the deferred tax assets are more likely than not to be realized, including evaluation of deferred tax liabilities and the expectation of future taxable income.
	As of December 31, 2014, the Company had net operating loss carryforwards for Federal and state purposes of approximately $8.8 million, portions of which begin to expire in 2034.
	The Company does not believe it has any significant uncertain tax positions. Accordingly, the Company did not record any adjustments or recognize interest expense for uncertain tax positions for the years ended December 31, 2014, 2013 and 2012. In the future, if uncertain tax positions arise, interest and penalties will be accrued and included in the Provision for Income Taxes.
	The Company and its subsidiaries file, or will file, income tax returns in the U.S. federal jurisdiction and various state and local jurisdictions. FSAM will file its initial income tax return for the period from November 4, 2014 through December 31, 2014 by September 15, 2015. Fifth Street Holdings is not subject to federal income taxes as it is a flow-through entity. With respect to state and local jurisdictions, the Company and its subsidiaries are typically subject to examination for four to five years after the income tax returns have been filed.

Earnings_per_Share

Earnings per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings per Share	Earnings Per Share
	Prior to the Reorganization and the IPO, the Company's businesses were conducted through multiple operating businesses rather than a single holding entity. As such, there was no single capital structure upon which to calculate historical earnings per common share information. Accordingly, earnings per Class A common share information has not been presented for historical periods prior to the IPO.
	Basic earnings per share (“EPS”) measures the performance of an entity over the reporting period. Diluted earnings per share measures the performance of an entity over the reporting period while giving effect to all potentially dilutive common shares that were outstanding during the period. The treasury stock method is used to determine the dilutive potential of stock options and restricted stock units.
	The following is a reconciliation of the numerator and denominator used in the basic and diluted EPS calculations (in thousands, except shares and per share information):
		Period from November 4, 2014 through December 31, 2014
	Numerator:
	Net income attributable to Fifth Street Asset Management Inc.	$	528,577
	Denominator for basic and diluted net income per share of Class A common stock:
	Weighted average shares of Class A common stock outstanding	6,000,033
	Earnings per share of Class A common stock:
	Net income attributable to Fifth Street Asset Management Inc. per share of Class A common stock, basic and diluted	$	0.09
	Shares of Class B common stock have no impact on the calculation of net income per share of Class A common stock as holders of Class B common stock do not participate in net income or dividends, and thus, are not participating securities.
	The treasury stock method is used to calculate incremental Class A common shares on potentially dilutive Class A common shares resulting from options and unvested restricted units granted in connection with the IPO. Potentially dilutive securities representing an incremental 1,174,748 restricted stock units and 5,658,970 options to acquire Class A common shares for the period from October 1, 2014 to December 31, 2014 were excluded from the computation of diluted earnings per Class A common share for the period because their impact would have been anti-dilutive.
	The earnings per share calculation excludes the assumed conversion of 44,000,000 Fifth Street Holdings limited partnership interest into Class A common shares as the impact would have been anti-dilutive.

Quarterly_Financial_Informatio

Quarterly Financial Information (unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (unaudited)	Quarterly Financial Information (unaudited)
	Summarized unaudited quarterly results for the years ended December 31, 2014 and 2013 are presented below. For periods prior to the Reorganization and IPO, the financial information reflects the consolidated financial results of the Predecessor and the deconsolidation of the previously Combined Funds as discussed in Note 1:
		For the quarter ended March 31, 2014			Deconsolidation of Combined Funds and Effects of Reorganization			For the quarter ended March 31, 2014 -			For the quarter ended June 30, 2014			Deconsolidation of Combined Funds and Effects of Reorganization			For the quarter ended June 30, 2014 -
								As Adjusted									As Adjusted
	Revenues	$	23,753,029		$	14,336		$	23,767,365		$	23,317,866		$	87,217		$	23,405,083
	Net income	$	14,859,754		$	(371,240	)	$	14,488,514		$	10,968,678		$	(1,908,219	)	$	9,060,459
	Net income attributable to	$	(391,416	)	$	391,416		$	—		$	(872,905	)	$	872,905		$	—
	redeemable non-controlling
	interests in Combined Funds
	Net (income) loss attributable to non-controlling interests in	$	20,176		$	(20,176	)	$	—		$	(1,035,314	)	$	1,035,314		$	—
	Combined Funds
	Net income attributable to	$	—		$	(14,488,514	)	$	(14,488,514	)	$	—		$	(9,060,459	)	$	(9,060,459	)
	Predecessor
	Net income attributable to non-	$	—		$	—		$	—		$	—		$	—		$	—
	controlling interests in Fifth
	Street Holdings L.P.
	Net income attributable to	$	14,488,514		$	(14,488,514	)	$	—		$	9,060,459		$	(9,060,459	)	$	—
	controlling interests in Fifth
	Street Management Group
	Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
	Fifth Street Asset
	Management Inc.
		For the quarter ended September 30, 2014			Deconsolidation of Combined Funds and Effects of Reorganization			For the quarter ended September 30, 2014 -			For the quarter ended December 31, 2014
								As Adjusted
	Revenues	$	25,418,658		$	271,931		$	25,690,589		$	30,343,024
	Net income	$	17,536,869		$	(2,981,758	)	$	14,555,111		$	708,748
	Net income attributable to redeemable non-controlling interests in	$	(1,072,218	)	$	1,072,218		$	—		$	—
	Combined Funds
	Net income attributable to non-controlling interests in Combined	$	(1,909,540	)	$	1,909,540		$	—		$	—
	Funds
	Net income attributable to Predecessor	$	—		$	(14,555,111	)	$	(14,555,111	)	$	11,375,127
	Net (income) loss attributable to non-controlling interests in Fifth	$	—		$	—		$	—		$	(11,555,298	)
	Street Holdings L.P.
	Net income attributable to	$	14,555,111		$	(14,555,111	)	$	—		$	—
	controlling interests in Fifth
	Street Management Group
	Net income attributable to Fifth Street Asset Management Inc.	$	—		$	—		$	—		$	528,577
	Net income per share attributable to Fifth Street Management Inc.										$	0.09
	Class A common stock - Basic and Diluted
	Weighted average shares of Class A common stock outstanding -										6,000,033
	Basic and Diluted
		For the quarter ended March 31, 2013			Effects of Reorganization			For the quarter ended March 31, 2013 -			For the quarter ended June 30, 2013			Effects of Reorganization			For the quarter ended June 30, 2013 -
								As Adjusted									As Adjusted
	Revenues	$	15,752,732		$	—		$	15,752,732		$	16,840,884		$	—		$	16,840,884
	Net income	$	10,250,983		$	—		$	10,250,983		$	10,109,004		$	—		$	10,109,004
	Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
	redeemable non-controlling
	interests in Combined Funds
	Net (income) loss attributable to non-controlling interests in	$	—		$	—		$	—		$	—		$	—		$	—
	Combined Funds
	Net income attributable to	$	—		$	(10,250,983	)	$	(10,250,983	)	$	—		$	(10,109,004	)	$	(10,109,004	)
	Predecessor
	Net income attributable to non-	$	—		$	—		$	—		$	—		$	—		$	—
	controlling interests in Fifth
	Street Holdings L.P.
	Net income attributable to	$	10,250,983		$	(10,250,983	)	$	—		$	10,109,004		$	(10,109,004	)	$	—
	controlling interests in Fifth
	Street Management Group
	Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
	Fifth Street Asset
	Management Inc.
		For the quarter ended September 30, 2013			Effects of Reorganization			For the quarter ended September 30, 2013 -			For the quarter ended December 31, 2013			Effects of Reorganization			For the quarter ended December 31, 2013 -
								As Adjusted									As Adjusted
	Revenues	$	17,645,150		$	—		$	17,645,150		$	23,383,272		$	—		$	23,383,272
Net income	$	4,421,182		$	—		$	4,421,182		$	14,990,653		$	—		$	14,990,653
Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
redeemable non-controlling
interests in Combined Funds
Net (income) loss attributable to non-controlling interests in	$	—		$	—		$	—		$	—		$	—		$	—
Combined Funds
Net income attributable to	$	—		$	(4,421,182	)	$	(4,421,182	)	$	—		$	(14,990,653	)	$	(14,990,653	)
Predecessor
Net income attributable to non-	$	—		$	—		$	—		$	—		$	—		$	—
controlling interests in Fifth
Street Holdings L.P.
Net income attributable to	$	4,421,182		$	(4,421,182	)	$	—		$	14,990,653		$	(14,990,653	)	$	—
controlling interests in Fifth
Street Management Group
Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
Fifth Street Asset
Management Inc.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	The Company's management evaluated subsequent events through the date of issuance of these Consolidated Financial Statements and has determined that the following events require disclosure:
	On December 22, 2014, FSM entered into a limited liability company agreement, as majority member, with the brother of the Company's chief executive officer, as minority member, for the purpose of forming IMME LLC, a Delaware limited liability company (“IMME”). The purpose of IMME is to develop technology related to the financial services industry. FSM made a total capital contribution of $80,000 for an 80% membership interest in IMME. On February 24, 2015, FSM purchased a convertible promissory note (the “IMME Note”) from IMME in an aggregate principal amount of $800,000. The IMME Note bears interest at 8% per annum and matures on August 31, 2016.
	On January 15, 2015, the Company's Board of Directors declared an initial quarterly dividend of $0.30 per share on its Class A common stock. The declared dividend will be payable on April 15, 2015 to stockholders of record at the close of business on March 31, 2015.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Accounting	The Consolidated Financial Statements and related notes have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") as set forth in the Financial Accounting Standards Board's ("FASB") Accounting Standards Codification ("ASC") and Regulation S-X. All significant intercompany transactions and balances have been eliminated in consolidation.
Variable Interest Entities	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and entities in which it, directly or indirectly, is determined to have a controlling financial interest under ASC 810, as amended by ASU No. 2015-02. Under the variable interest model, the Company determines whether, if by design, an entity has equity investors who lack substantive participating or kick-out rights. If equity investors do not have such rights, the entity is considered a variable interest entity ("VIE") and must be consolidated by its primary beneficiary. An enterprise is determined to be the primary beneficiary if it holds a controlling financial interest. A controlling financial interest is defined as (a) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and (b) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. The consolidation guidance requires an analysis to determine (a) whether an entity in which the Company holds a variable interest is a VIE and (b) whether the Company's involvement, through holding interests directly or indirectly in the entity, would give it a controlling financial interest. Performance of that analysis requires the exercise of judgment.
	Under the consolidation guidance, the Company determines whether it is the primary beneficiary of a VIE at the time it becomes involved with a variable interest entity and reconsiders that conclusion continually. In evaluating whether the Company is the primary beneficiary, the Company evaluates its economic interests in the entity held either directly by the Company and its affiliates or indirectly through employees. The consolidation analysis can generally be performed qualitatively; however, if it is not readily apparent that the Company is not the primary beneficiary, a quantitative analysis may also be performed. Investments and redemptions (either by the Company, affiliates of the Company or third parties) or amendments to the governing documents of the respective investment funds could affect an entity's status as a VIE or the determination of the primary beneficiary. At each reporting date, the Company assesses whether it is the primary beneficiary and will consolidate or deconsolidate accordingly.
	For equity investments where the Company does not control the investee, and where it is not the primary beneficiary of a variable interest entity, but can exert significant influence over the financial and operating policies of the investee, the Company follows the equity method of accounting. The evaluation of whether the Company exerts control or significant influence over the financial and operational policies of its investees requires significant judgment based on the facts and circumstances surrounding each individual investment. Factors considered in these evaluations may include the type of investment, the legal structure of the investee, the terms and structure of the investment agreement, including investor voting or other rights, the terms of the Company's advisory agreement or other agreements with the investee, any influence the Company may have on the governing board of the investee, the legal rights of other investors in the entity pursuant to the fund’s operating documents and the relationship between the Company and other investors in the entity.
	Consolidated Variable Interest Entities
	FSAM is the sole general partner of Fifth Street Holdings and, as such, it operates and controls all of the business and affairs of Fifth Street Holdings and its wholly-owned subsidiaries, FSM and FSCO GP. Under ASC 810, Fifth Street Holdings meets the definition of a variable interest entity because the limited partners do not hold substantive kick-out or participating rights. Since FSAM has the obligation to absorb expected losses that could be significant to Fifth Street Holdings and holds 97.3% of the voting power, FSAM is considered to be the primary beneficiary of Fifth Street Holdings.
	As a result, the Company consolidates the financial results of Fifth Street Holdings and its wholly-owned subsidiaries and records a non-controlling interest for the economic interest in Fifth Street Holdings held by the limited partners as a separate component of stockholders' equity in its Consolidated Statements of Financial Condition for the remaining economic interests in Fifth Street Holdings. The non-controlling interest in the income of Fifth Street Holdings is included in the Consolidated Statements of Income as a reduction of net income.
	As of December 31, 2014, the Company has recorded the following amounts in its Consolidated Statements of Financial Condition relating to Fifth Street Holdings:
	Assets
	Cash and cash equivalents	$	3,236,830
	Management fees receivable	26,861,787
	Performance fees receivable	106,635
	Prepaid expenses	1,150,013
	Investments in equity method investees	4,115,429
	Due from affiliates (1)	8,369,501
	Fixed assets, net	10,274,263
	Deferred tax assets	2,705,934
	Deferred financing costs	2,432,764
	Other assets	4,197,358
	Total assets	$	63,450,514
	Liabilities
	Accounts payable and accrued expenses	$	2,830,053
	Accrued compensation and benefits	11,095,548
	Loan payable	4,000,000
	Due to Principal	9,063,791
	Credit facility payable	12,000,000
	Due to affiliates (2)	747,505
	Deferred rent liability	3,261,434
	Total liabilities	42,998,331
	Equity	20,452,183
	Total liabilities and equity	$	63,450,514
	_____________
	(1) The amounts due from affiliates include $4,569,959 that is eliminated in consolidation.
	(2) The amounts due to affiliates include $684,724 that is eliminated in consolidation.
	The liabilities recognized as a result of consolidating Fifth Street Holdings do not represent additional claims on FSAM’s general assets; rather, they represent claims against the specific assets of Fifth Street Holdings and its subsidiaries. Conversely, assets recognized as a result of consolidating Fifth Street Holdings do not represent additional assets that could be used to satisfy claims against FSAM's general assets.
	Unconsolidated Variable Interest Entities
	The Company holds interests in certain VIEs that are not consolidated because the Company is not deemed the primary beneficiary as of December 31, 2014. The Company's interest in such entities generally is in the form of direct equity interests and fixed fee arrangements. The maximum exposure to loss represents the potential loss of assets by the Company relating to these non-consolidated entities.
Use of Estimates	Use of Estimates
	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions affecting amounts reported in the consolidated financial statements and accompanying notes. The most significant of these estimates are related to: (i) the valuation of equity-based compensation, (ii) the estimate of future taxable income, which impacts the carrying amount of the Company’s deferred income tax assets and (iii) the determination of net tax benefits in connection with the Company's tax receivable agreements. These estimates are based on the information that is currently available to the Company and on various other assumptions that the Company believes to be reasonable under the circumstances. Actual results could differ materially from those estimates under different assumptions and conditions.
Concentration of Credit Risk and Other Risks and Uncertainties	Concentration of Credit Risk and Other Risks and Uncertainties
	Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The Company maintains its cash and cash equivalents with high-credit quality financial institutions.
Fair Values of Financial Instruments	Fair Values of Financial Instruments
	The carrying amounts of cash and cash equivalents, management and performance fees receivable from affiliates, prepaid expenses, due from/to affiliates, accounts payable and accrued expenses, accrued compensation and benefits and income taxes payable approximate fair value due to the immediate or short-term maturity of these financial instruments.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash equivalents include short-term, highly liquid investments that are readily convertible to known amounts of cash and have original maturities of three months or less. The Company places its cash and cash equivalents with U.S. financial institutions and, at times, amounts may exceed federally insured limits. The Company monitors the credit standing of these financial institutions.
Investments in Equity Method Investees	Investments in Equity Method Investees
	Investments in equity method investees consists of the Company's interests in unconsolidated VIEs. Entities and investments over which the Company exercises significant influence but which do not meet the requirements for consolidation are accounted for using the equity method of accounting, whereby the Company records its share of the underlying income or losses of these entities. Intercompany profit arising from transactions with affiliates is eliminated to the extent of its beneficial interest. Equity in losses of equity method investments is not recognized after the carrying value of an investment, including advances and loans, has been reduced to zero, unless guarantees or other funding obligations exist.
	The Company evaluates its equity method investments for impairment, whenever events or changes in circumstances indicate that the carrying amounts of such investments may not be recoverable. The difference between the carrying value of the equity method investment and its estimated fair value is recognized as an impairment when the loss in value is deemed other than temporary. No impairment charges related to equity method investments were recorded during the years ended December 31, 2014, 2013 and 2012.
	The primary equity method investment of the Company is an equity interest in SLF I, a senior loan fund which was previously consolidated.
Fixed Assets	Fixed Assets
	Fixed assets consist of furniture, fixtures and equipment (including automobiles, computer hardware and software) and leasehold improvements, and are recorded at cost, less accumulated depreciation and amortization. Depreciation of furniture, fixtures and equipment is computed using the straight-line method over the estimated useful lives of the respective assets (three to eight years). Amortization of improvements to leased properties is computed using the straight-line method based upon the initial term of the applicable lease or the estimated useful life of the improvements, whichever is shorter, and ranges from five to 10 years. Routine expenditures for repairs and maintenance are charged to expense when incurred. Major betterments and improvements are capitalized. Upon retirement or disposition of fixed assets, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recognized in the Consolidated Statements of Income. The Company evaluates fixed assets for impairment whenever events or changes in circumstances indicate that an asset's carrying value may not be fully recovered.
Deferred Financing Costs	Deferred Financing Costs
	Deferred financing costs consist of fees and expenses paid in connection with the closing of Fifth Street Holdings' credit facility and are capitalized at the time of payment. Deferred financing costs are amortized using the straight line method over the term of the credit facility and are included in interest expense Company's Consolidated Statements of Income.
Deferred Rent	Deferred Rent
	The Company recognizes rent expense on a straight-line basis over the expected lease term. Within the provisions of certain leases, there are free rent periods and escalations in payments over the base lease term. The effects of these items have been reflected in rent expense on a straight-line basis over the expected lease term. Landlord contributions and tenant allowances are included in the straight-line calculations and are being deferred over the lease term and are reflected as a reduction in rent expense.
Revenue Recognition	Revenue Recognition
	The Company has three principal sources of revenues: management fees, performance fees and other fees. These revenues are derived from the Company's agreements with the funds it manages, primarily the BDCs. The advisory agreements on which revenues are based are generally renewable on an annual basis by the general partner or the board of directors of the respective funds.
	Management Fees
	Management fees are generally based on a defined percentage of fair value of assets, total commitments, invested capital, net asset value, net investment income, total assets or par value of the investment portfolios managed by the Company. All management fees are earned from affiliated funds of the Company. The contractual terms of management fees vary by fund structure and investment strategy and range from 0.40% to 2.00% for base management fees, which are asset or capital-based.
	Management fees from affiliates also include quarterly incentive fees on the net investment income from the BDCs ("Part I Fees"). Part I Fees are generally equal to 20.0% of the BDCs' net investment income (before Part I Fees and performance fees payable based on capital gains), subject to fixed "hurdle rates" as defined in the respective investment advisory agreement. No fees are recognized until the BDCs' net investment income exceeds the respective hurdle rate, with a "catch-up" provision that serves to ensure the Company receives 20% of the BDCs' net investment income from the first dollar earned. Such fees are classified as management fees as they are paid quarterly, predictable and recurring in nature, not subject to repayment (or clawback) and cash settled each quarter. Management fees from affiliates are recognized as revenue in the period advisory services are rendered, subject to the Company's assessment of collectability.
	Performance Fees
	Performance fees are earned from the funds managed by the Company based on the performance of the respective funds. The contractual terms of performance fees vary by fund structure and investment strategy and are generally 15.0% to 20.0%.
	The Company has elected to adopt Method 2 of ASC 605-20, Revenue Recognition for Revenue Based on a Formula. Under this method, the Company records revenue when it is entitled to performance-based fees, subject to certain hurdles or benchmarks. The performance fees for any period are based upon an assumed liquidation of the fund's net assets on the reporting date, and distribution of the net proceeds in accordance with the fund's income allocation provisions. The performance fees may be subject to reversal to the extent that the performance fees recorded exceed the amount due to the general partner or investment manager based on a fund's cumulative investment returns.
	Performance fees related to the BDCs ("Part II Fees") are calculated and payable in arrears as of the end of each fiscal year of the BDCs and equal 20% of the BDCs' realized capital gains, if any, on a cumulative basis since inception, computed net of all realized capital losses and unrealized capital depreciation on a cumulative basis, less the aggregate amount of any previously paid capital gain incentive fees.
	Other Fees
	The Company also provides administrative services to the BDCs and private funds and the fees earned are reported within Revenues — Other fees. These fees generally represent the portion of compensation, overhead and other expenses incurred by the Company directly attributable to the funds, but may also be based on a fund's asset value. The Company selects the vendors, incurs the expenses, and is the primary obligor under the related arrangements. Such reimbursement is at cost with no profit to, or markup by, the Company. The Company is considered the principal under these arrangements and is required to record the expense and related reimbursement revenue on a gross basis. Other fees are recognized in the periods during which the related expenses are incurred and the reimbursements are contractually earned.
Compensation and Benefits	Compensation and Benefits
	Compensation generally includes salaries, bonuses and equity-based compensation charges. Bonuses are accrued over the service period to which they relate. All payments made to the Predecessor's managing member since inception and all payments made to the Predecessor's equity members since December 1, 2012 (see Note 11) related to their granted or purchased interests are accounted for as distributions on the equity held by such members.
	Equity-Based Compensation
	The Company accounts for stock-based compensation in accordance with ASC 718, “Compensation – Stock Compensation.” Under the fair value recognition provision of this guidance, share-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period.
	The Company recognizes expense related to equity-based compensation transactions in which it receives employee services in exchange for: (a) equity instruments of the Company or (b) liabilities that are based on the fair value of the Company's equity instruments. Equity-based compensation expense represents expenses associated with the: (i) granting of Part I Fee-sharing arrangements prior to the Reorganization; (ii) conversion of and acceleration in vesting of interests in the Predecessor in connection with the Reorganization, and (iii) the granting of restricted stock units, options to purchase Class A common shares and stock appreciation rights granted in connection with the IPO.
	Stock-based compensation expense recognized during the years ended December 31, 2014, 2013 and 2012 is based on awards ultimately expected to vest and has been reduced for estimated forfeitures. ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The effect of such change in estimated forfeitures is recognized through a cumulative catch-up adjustment that is included in the period of the change in estimate.
	The value of the portion of the award that is ultimately expected to vest on a straight-line basis over the requisite service period is included within compensation and benefits (except for grants to non-employees which are included in general, administrative and other expenses) in the Company’s Consolidated Statements of Income.
	The Company records deferred tax assets or liabilities for equity compensation plan awards based on deductions for income tax purposes of stock-based compensation recognized at the statutory tax rate in the jurisdiction in which the Company is expected to receive a tax deduction. In addition, differences between the deferred tax assets recognized for financial reporting purposes and the actual tax deduction reported on the Company's income tax returns are recorded as adjustments to additional paid-in capital. If the tax deduction is less than the deferred tax asset, the calculated shortfall reduces the pool of excess tax benefits. If the pool of excess tax benefits is reduced to zero, then subsequent shortfalls would increase the income tax expense.
Reimbursable Expenses	Reimbursable Expenses
	In the normal course of business, the Company pays certain expenses on behalf of the BDCs, primarily for professional travel and other costs associated with particular portfolio company holdings of the BDCs, for which it is reimbursed. Such expenses are not an obligation of the Company and are recorded as due from affiliates at the time of disbursement (see Note 10).
Fund Offering and Start-up Expenses	Fund Offering and Start-up Expenses
	In certain instances, the Company may bear offering costs related to capital raising activities of the BDCs, including underwriting commissions, which are expensed as incurred. In addition, the Company expenses all costs associated with starting new investment funds.
Income Taxes	Income Taxes
	Prior to the completion of the IPO, substantially all of the Company's earnings flowed through to the former members of FSM without being subject to entity level income taxes. Accordingly, no provision for income taxes has been recorded in the consolidated financial statements prior to the IPO.
	Fifth Street Holdings complies with the requirements of the Internal Revenue Code that are applicable to limited partnerships, which allow for the complete pass-through of taxable income or losses to Fifth Street Holdings limited partners, including FSAM, who are individually responsible for any federal tax consequences. Subsequent to the IPO, the tax provision includes the federal income tax obligation related to FSAM's allocated portion of Fifth Street Holdings' income. Fifth Street Holdings is subject to certain state and local taxes.
	The Company accounts for income taxes under the asset and liability method prescribed by ASC 740, "Income Taxes." As a result of the Company's acquisition of limited partnership interests in Fifth Street Holdings, the Company expects to benefit from amortization and other tax deductions reflecting the step-up in tax basis in the acquired assets. Those deductions will be used by the Company and will be taken into account in determining the Company's taxable income. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Management periodically assesses the recoverability of its deferred tax assets based upon expected future earnings, future deductibility of the asset and changes in applicable tax laws and other factors. If management determines that it is not probable that the deferred tax asset will be fully recoverable in the future, a valuation allowance may be established for the difference between the asset balance and the amount expected to be recoverable in the future. The allowance will result in a charge to the Company’s Consolidated Statements of Income. Further, the Company records its income taxes receivable and payable based upon its estimated income tax liability.
	The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs.
	The Company recognizes interest and penalties associated with tax matters such as franchise tax liabilities, if applicable, as general and administrative and other expenses.
Class A Earnings per Share	Class A Earnings per Share
	The Company computes basic earnings per share attributable to FSAM’s Class A common stockholders by dividing income attributable to FSAM by the weighted-average common shares outstanding for the period. Diluted earnings per share reflects the potential dilution beyond shares for basic earnings per share that could occur if securities or other contracts to issue common stock were exercised, converted into common stock, or resulted in the issuance of common stock that would have shared in the Company's earnings. Potentially dilutive securities include outstanding options to acquire Class A common shares, unvested restricted stock units and Fifth Street Holdings limited partnership interests which are exchangeable for Class A common shares. The dilutive effect of stock options and restricted stock units is reflected in diluted earnings per Class A common share by application of the treasury stock method.
	Under the treasury stock method, if the average market price of a Class A common share increases above the option's exercise price, the proceeds that would be assumed to be realized from the exercise of the option would be used to acquire outstanding Class A common shares. The dilutive effect of awards is directly correlated with the fair value of the Class A common shares. However, the awards may be anti-dilutive when the market price of the underlying shares exceeds the option's exercise price. This result is possible because the compensation expense attributed to future services but not yet recognized is included as a component of the assumed proceeds upon exercise.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In June 2013, the FASB issued ASU 2013-08, Financial Services — Investment Companies ("ASU 2013-08"). ASU 2013-08 provides clarifying guidance to determine if an entity qualifies as an investment company. ASU 2013-08 also requires an investment company to measure non-controlling interests in other investment companies at fair value. The following disclosures are required by ASU 2013-08: (i) whether an entity is an investment company and is applying the accounting and reporting guidance for investment companies; (ii) information about changes, if any, in an entity's status as an investment company; and (iii) information about financial support provided or contractually required to be provided by an investment company to any of its investees. The requirements of ASU 2013-08 were adopted by the Company beginning in the first quarter of 2014. There are no changes to the current requirements relating to the retention of specialized accounting in the financial statements of a non-investment company parent. These updates did not have a material impact on the Company's financial condition or results of operations.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The new standard will be effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of this standard on its consolidated financial statements and its ongoing financial reporting.
	In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the requisite service period, which clarifies the recognition of stock-based compensation over the required service period, if it is probable that the performance condition will be achieved. This guidance will be effective for fiscal years, and interim periods within those years, beginning after December 15, 2015 and should be applied prospectively. The Company is currently evaluating the effect that this guidance will have on its consolidated financial statements and its ongoing financial reporting.
	In August 2014, the FASB issued ASU No. 2014-13, Measuring the Financial Assets and Financial Liabilities of a Consolidated Collateralized Financing Entity ("CFE"). This new guidance requires reporting entities to use the more observable of the fair value of the financial assets or the financial liabilities to measure the financial assets and the financial liabilities of a CFE when a CFE is initially consolidated. It permits entities to make an accounting policy election to apply this same measurement approach after initial consolidation or to apply other GAAP to account for the consolidated CFE's financial assets and financial liabilities. It also prohibits all entities from electing to use the fair value option in ASC 825 to measure either the financial assets or financial liabilities of a consolidated CFE that is within the scope of this issue. This guidance is effective for fiscal years beginning after December 15, 2015, and interim periods therein. Early adoption is permitted using a modified retrospective transition approach as described in the pronouncement. The Company is currently evaluating the effect that this guidance will have on its consolidated financial statements and its ongoing financial reporting.
	In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern, which requires management to evaluate, at each annual and interim reporting period, the company's ability to continue as a going concern within one year of the date the financial statements are issued and provide related disclosures. This accounting guidance is effective for the Company on a prospective basis beginning in the first quarter of fiscal 2016 and is not expected to have a material effect on the consolidated financial statements.
	In February 2015, the FASB issued ASU 2015-02, which provides guidance on evaluating whether a reporting entity should consolidate certain legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are VIEs. Under this analysis, limited partnerships and other similar entities will be considered a VIE unless the limited partners hold substantive kick-out rights or participating rights. Further, the amendments eliminate the presumption that a general partner should consolidate a limited partnership under the voting interest model, as well as affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. ASU 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. A reporting entity may apply the amendments using a modified retrospective approach or a full retrospective application. The Company has elected to early adopt such guidance in these consolidated financial statements which resulted in deconsolidation of the Combined Funds. Although total assets and equity significantly decreased as a result of the Combined Funds' deconsolidation, it did not change net income or equity attributable to controlling interests in FSAM.

Significant_Accounting_Policie2

Significant Accounting Policies Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Variable Interest Entity Amounts in Consolidated Balance Sheet	As of December 31, 2014, the Company has recorded the following amounts in its Consolidated Statements of Financial Condition relating to Fifth Street Holdings:
	Assets
	Cash and cash equivalents	$	3,236,830
	Management fees receivable	26,861,787
	Performance fees receivable	106,635
	Prepaid expenses	1,150,013
	Investments in equity method investees	4,115,429
	Due from affiliates (1)	8,369,501
	Fixed assets, net	10,274,263
	Deferred tax assets	2,705,934
	Deferred financing costs	2,432,764
	Other assets	4,197,358
	Total assets	$	63,450,514
	Liabilities
	Accounts payable and accrued expenses	$	2,830,053
	Accrued compensation and benefits	11,095,548
	Loan payable	4,000,000
	Due to Principal	9,063,791
	Credit facility payable	12,000,000
	Due to affiliates (2)	747,505
	Deferred rent liability	3,261,434
	Total liabilities	42,998,331
	Equity	20,452,183
	Total liabilities and equity	$	63,450,514
	_____________
	(1) The amounts due from affiliates include $4,569,959 that is eliminated in consolidation.
	(2) The amounts due to affiliates include $684,724 that is eliminated in consolidation.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The following table presents the financial instruments carried at fair value as of December 31, 2013, by caption on the Company's Consolidated Statement of Financial Condition for each of the levels of hierarchy established by ASC 820:
	Liability	Level 1			Level 2			Level 3				Total
	Due to former member	$	—		$	—		$	2,093,437			$	2,093,437
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following tables provide a roll-forward of the changes in fair value of assets and liabilities for which the Company determines fair value using unobservable (Level 3) factors for the three months ended December 31, 2014:
		Due to Former Members
		31-Dec-14			31-Dec-13
	Fair value at beginning of period	$	2,093,437		$	3,079,431
	Current period additions	1,799,423			—
	Current period payments	(4,163,398		)	(896,937		)
	Fair value adjustments	270,538			(89,057		)
	Fair value at end of period	$	—		$	2,093,437
Fair Value Inputs, Liabilities, Quantitative Information	The following tables provide quantitative information related to the significant unobservable inputs for Level 3 liabilities, which were carried at fair value as of December 31, 2013:
	Liability	Fair Value			Valuation Technique		Unobservable Input	Range		Weighted Average
	Due to former member	$	2,093,437		Discounted cash		Discount rate	10%		10%
					flow approach
							Part I Fee estimated	$2,269,621 -		$	2,269,621
							future payments	$2,269,621
	Total	$	2,093,437
Financial Instruments Disclosed, But Not Carried at Fair Value	The following table presents the carrying value and fair value of the Company's financial assets and liabilities disclosed, but not carried, at fair value as of December 31, 2014 and the level of each financial asset and liability within the fair value hierarchy:
		Carrying			Fair Value			Level 1				Level 2		Level 3
		Value
	Investments in equity method investees	$	4,115,429		$	4,115,429		$	—			$	—	$	4,115,429
	Loan payable	4,000,000			4,049,110			—				—		4,049,110
	Credit facility payable	12,000,000			12,000,000			—				—		12,000,000
	Notes payable included in Due to Principal	5,564,451			5,564,451			—				—		5,564,451
	Payables to related parties pursuant to tax receivable agreements	47,373,245			42,352,014			—				—		42,352,014
	Total	$	73,053,125		$	68,081,004		$	—			$	—	$	68,081,004
	The following table presents the carrying value and fair value of the Company's financial liabilities disclosed, but not carried, at fair value as of December 31, 2013 and the level of each financial liability within the fair value hierarchy:
		Carrying			Fair Value			Level 1				Level 2		Level 3
		Value
	Loan payable	$	4,000,000		$	4,000,000		$	—			$	—	$	4,000,000

Fixed_Assets_Tables

Fixed Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of Fixed Assets	Fixed assets consist of the following:
		31-Dec-14			December 31, 2013
	Furniture, fixtures and equipment	$	3,563,172		$	1,568,550
	Leasehold improvements	7,864,805			111,779
	Construction in progress	—			698,568
	Fixed assets, cost	11,427,977			2,378,897
	Less: accumulated depreciation and amortization	(1,153,714		)	(942,216		)
	Fixed assets, net book value	$	10,274,263		$	1,436,681

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	Other assets consist of the following:
			31-Dec-14		31-Dec-13
	Security deposits		$	453,375	$	953,375
	Fractional interests in aircrafts (a)		3,585,283		1,540,900
	Other		158,700		158,700
			$	4,197,358	$	2,652,975
	__________________
	(a)	In November 2013, the Company entered into an agreement that entitled it to the use of a corporate aircraft for five years. The amount paid, less the estimated trade-in value, is being amortized on a straight-line basis over the expected five-year term of the agreement. In December 2014, the Company sold half of this interest for total consideration of $673,826 and recorded a gain on disposal of $14,410. In connection with the sale, the Company entered into an agreement for a second corporate aircraft for five years. Amortization expense for the years ended December 31, 2014 and 2013 was $233,701 and $29,098, respectively.

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt Maturing Over the Next Five Years	Outstanding principal amounts related to this loan maturing over the next five years are as follows:
	2015	$	—
	2016	—
	2017	51,551
	2018	627,050
	2019	642,908

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments for Operating Leases	Future minimum lease payments for operating leases with original or remaining non-cancelable lease terms in excess of one year as of December 31, 2014 are as follows:
	For the year ended December 31,
	2015	$	3,007,716
	2016	2,242,874
	2017	2,212,135
	2018	2,260,129
	2019	2,167,000
	Thereafter	10,890,000
		$	22,779,854

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Schedule of Amounts Due to and From Affiliates	As of December 31, 2014 and 2013 amounts due to and from affiliates were comprised of the following:
		31-Dec-14		31-Dec-13
	Management fees receivable:
	Base management fees receivable - BDCs	$	15,200,933	$	12,355,341
	Part I Fees receivable - BDCs	11,307,080		9,054,422
	Collateral management fees receivable - SLF I and SLF II	351,274		—
	Management fees receivable - FSOF	2,500		—
		$	26,861,787	$	21,409,763
	Performance fees receivable:
	Performance fees receivable - FSOF	$	106,635	$	—
		$	106,635	$	—
	Due from affiliates:
	Reimbursed expenses due from the BDCs	$	3,596,975	$	2,060,367
	Reimbursed expenses due from private funds	126,185		—
	Due from members for personal use of corporate aircraft	—		11,359
	Due from employees	59,489		14,672
	Due from landlord for construction costs	—		1,760,000
	Other amounts due from affiliated entities	16,893		2,093
		$	3,799,542	$	3,848,491
	Due to affiliates:
	Distribution payable to former members of Predecessor	$	59,316	$	—
	SARs liability	3,465		—
	Cash held on behalf of Fifth Street Mezzanine Partners II, L.P.	—		2,542,333
	Due to non-equity members for purchase of interests	—		129,001
		$	62,781	$	2,671,334

Equity_and_EquityBased_Compens1

Equity and Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Equity Classified Awards	The following table summarizes activity for the years ended December 31, 2014, 2013 and 2012 with respect to the Company's equity classified awards:
	Balance at December 31, 2011	$	—
	Fair value of granted and purchased interests	17,253,451
	Reclassification from liability-based awards	(2,065,664		)
	Amortization of granted and purchased interests	(130,504		)
	Balance at December 31, 2012	15,057,283
	Fair value of granted and purchased interests	5,925,572
	Cash received for purchased interests	(1,000,097		)
	Amortization of granted and purchased interests	(1,739,360		)
	Balance at December 31, 2013	18,243,398
	Fair value of purchased interest	4,035,926
	Cash received for purchased interest	(1,708,378		)
	Amortization of granted and purchased interests	(3,965,269		)
	Balance at November 4, 2014	16,605,677
	Impact of conversion and change in vesting of member interests in Predecessor	(8,391,490		)
	Amortization of Holdings LP Interests	(171,129		)
	Balance at December 31, 2014	$	8,043,058
Schedule of Liability Classified Awards	The following table summarizes activity for the year ended December 31, 2014, 2013 and 2012 with respect to the Company's liability classified awards:
	Balance at December 31, 2011	$	1,382,720
	Cash received for purchased interests	682,944
	Compensation expense	2,729,961
	Payment of liabilities	(2,729,961		)
	Reclassification to equity-based awards	(2,065,664		)
	Balance at December 31, 2012	—
	Cash received for purchased interests	129,001
	Compensation expense	123,019
	Payment of liabilities	(123,019		)
	Balance at December 31, 2013	129,001
	Cash received for purchased interests	14,129
	Compensation expense	228,140
	Payment of liabilities	(228,140		)
	Impact of conversion of member interests in Predecessor	(143,130		)
	Issuance of stock appreciation rights - see below	3,465
	Balance at December 31, 2014	$	3,465
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	Equity-based compensation expense, net of assumed forfeitures is included in the following table:
			Year Ended December 31, 2014
	Restricted stock units to be settled in Class A common stock		$	429,626
	Options to acquire shares of Class A common stock		383,589
	Stock appreciation rights to be settled in cash		3,465
	Total		$	816,680
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table presents unvested restricted stock units' activity during the period from November 4, 2014 through December 31, 2014:
			Restricted Units			Weighted Average Grant Date Fair
						Value Per Unit
	Balance - November 4, 2014		—			$	—
	Granted - IPO		1,174,748			17
	Granted - Post-IPO		—			—
	Vested		—			—
	Forfeited		—			—
	Balance - December 31, 2014		1,174,748			$	17
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The following table provides summary information and significant assumptions for each tranche of options granted:
			Class of Option Grants
			Employees				Officers				Non-employee Directors
	Number of options granted		3,894,968				1,714,002				50,000
	Strike price		$	18.7			$	18.7			$	18.7
	Contractual term		10 years				5 years				5 years
	Expected dividend yield		7.06		%		7.06		%		7.06		%
	Expected volatility		29.5		%		29.5		%		29.5		%
	Risk-free rate		2.3		%		1.53		%		1.53		%
	Grant date fair value		$	1.78			$	1.67			$	1.62
Schedule of Share-based Compensation, Stock Options, Activity	A summary of unvested options activity during the period from November 4, 2014 through December 31, 2014 is presented below:
			Options			Weighted Average Exercise Price				Weighted Average Remaining Life (in years)			Aggregate Intrinsic Value
	Balance - November 4, 2014		—			$	—			—
	Granted - IPO		5,658,970			18.7				8.28
	Vested		—			—				—
	Forfeited or expired		—			—				—
	Balance - December 31, 2014		5,658,970			$	18.7			8.28
	Exercisable at December 31, 2014		—			$	—			—			$	—
	Expected to vest after December 31, 2014		4,654,091			$	18.7			8.28			$	—
Schedule of Other Share-based Compensation, Activity	A summary of unvested SARs activity during the period from November 4, 2014 through December 31, 2014 is presented below:
			SARs			Weighted Average Grant Date Fair Value Per Unit
	Balance November 4, 2014		—			$	—
	Granted - IPO		90,500			1.78
	Vested		—			—
	Forfeited		—			—
	Balance December 31, 2014		90,500			$	1.78

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Components of the provision (benefit) for income taxes consist of the following:
		Year Ended December 31,
			2014			2013		2012
	Current provision:
	Federal		$	291,530		$	—	$	—
	State and local		69,522			—		—
	Total current expense		361,052			—		—
	Deferred benefit:
	Federal		(1,992,191		)	—		—
	State and local		(246,619		)	—		—
	Total deferred benefit		(2,238,810		)	—		—
	Income tax benefit		$	(1,877,758	)	$	—	$	—
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the U.S. statutory income tax rate of 34% to the Company's effective tax rate is as follows:
		Year Ended December 31,
			2014			2013		2012
	Provision at Federal statutory tax rate		$	12,557,925		$	—	$	—
	State and local taxes, net of federal benefit		(116,882		)	—		—
	Change in tax status		(1,089,600		)	—		—
	Income attributable to Predecessor not subject to tax		(13,240,665		)	—		—
	Effect of permanent differences		11,464			—		—
	Income tax benefit		$	(1,877,758	)	$	—	$	—
Schedule of Deferred Tax Assets and Liabilities	These temporary differences result in taxable or deductible amounts in future years. Details of the Company's deferred tax assets and liabilities are summarized as follows:
			As of December 31,
			2014			2013
	Deferred tax assets:
	Net operating loss carryforwards		$	3,443,350		$	—
	Reserves and accruals		1,649,929			—
	Share-based compensation		340,339			—
	Step-up related to purchase of 12% interest in Fifth Street Holdings		55,312,497			—
	Other		3,320			—
	Total deferred tax assets		60,749,435			—
	Deferred tax liabilities:
	Property and equipment and other long-lived assets		(2,269,026		)	—
	Other		(508,370		)	—
	Total deferred liabilities		(2,777,396		)	—
	Total net deferred tax assets		$	57,972,039		$	—

Earnings_per_Share_Tables

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings per Share	The following is a reconciliation of the numerator and denominator used in the basic and diluted EPS calculations (in thousands, except shares and per share information):
		Period from November 4, 2014 through December 31, 2014
	Numerator:
	Net income attributable to Fifth Street Asset Management Inc.	$	528,577
	Denominator for basic and diluted net income per share of Class A common stock:
	Weighted average shares of Class A common stock outstanding	6,000,033
	Earnings per share of Class A common stock:
	Net income attributable to Fifth Street Asset Management Inc. per share of Class A common stock, basic and diluted	$	0.09
	Shares of Class B common stock have no impact on the calculation of net income per share of Class A common stock as holders of Class B common stock do not participate in net income or dividends, and thus, are not participating securities.

Quarterly_Financial_Informatio1

Quarterly Financial Information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (unaudited)	Summarized unaudited quarterly results for the years ended December 31, 2014 and 2013 are presented below. For periods prior to the Reorganization and IPO, the financial information reflects the consolidated financial results of the Predecessor and the deconsolidation of the previously Combined Funds as discussed in Note 1:
		For the quarter ended March 31, 2014			Deconsolidation of Combined Funds and Effects of Reorganization			For the quarter ended March 31, 2014 -			For the quarter ended June 30, 2014			Deconsolidation of Combined Funds and Effects of Reorganization			For the quarter ended June 30, 2014 -
								As Adjusted									As Adjusted
	Revenues	$	23,753,029		$	14,336		$	23,767,365		$	23,317,866		$	87,217		$	23,405,083
	Net income	$	14,859,754		$	(371,240	)	$	14,488,514		$	10,968,678		$	(1,908,219	)	$	9,060,459
	Net income attributable to	$	(391,416	)	$	391,416		$	—		$	(872,905	)	$	872,905		$	—
	redeemable non-controlling
	interests in Combined Funds
	Net (income) loss attributable to non-controlling interests in	$	20,176		$	(20,176	)	$	—		$	(1,035,314	)	$	1,035,314		$	—
	Combined Funds
	Net income attributable to	$	—		$	(14,488,514	)	$	(14,488,514	)	$	—		$	(9,060,459	)	$	(9,060,459	)
	Predecessor
	Net income attributable to non-	$	—		$	—		$	—		$	—		$	—		$	—
	controlling interests in Fifth
	Street Holdings L.P.
	Net income attributable to	$	14,488,514		$	(14,488,514	)	$	—		$	9,060,459		$	(9,060,459	)	$	—
	controlling interests in Fifth
	Street Management Group
	Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
	Fifth Street Asset
	Management Inc.
		For the quarter ended September 30, 2014			Deconsolidation of Combined Funds and Effects of Reorganization			For the quarter ended September 30, 2014 -			For the quarter ended December 31, 2014
								As Adjusted
	Revenues	$	25,418,658		$	271,931		$	25,690,589		$	30,343,024
	Net income	$	17,536,869		$	(2,981,758	)	$	14,555,111		$	708,748
	Net income attributable to redeemable non-controlling interests in	$	(1,072,218	)	$	1,072,218		$	—		$	—
	Combined Funds
	Net income attributable to non-controlling interests in Combined	$	(1,909,540	)	$	1,909,540		$	—		$	—
	Funds
	Net income attributable to Predecessor	$	—		$	(14,555,111	)	$	(14,555,111	)	$	11,375,127
	Net (income) loss attributable to non-controlling interests in Fifth	$	—		$	—		$	—		$	(11,555,298	)
	Street Holdings L.P.
	Net income attributable to	$	14,555,111		$	(14,555,111	)	$	—		$	—
	controlling interests in Fifth
	Street Management Group
	Net income attributable to Fifth Street Asset Management Inc.	$	—		$	—		$	—		$	528,577
	Net income per share attributable to Fifth Street Management Inc.										$	0.09
	Class A common stock - Basic and Diluted
	Weighted average shares of Class A common stock outstanding -										6,000,033
	Basic and Diluted
		For the quarter ended March 31, 2013			Effects of Reorganization			For the quarter ended March 31, 2013 -			For the quarter ended June 30, 2013			Effects of Reorganization			For the quarter ended June 30, 2013 -
								As Adjusted									As Adjusted
	Revenues	$	15,752,732		$	—		$	15,752,732		$	16,840,884		$	—		$	16,840,884
	Net income	$	10,250,983		$	—		$	10,250,983		$	10,109,004		$	—		$	10,109,004
	Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
	redeemable non-controlling
	interests in Combined Funds
	Net (income) loss attributable to non-controlling interests in	$	—		$	—		$	—		$	—		$	—		$	—
	Combined Funds
	Net income attributable to	$	—		$	(10,250,983	)	$	(10,250,983	)	$	—		$	(10,109,004	)	$	(10,109,004	)
	Predecessor
	Net income attributable to non-	$	—		$	—		$	—		$	—		$	—		$	—
	controlling interests in Fifth
	Street Holdings L.P.
	Net income attributable to	$	10,250,983		$	(10,250,983	)	$	—		$	10,109,004		$	(10,109,004	)	$	—
	controlling interests in Fifth
	Street Management Group
	Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
	Fifth Street Asset
	Management Inc.
		For the quarter ended September 30, 2013			Effects of Reorganization			For the quarter ended September 30, 2013 -			For the quarter ended December 31, 2013			Effects of Reorganization			For the quarter ended December 31, 2013 -
								As Adjusted									As Adjusted
	Revenues	$	17,645,150		$	—		$	17,645,150		$	23,383,272		$	—		$	23,383,272
	Net income	$	4,421,182		$	—		$	4,421,182		$	14,990,653		$	—		$	14,990,653
Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
redeemable non-controlling
interests in Combined Funds
Net (income) loss attributable to non-controlling interests in	$	—		$	—		$	—		$	—		$	—		$	—
Combined Funds
Net income attributable to	$	—		$	(4,421,182	)	$	(4,421,182	)	$	—		$	(14,990,653	)	$	(14,990,653	)
Predecessor
Net income attributable to non-	$	—		$	—		$	—		$	—		$	—		$	—
controlling interests in Fifth
Street Holdings L.P.
Net income attributable to	$	4,421,182		$	(4,421,182	)	$	—		$	14,990,653		$	(14,990,653	)	$	—
controlling interests in Fifth
Street Management Group
Net income attributable to	$	—		$	—		$	—		$	—		$	—		$	—
Fifth Street Asset
Management Inc.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Details) (USD $)	0 Months Ended		12 Months Ended			0 Months Ended	2 Months Ended	10 Months Ended
	Nov. 04, 2014	Oct. 13, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 03, 2014	Dec. 31, 2014	Nov. 04, 2014
			segment
Related Party Transaction [Line Items]
Number of reportable segments			1
Exchange agreement, period before transfers are permitted	2 years
Proceeds from sale of Class A common shares in Initial Public Offering			$95,880,000	$0	$0
Offering expenses of Initial Public Offering			3,741,134	0	0
Cash savings payable to TRA Recipients under tax receivable agreement, percent	85.00%
Stock split ratio		0.3333
Fifth Street Holdings L.P. [Member]
Related Party Transaction [Line Items]
Noncontrolling interest, interest held by noncontrolling owners			88.00%				88.00%
Common Class A [Member]
Related Party Transaction [Line Items]
Exchange agreement, conversion ratio	1
Shares issued in the IPO (shares)	6,000,000
IPO share price (in dollars per share)	17							17
Proceeds from sale of Class A common shares in Initial Public Offering	95,900,000
Underwriting commissions	6,100,000
Offering expenses of Initial Public Offering	3,900,000
Common shares outstanding (shares)			6,000,033				6,000,033
Common Class B [Member]
Related Party Transaction [Line Items]
Common shares outstanding (shares)			42,856,854				42,856,854
Principals of Fifth Street Holdings, L.P. [Member]
Related Party Transaction [Line Items]
Ownership interest exchanged, percent						100.00%
Principals of Fifth Street Holdings, L.P. [Member] | Common Class B [Member]
Related Party Transaction [Line Items]
Common shares outstanding (shares)	42,856,854							42,856,854
Members of Fifth Street Management LLC [Member]
Related Party Transaction [Line Items]
Ownership interest exchanged, percent						100.00%
Members of FSCO GP LLC [Member]
Related Party Transaction [Line Items]
Ownership interest exchanged, percent						100.00%
Fifth Street Holdings L.P. [Member]
Related Party Transaction [Line Items]
Ownership interest in Fifth Street Holdings L.P., percent	12.00%
Holdings LP Interests [Member]
Related Party Transaction [Line Items]
Holdings LP Interests (shares)	6,000,000							6,000,000
Holdings LP Interests [Member] | Principals of Fifth Street Holdings, L.P. [Member]
Related Party Transaction [Line Items]
Holdings LP Interests (shares)	42,856,854							42,856,854
Holdings LP Interests [Member] | Limited Partners of Fifth Street Holdings, L.P. [Member]
Related Party Transaction [Line Items]
Holdings LP Interests (shares)	44,000,000							44,000,000
Common Stock [Member] | Common Class A [Member]
Related Party Transaction [Line Items]
Shares issued in the IPO (shares)							6,000,000	33
Common Stock [Member] | Common Class B [Member]
Related Party Transaction [Line Items]
Shares issued in the IPO (shares)							42,856,854
Common Stock [Member] | Principals of Fifth Street Holdings, L.P. [Member]
Related Party Transaction [Line Items]
Voting power of FSAM's common stock, percent	97.30%
Reclassification Between Financing and Non Financing Activities [Member]
Related Party Transaction [Line Items]
Noncash Capital Contributions and Distributions				$5,700,000

Significant_Accounting_Policie3

Significant Accounting Policies - Variable Interest Entities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	3,238,008	$4,015,728	$4,015,728	$16,156,777	$3,628,684
Prepaid expenses	1,150,013	142,033
Investments in equity method investees	4,115,429	0
Due from affiliates	3,799,542	3,848,491
Fixed assets, net	10,274,263	1,436,681
Deferred tax assets	57,972,039	0
Deferred financing costs	2,432,764	0
Other assets	4,197,358	2,652,975
Total assets	114,147,838	33,505,671
Liabilities
Accounts payable and accrued expenses	3,045,651	1,198,205
Accrued compensation and benefits	11,095,548	538,035
Loan payable	4,000,000	4,000,000
Credit facility payable	12,000,000	0
Due to affiliates	62,781	2,671,334
Deferred rent liability	3,261,434	1,980,146
Total liabilities	90,263,503	12,481,157
Equity	6,752,637	0
Total liabilities and equity	114,147,838	33,505,671
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Percent of voting power held	97.30%
Variable Interest Entity, Not Primary Beneficiary [Member]
Liabilities
Maximum exposure to loss	4,115,429
Variable Interest Entity, Primary Beneficiary [Member]
Assets
Cash and cash equivalents	3,236,830
Prepaid expenses	1,150,013
Investments in equity method investees	4,115,429
Due from affiliates	8,369,501
Fixed assets, net	10,274,263
Deferred tax assets	2,705,934
Deferred financing costs	2,432,764
Other assets	4,197,358
Total assets	63,450,514
Liabilities
Accounts payable and accrued expenses	2,830,053
Accrued compensation and benefits	11,095,548
Loan payable	4,000,000
Due to Principal Affiliates	9,063,791
Credit facility payable	12,000,000
Due to affiliates	747,505
Deferred rent liability	3,261,434
Total liabilities	42,998,331
Equity	20,452,183
Total liabilities and equity	63,450,514
Consolidation, Eliminations [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets
Due from affiliates	4,569,959
Liabilities
Due to affiliates	684,724
Management Fees Receivable [Member]
Assets
Management fees receivable	26,861,787	21,409,763
Performance Fees Receivable [Member]
Assets
Management fees receivable	106,635	$0

Significant_Accounting_Policie4

Significant Accounting Policies - Additional Disclosures (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Accounting Policies [Line Items]
Advisory and administrative services revenue as a percent of total revenue	100.00%	100.00%	100.00%
Impairment of Long-Lived Assets Held-for-use	$0	$0	$0
Part I fees percentage	20.00%
Catch-up provision, Percentage of BDC revenue	20.00%
BDCC performance fee percentage	20.00%
Fifth Street Finance Corp. [Member] | Follow-on Equity Offering [Member]
Schedule of Accounting Policies [Line Items]
Expenses associated with offerings	822,000
Fifth Street Floating Rate Corp. [Member] | IPO [Member]
Schedule of Accounting Policies [Line Items]
Expenses associated with offerings		5,700,000
Minimum [Member]
Schedule of Accounting Policies [Line Items]
Management fee percentage charged to funds	0.40%
Fund performance fee percentage	15.00%
Maximum [Member]
Schedule of Accounting Policies [Line Items]
Management fee percentage charged to funds	2.00%
Fund performance fee percentage	20.00%
Leasehold Improvements [Member] | Minimum [Member]
Schedule of Accounting Policies [Line Items]
Useful life	5 years
Leasehold Improvements [Member] | Maximum [Member]
Schedule of Accounting Policies [Line Items]
Useful life	10 years
Chief Executive Officer [Member]
Schedule of Accounting Policies [Line Items]
Percent of voting interest held	91.20%
Equity Method Investments [Member]
Schedule of Accounting Policies [Line Items]
Asset Impairment Charges	$0	$0	$0

Fair_Value_Measurements_Financ

Fair Value Measurements - Financial Instruments Carried at Fair Value (Details) (USD $)	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due to former member	$2,093,437
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due to former member	0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due to former member	0
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due to former member	$2,093,437

Fair_Value_Measurements_Rollfo

Fair Value Measurements - Rollforward of Fair Value, Liabilities (Details) (Level 3 [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	$2,093,437	$3,079,431	$2,093,437
Current period additions	1,799,423	0
Current period payments	-4,163,398	-896,937
Fair value adjustments	270,538	-89,057
Fair value at end of period	$0	$2,093,437	$2,093,437

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value, Liabilities, Quantitative Information (Details) (Level 3 [Member], USD $)	12 Months Ended
	Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liabilities at fair value	$2,093,437
Due to Former Member [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liabilities at fair value	2,093,437
Due to Former Member [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Part I Fee, Estimated Future Payments	2,269,621
Due to Former Member [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount Rate	10.00%
Part I Fee, Estimated Future Payments	2,269,621
Due to Former Member [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount Rate	10.00%
Part I Fee, Estimated Future Payments	$2,269,621

Fair_Value_Measurements_Financ1

Fair Value Measurements - Financial Instruments Disclosed but not Carried at Fair Value (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity method investees	$4,115,429
Loan payable	4,000,000	4,000,000
Credit facility payable	12,000,000
Notes payable included in Due to Principal	5,564,451
Payables to related parties pursuant to tax receivable agreements	47,373,245
Total	73,053,125
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity method investees	4,115,429
Loan payable	4,049,110	4,000,000
Credit facility payable	12,000,000
Notes payable included in Due to Principal	5,564,451
Payables to related parties pursuant to tax receivable agreements	42,352,014
Total	68,081,004
Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity method investees	0
Loan payable	0	0
Credit facility payable	0
Notes payable included in Due to Principal	0
Payables to related parties pursuant to tax receivable agreements	0
Total	0
Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity method investees	0
Loan payable	0	0
Credit facility payable	0
Notes payable included in Due to Principal	0
Payables to related parties pursuant to tax receivable agreements	0
Total	0
Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity method investees	4,115,429
Loan payable	4,049,110	4,000,000
Credit facility payable	12,000,000
Notes payable included in Due to Principal	5,564,451
Payables to related parties pursuant to tax receivable agreements	42,352,014
Total	$68,081,004

Due_from_Affiliates_Details

Due from Affiliates - (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Due from affiliates	$3,799,542	$3,848,491
Landlord [Member]
Related Party Transaction [Line Items]
Due from affiliates		$1,760,000

Fixed_Assets_Details

Fixed Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Fixed assets	$11,427,977	$2,378,897
Less: accumulated depreciation and amortization	-1,153,714	-942,216
Fixed assets, net book value	10,274,263	1,436,681
Depreciation and amortization	752,144	207,794	202,834
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Fixed assets	3,563,172	1,568,550
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets	7,864,805	111,779
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Fixed assets	0	698,568
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Improvements to corporate headquarters		7,700,000
Fixed Assets [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	752,144	207,794	202,834
Landlord [Member] | Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Improvements to corporate headquarters		$1,760,000

Other_Assets_Details

Other Assets (Details) (USD $)	1 Months Ended			12 Months Ended
	Dec. 31, 2014		Nov. 30, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Other Assets [Line Items]
Security deposits	$453,375			$453,375		$953,375
Fractional interest in aircraft	3,585,283	[1]		3,585,283	[1]	1,540,900	[1]
Other	158,700			158,700		158,700
Other Assets	4,197,358			4,197,358		2,652,975
Corporate Aircraft Agreement, Term	5 years		5 years
Sale of fractional interest in aircraft, percent of interest sold	50.00%
Sale of fractional interest in aircraft, total consideration				673,826		0		0
Amortization of fractional interests in aircrafts				233,701		29,098		0
Fractional Interest in Aircraft [Member]
Other Assets [Line Items]
Sale of fractional interest in aircraft, total consideration	673,826
Gain on disposal of fractional interest in aircraft	$14,410
[1]	In November 2013, the Company entered into an agreement that entitled it to the use of a corporate aircraft for five years. The amount paid, less the estimated trade-in value, is being amortized on a straight-line basis over the expected five-year term of the agreement. In December 2014, the Company sold half of this interest for total consideration of $673,826 and recorded a gain on disposal of $14,410. In connection with the sale, the Company entered into an agreement for a second corporate aircraft for five years. Amortization expense for the years ended DecemberB 31, 2014 and 2013 was $233,701 and $29,098, respectively.

Due_to_Former_Members_Details

Due to Former Members (Details) (USD $)	10 Months Ended	12 Months Ended		0 Months Ended			12 Months Ended
	Nov. 04, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 04, 2014	17-May-14	Nov. 05, 2010	Dec. 31, 2014	Jul. 03, 2014
Related Party Transaction [Line Items]
Distribution with a corresponding offset to members' equity	$73,686,241	$41,110,872	$29,924,755
Former Member [Member]
Related Party Transaction [Line Items]
Repurchase of member's pro rata share of Part I fees, term of agreement						5 years
Maximum allocation by the managing member to the former member of proceeds from the sale						6,000,000
Due to former member		2,093,437					0
Compensation expense to former member upon vesting of equity-based awards				144,000
Distribution with a corresponding offset to members' equity				5,856,000
Repurchase amount of member's pro rata share of Part I fees included in separation agreement					1,713,802
Compensation expense recognized in connection with the agreement to repurchase the former member's interest					2,599,803
Compensation expense recognized in connection with the reallocation to the managing member of the former member's forfeited interest					2,327,548
Fair value of the repurchase of former member's pro rata share of Part I fees and reallocation of former member's forfeited interest to managing member, net								4,035,926
Former Member [Member] | Compensation Expense [Member]
Related Party Transaction [Line Items]
Fair value adjustment to the liability for compensation expense		($89,057)	($311,723)				$270,358

Debt_Debt_Maturities_Details

Debt - Debt Maturities (Details) (Connecticut Department of Economic and Community Development [Member], Loans Payable [Member], Fixed Rate Secured Loan [Member], USD $)	Dec. 31, 2014
Connecticut Department of Economic and Community Development [Member] | Loans Payable [Member] | Fixed Rate Secured Loan [Member]
Debt Instrument [Line Items]
2015	$0
2016	0
2017	51,551
2018	627,050
2019	$642,908

Debt_Loans_Payable_Details

Debt - Loans Payable (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 07, 2013
Debt Instrument [Line Items]
Interest expense	$323,363	$11,233	$293
Loans Payable [Member] | Fixed Rate Secured Loan [Member] | Connecticut Department of Economic and Community Development [Member]
Debt Instrument [Line Items]
Long-term debt				4,000,000
Stated interest rate, percentage				2.50%
Maximum amount of conditional forgiveness of debt	3,000,000
Penalty, per job, for missed milestones	78,125
Job training program grant	500,000
Alternative energy system installation grant	500,000
Interest and Other Income (Expense) [Member] | Loans Payable [Member] | Fixed Rate Secured Loan [Member] | Connecticut Department of Economic and Community Development [Member]
Debt Instrument [Line Items]
Interest expense	$100,000	$11,233

Debt_Credit_Facility_Details

Debt - Credit Facility (Details) (USD $)	0 Months Ended
	Nov. 04, 2014	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Credit facility payable		$12,000,000	$0
Fifth Street Holdings L.P. [Member] | Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility Maturing in 2019 [Member]
Debt Instrument [Line Items]
Revolving credit facility borrowing capacity	176,000,000
Borrowing capacity accordion feature	100,000,000
Unused commitment fee, percent	0.30%
Revolving credit agreement, term	5 years
Credit facility payable		12,000,000
Fair value of amount outstanding		$12,000,000
Fifth Street Holdings L.P. [Member] | Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility Maturing in 2019 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on LIBOR, percent	2.00%

Commitments_and_Contingencies_1

Commitments and Contingencies - Narrative (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2014	Aug. 31, 2014	Aug. 01, 2013
Loss Contingencies [Line Items]
Rent expense	$3,963,909	$1,093,947	$956,615
Employment eligibility period	3 months
Matching contribution requisite service period	2 years
Matching contribution vesting period	6 years
Defined Contribution Plan, Cost Recognized	589,660	268,854	166,553
Terminated Lease Agreement for White Plains, NY Office [Member]
Loss Contingencies [Line Items]
Early termination fee				616,852
Additional rent expense representing fair value of remaining lease obligation				460,658
Sublease Agreement for Greenwich, CT Office [Member]
Loss Contingencies [Line Items]
Additional rent expense representing fair value of remaining lease obligation					196,926
Managing Member [Member] | Commercial Mortgage [Member]
Loss Contingencies [Line Items]
Guarantor obligation						26,000,000
SLF I [Member]
Loss Contingencies [Line Items]
Unfunded commitments	$0

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments (Details) (USD $)	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2015	$3,007,716
2016	2,242,874
2017	2,212,135
2018	2,260,129
2019	2,167,000
Thereafter	10,890,000
Total	$22,779,854

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 22, 2013	Oct. 11, 2014	Oct. 29, 2014
				renewal_term
Performance Fees [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$106,635	$0	$0
Due From Affiliates [Member] | Reimbursable Expenses [Member]
Related Party Transaction [Line Items]
Accounts receivable, related parties	3,723,160	2,060,367
Principal Owner [Member]
Related Party Transaction [Line Items]
Accrued undistributed earnings	3,499,341
Due to related party	9,063,792	0
Principal Owner [Member] | Notes Payable, Other Payables [Member]
Related Party Transaction [Line Items]
Notes payable						5,564,451
Interest rate (as a percent)	1.00%
Recipients of Tax Receivable Agreements [Member]
Related Party Transaction [Line Items]
Due to related party	47,373,245	0
Tax Receivable Agreement Liability, Payable in the Next Twelve Months	343,621
Tax Receivable Agreement Liability, Due Date	45 days
Business Development Companies [Member] | Management Fees [Member]
Related Party Transaction [Line Items]
Revenue from related parties	94,838,783	68,308,323	49,520,198
Accounts receivable, related parties	26,508,013	21,409,763
Related party transactions, asset management fees waived	952,945	2,321,986	0
Business Development Companies [Member] | Revenues - Other Fees [Member] | Administration Agreement Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, other fees	7,674,019	5,204,820	4,636,865
Entity Controlled by Managing Member [Member]
Related Party Transaction [Line Items]
Number of lease renewal periods				2
Lease renewal term (years)				5 years
Entity Controlled by Managing Member [Member] | Lease Agreements [Member]
Related Party Transaction [Line Items]
Rental payments, per year					$2,000,000

Related_Party_Transactions_Amo

Related Party Transactions - Amounts Due and From Affiliates (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Due from affiliates	$3,799,542	$3,848,491
Due to affiliates	62,781	2,671,334
Reimbursed Expenses Due From Business Development Companies [Member]
Related Party Transaction [Line Items]
Due from affiliates	3,596,975	2,060,367
Reimbursed Expenses Due from Private Funds [Member]
Related Party Transaction [Line Items]
Due from affiliates	126,185	0
Due From Members For Personal Use of Aircraft [Member]
Related Party Transaction [Line Items]
Due from affiliates	0	11,359
Due From Employees [Member]
Related Party Transaction [Line Items]
Due from affiliates	59,489	14,672
Due From Landlord For Construction Costs [Member]
Related Party Transaction [Line Items]
Due from affiliates	0	1,760,000
Other Amounts Due From Affiliated Entities [Member]
Related Party Transaction [Line Items]
Due from affiliates	16,893	2,093
Distribution Payable to Former Members of Predecessor [Member]
Related Party Transaction [Line Items]
Due to affiliates	59,316	0
SARs Liability [Member]
Related Party Transaction [Line Items]
Due to affiliates	3,465	0
Cash Held on Behalf of Fund II [Member]
Related Party Transaction [Line Items]
Due to affiliates	0	2,542,333
Due to Non-equity Members For Purchase of Interests [Member]
Related Party Transaction [Line Items]
Due to affiliates	0	129,001
Management Fees [Member]
Related Party Transaction [Line Items]
Management fees receivable	26,861,787	21,409,763
Performance Fees [Member]
Related Party Transaction [Line Items]
Management fees receivable	106,635	0
Business Development Companies [Member] | Base Management Fees Receivable [Member]
Related Party Transaction [Line Items]
Management fees receivable	15,200,933	12,355,341
Business Development Companies [Member] | Part I Fees Receivable [Member]
Related Party Transaction [Line Items]
Management fees receivable	11,307,080	9,054,422
SLF I and SLF II [Member] | Collateral Management Fees [Member]
Related Party Transaction [Line Items]
Management fees receivable	351,274	0
FSOF [Member] | Management Fees [Member]
Related Party Transaction [Line Items]
Management fees receivable	2,500	0
FSOF [Member] | Performance Fees [Member]
Related Party Transaction [Line Items]
Management fees receivable	$106,635	$0

Equity_and_EquityBased_Compens2

Equity and Equity-Based Compensation (Details) (USD $)

2 Months Ended

12 Months Ended

0 Months Ended

11 Months Ended

15 Months Ended

0 Months Ended

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jan. 01, 2014

Jan. 01, 2013

Mar. 01, 2012

Jan. 03, 2012

Jul. 17, 2013

Nov. 30, 2012

Sep. 30, 2014

Dec. 31, 2013

Jan. 15, 2015

Nov. 04, 2014

Dec. 31, 2011

Apr. 01, 2013

class

equity_member

Member's Equity [Line Items]

Number of classes of common stock

2

Payments to members

$2,811,576

Retirement eligibility liability reclassified to member's equity

2,065,664

Fair value of equity classified awards

8,043,058

8,043,058

18,243,398

15,057,283

15,187,787

18,243,398

16,605,677

0

Amortization of granted and purchased interests

3,965,269

1,739,360

130,504

Unrecognized compensation costs

8,043,058

8,043,058

Period for recognition of unrecognized compensation costs

7 years 9 months 28 days

Number of employees

3

Non-Equity Member [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Sale of all or a portion of Part I fee

14,129

82,141

374,034

308,910

Equity Members [Member] | Members' Equity [Member]

Member's Equity [Line Items]

Sale of all or a portion of Part I fee

505,597

Non-equity Members and Employees [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Sale of all or a portion of Part I fee

46,860

January 1, 2012 [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Distributions included in compensation expense, Part I fees

144,808

January 1, 2013 [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Distributions included in compensation expense, Part I fees

68,721

52,569

March 1, 2012 [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Distributions included in compensation expense, Part I fees

54,285

July 17, 2013 [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Distributions included in compensation expense, Part I fees

48,779

154,813

Number of non-equity members

2

Number of employees

2

January 1, 2014 [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Distributions included in compensation expense, Part I fees

8,391

April 1, 2013 [Member] | Non-Equity Member [Member] | Due to Affiliates [Member]

Member's Equity [Line Items]

Distributions included in compensation expense, Part I fees

103,423

59,959

Equity Classified Awards [Member] | July 17, 2013 [Member]

Member's Equity [Line Items]

Fair value of equity classified awards

3,639,150

Compensation expense, Part I fees

323,107

161,401

Number of equity members

7

Subsequent forfeitures

325,587

Equity Classified Awards [Member] | April 1, 2013 [Member]

Member's Equity [Line Items]

Fair value of equity classified awards

184,213

Compensation expense, Part I fees

9,931

11,917

Number of equity members

2

Managing Member [Member] | Equity Members [Member] | Members' Equity [Member]

Member's Equity [Line Items]

Sale of all or a portion of Part I fee

350,000

Managing Member [Member] | Equity Classified Awards [Member] | December 31, 2013 [Member]

Member's Equity [Line Items]

Fair value of equity classified awards

40,726

40,726

Period to retirement eligibility

12 years

Managing Member and Another Member [Member] | Equity Members [Member] | Members' Equity [Member]

Member's Equity [Line Items]

Sale of all or a portion of Part I fee

56,800

Managing Member and Another Member [Member] | Equity Classified Awards [Member] | December 31, 2013 [Member]

Member's Equity [Line Items]

Fair value of equity classified awards

735,800

735,800

Compensation expense, Part I fees

$55,403

Period to retirement eligibility

12 years

Common Class A [Member]

Member's Equity [Line Items]

Number of votes

1

Common Class B [Member]

Member's Equity [Line Items]

Number of votes

5

Subsequent Event [Member] | Common Class A [Member]

Member's Equity [Line Items]

Dividend declared (in dollars per share)

$0.30

Equity_and_EquityBased_Compens3

Equity and Equity-Based Compensation - Equity Classified Awards (Details) (USD $)	0 Months Ended	2 Months Ended	10 Months Ended	12 Months Ended
	Nov. 04, 2014	Dec. 31, 2014	Nov. 04, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2012
Equity [Abstract]
Vesting period of award from the IPO date	8 years
Compensation charge related to the modification of awards	$0
Equity Classified Award [Roll Forward]
Equity classified awards, beginning	16,605,677	16,605,677	18,243,398	18,243,398	15,057,283	0	15,187,787
Fair value of purchased interest			4,035,926		5,925,572	17,253,451
Reclassification from liability-based awards						-2,065,664
Cash received for purchased interest			-1,708,378		-1,000,097
Amortization of granted and purchased interests			-3,965,269	-1,808,850	-1,739,360	-130,504
Impact of conversion and change in vesting of member interests in Predecessor		-8,391,490
Amortization of Holdings LP Interests		-171,129
Equity classified awards, ending		8,043,058	16,605,677	8,043,058	18,243,398	15,057,283	15,187,787
Unrecognized compensation costs		8,043,058		8,043,058
Period for recognition of unrecognized compensation costs				7 years 9 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost				$14,975,717

Equity_and_EquityBased_Compens4

Equity and Equity-Based Compensation - Liability Classified Awards (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liability Classified Awards [Roll Forward]
Liability classified awards, beginning	$129,001	$0	$1,382,720
Cash received for purchased interests	14,129	129,001	682,944
Compensation expense	228,140	123,019	2,729,961
Payment of liabilities	-228,140	-123,019	-2,729,961
Reclassification to equity-based awards			-2,065,664
Impact of conversion of member interests in Predecessor	-143,130
Issuance of stock appreciation rights	3,465
Liability classified awards, ending	$3,465	$129,001	$0

Equity_and_EquityBased_Compens5

Equity and Equity-Based Compensation - 2014 Omnibus Incentive Plan (Details) (USD $)	2 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	5,658,970
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted	90,500
Omnibus Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		5,658,970
Equity-based compensation expense		$816,680
Omnibus Incentive Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted		1,174,748
Equity-based compensation expense		429,626
Omnibus Incentive Plan 2014 [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense		383,589
Omnibus Incentive Plan 2014 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted		90,500
Equity-based compensation expense		$3,465

Equity_and_EquityBased_Compens6

Equity and Equity-Based Compensation - Restricted Stock Units, Narrative (Details) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvesting period	3 years
Assumed forfeiture rate	5.00%
Total compensation expense expected to be recognized in future periods	$15,036,895
Weighted average period for recognition of compensation expense	5 years 9 months 29 days
Fourth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Fifth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Sixth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Salable rate	25.00%
Seventh Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate	25.00%
Eighth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate	25.00%
Ninth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate	25.00%

Equity_and_EquityBased_Compens7

Equity and Equity-Based Compensation - Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)	2 Months Ended
	Dec. 31, 2014
Number of Shares
Beginning balance	0
Vested	0
Forfeited	0
Ending balance	1,174,748
Weighted Average Grant Date Fair Value Per Unit
Beginning balance (in dollars per share)	$0
Vested (in dollars per share)	$0
Forfeited (in dollars per share)	$0
Ending balance (in dollars per share)	$17
IPO [Member]
Number of Shares
Granted	1,174,748
Weighted Average Grant Date Fair Value Per Unit
Granted (in dollars per share)	$17
Post-IPO [Member]
Number of Shares
Granted	0
Weighted Average Grant Date Fair Value Per Unit
Granted (in dollars per share)	$0

Equity_and_EquityBased_Compens8

Equity and Equity-Based Compensation - Valuation Assumptions (Details) (USD $)	2 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	5,658,970
Options [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		3,894,968
Strike price (in dollars per share)	18.7	$18.70
Contractual term		10 years
Expected dividend yield		7.06%
Expected volatility		29.50%
Risk-free rate		2.30%
Grant date fair value (in dollars per share)		$1.78
Options [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		1,714,002
Strike price (in dollars per share)	18.7	$18.70
Contractual term		5 years
Expected dividend yield		7.06%
Expected volatility		29.50%
Risk-free rate		1.53%
Grant date fair value (in dollars per share)		$1.67
Options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		50,000
Strike price (in dollars per share)	18.7	$18.70
Contractual term		5 years
Expected dividend yield		7.06%
Expected volatility		29.50%
Risk-free rate		1.53%
Grant date fair value (in dollars per share)		$1.62

Equity_and_EquityBased_Compens9

Equity and Equity-Based Compensation - Options, Narrative (Details) (USD $)	2 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Nov. 04, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	5,658,970
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvesting period		3 years
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense	7,718,058	7,718,058
Assumed forfeiture rate		5.00%
Weighted average period for recognition of compensation expense		4 years 6 months 28 days
Options [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		3,894,968
Contractual term		10 years
Grant date fair value		6,933,043
Service period		6 years
Options [Member] | Employees [Member] | Fourth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Options [Member] | Employees [Member] | Fifth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Options [Member] | Employees [Member] | Sixth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate		25.00%
Vesting percentage		33.33%
Options [Member] | Employees [Member] | Seventh Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate		25.00%
Options [Member] | Employees [Member] | Eighth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate		25.00%
Options [Member] | Employees [Member] | Ninth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salable rate		25.00%
Options [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		1,714,002
Contractual term		5 years
Vesting period		2 years
Options [Member] | Officer [Member] | First Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
Options [Member] | Officer [Member] | Second Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
Options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		50,000
Contractual term		5 years
Grant date fair value		2,943,383
Options [Member] | Director [Member] | IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
IPO share price (in dollars per share)			$17

Recovered_Sheet1

Equity and Equity-Based Compensation - Option Activity (Details) (USD $)	2 Months Ended
	Dec. 31, 2014
Number of Shares
Beginning balance	0
Granted	5,658,970
Vested	0
Forfeited or expired	0
Ending balance	5,658,970
Exercisable at end of period	0
Expected to vest after end of period	4,654,091
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$0
Granted (in dollars per share)	$18.70
Vested (in dollars per share)	$0
Forfeited or expired (in dollars per share)	$0
Ending balance (in dollars per share)	$18.70
Exercisable at end of period (in dollars per share)	$0
Expected to vest after end of period (in dollars per share)	$18.70
Weighted average remaining life, granted	8 years 3 months 10 days
Weighted average remaining life, outstanding	8 years 3 months 10 days
Weighted average remaining life, expected to vest	8 years 3 months 10 days
Aggregate intrinsic value, exercisable	$0
Aggregate intrinsic value, expected to vest	$0

Recovered_Sheet2

Equity and Equity-Based Compensation - Stock Appreciation Rights (Details) (Stock Appreciation Rights (SARs) [Member], USD $)	2 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Nov. 04, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period		6 years
Assumed forfeiture rate		5.00%
Total compensation expense expected to be recognized in future periods	$121,292	$121,292
Number of Shares
Beginning balance	0
Granted	90,500
Vested	0
Forfeited	0
Ending balance	90,500	90,500
Weighted Average Grant Date Fair Value Per Unit
Beginning balance (in dollars per share)	$0
Granted (in dollars per share)	$1.78
Vested (in dollars per share)	$0
Forfeited (in dollars per share)	$0
Ending balance (in dollars per share)	$1.78	$1.78
IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
IPO share price (in dollars per share)			$17

Income_Taxes_Components_of_the

Income Taxes - Components of the provision (benefit) for income taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision:
Federal	$291,530	$0	$0
State and local	69,522	0	0
Total current expense	361,052	0	0
Deferred benefit:
Federal	-1,992,191	0	0
State and local	-246,619	0	0
Total deferred benefit	-2,238,810	0	0
Income tax benefit	($1,877,758)	$0	$0

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of the U.S. statutory income tax rate (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax rate (as a percent)	35.00%	35.00%	35.00%
Provision at Federal statutory tax rate	$12,557,925	$0	$0
State and local taxes, net of federal benefit	-116,882	0	0
Change in tax status	-1,089,600	0	0
Income attributable to Predecessor not subject to tax	-13,240,665	0	0
Effect of permanent differences	11,464	0	0
Income tax benefit	($1,877,758)	$0	$0

Income_Taxes_Deferred_tax_asse

Income Taxes - Deferred tax assets and liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss carryforwards	3,443,350	$0
Reserves and accruals	1,649,929	0
Share-based compensation	340,339	0
Step-up related to purchase of 12% interest in Fifth Street Holdings	55,312,497	0
Other	3,320	0
Total deferred tax assets	60,749,435	0
Deferred tax liabilities:
Property and equipment and other long-lived assets	-2,269,026	0
Other	-508,370	0
Total deferred liabilities	-2,777,396	0
Total net deferred tax assets	57,972,039	0
Operating loss carryforward	8,800,000
Fifth Street Holdings L.P. [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	12.00%
Minimum [Member]
Deferred tax liabilities:
Income Tax Examination, Examination Period	4 years
Maximum [Member]
Deferred tax liabilities:
Income Tax Examination, Examination Period	5 years

Earnings_per_Share_Details

Earnings per Share (Details) (USD $)

2 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2014

Sep. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Jun. 30, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Net income attributable to Fifth Street Asset Management Inc.

$528,577

$528,577

$0

$0

$0

$0

$0

$0

$0

$528,577

$0

$0

Weighted average shares of Class A common stock outstanding - Basic and Diluted from November 4, 2014 through December 31, 2014

6,000,033

Net income per share attributable to Fifth Street Asset Management Inc. Class A common stock - Basic and Diluted (in dollars per share)

$0.09

$0.09

Partnership Interests [Member]

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Antidilutive securities (in shares)

44,000,000

Restricted Stock Units (RSUs) [Member]

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Antidilutive securities (in shares)

1,174,748

Common Class A [Member]

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Antidilutive securities (in shares)

5,658,970

Common Class A [Member]

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Weighted average shares of Class A common stock outstanding - Basic and Diluted from November 4, 2014 through December 31, 2014

6,000,033

Net income per share attributable to Fifth Street Asset Management Inc. Class A common stock - Basic and Diluted (in dollars per share)

$0.09

Quarterly_Financial_Informatio2

Quarterly Financial Information (unaudited) (Details) (USD $)	0 Months Ended	2 Months Ended	3 Months Ended							6 Months Ended	10 Months Ended	12 Months Ended
	Nov. 04, 2014	Dec. 31, 2014	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Nov. 04, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues			$30,343,024	$25,690,589	$23,767,365	$23,383,272	$17,645,150	$16,840,884	$15,752,732	$23,405,083		$103,206,061	$73,622,038	$54,643,613
Net income	-17,711,945	12,083,875	708,748	14,555,111	14,488,514	14,990,653	4,421,182	10,109,004	10,250,983	9,060,459	44,440,902	38,812,832	39,771,822	32,060,135
Net income attributable to redeemable non-controlling interests in Combined Funds			0	0	0	0	0	0	0	0
Net (income) loss attributable to non-controlling interests in Combined Funds			0	0	0	0	0	0	0	0
Net income attributable to Predecessor			11,375,127	-14,555,111	-14,488,514	-14,990,653	-4,421,182	-10,109,004	-10,250,983	-9,060,459
Net income attributable to non- controlling interests												-11,555,298	0	0
Net income attributable to Fifth Street Asset Management Inc.		528,577	528,577	0	0	0	0	0	0	0		528,577	0	0
Net income per share attributable to Fifth Street Management Inc. Class A common stock - Basic and Diluted		$0.09	$0.09
Weighted average shares of Class A common stock outstanding - Basic and Diluted			6,000,033
Scenario, Previously Reported [Member]
Revenues				25,418,658	23,753,029	23,383,272	17,645,150	16,840,884	15,752,732	23,317,866
Net income				17,536,869	14,859,754	14,990,653	4,421,182	10,109,004	10,250,983	10,968,678
Net income attributable to redeemable non-controlling interests in Combined Funds				-1,072,218	-391,416	0	0	0	0	-872,905
Net (income) loss attributable to non-controlling interests in Combined Funds				-1,909,540	20,176	0	0	0	0	-1,035,314
Net income attributable to Predecessor				0	0	0	0	0	0	0
Net income attributable to Fifth Street Asset Management Inc.				0	0	0	0	0	0	0
Scenario, Adjustment [Member]
Revenues				271,931	14,336	0	0	0	0	87,217
Net income				-2,981,758	-371,240	0	0	0	0	-1,908,219
Net income attributable to redeemable non-controlling interests in Combined Funds				1,072,218	391,416	0	0	0	0	872,905
Net (income) loss attributable to non-controlling interests in Combined Funds				1,909,540	-20,176	0	0	0	0	1,035,314
Net income attributable to Predecessor				-14,555,111	-14,488,514	-14,990,653	-4,421,182	-10,109,004	-10,250,983	-9,060,459
Net income attributable to Fifth Street Asset Management Inc.				0	0	0	0	0	0	0
Fifth Street Holdings L.P. [Member]
Net income attributable to non- controlling interests			-11,555,298	0	0	0	0	0	0	0
Fifth Street Holdings L.P. [Member] | Scenario, Previously Reported [Member]
Net income attributable to non- controlling interests				0	0	0	0	0	0	0
Fifth Street Holdings L.P. [Member] | Scenario, Adjustment [Member]
Net income attributable to non- controlling interests				0	0	0	0	0	0	0
Fifth Street Management Group [Member]
Net income attributable to non- controlling interests			0	0	0	0	0	0	0	0
Fifth Street Management Group [Member] | Scenario, Previously Reported [Member]
Net income attributable to non- controlling interests				14,555,111	14,488,514	14,990,653	4,421,182	10,109,004	10,250,983	9,060,459
Fifth Street Management Group [Member] | Scenario, Adjustment [Member]
Net income attributable to non- controlling interests				($14,555,111)	($14,488,514)	($14,990,653)	($4,421,182)	($10,109,004)	($10,250,983)	($9,060,459)

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	0 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 15, 2015	Dec. 22, 2014	Feb. 24, 2015
Common Class A [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend declared (in dollars per share)	$0.30
FSM [Member] | Immediate Family Member of Management or Principal Owner [Member] | Limited Liability Company Agreement [Member]
Subsequent Event [Line Items]
Capital contribution		$80
Ownership percentage		80.00%
FSM [Member] | Immediate Family Member of Management or Principal Owner [Member] | Limited Liability Company Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to to acquire note receivable			$800
FSM [Member] | Notes Receivable [Member] | Immediate Family Member of Management or Principal Owner [Member] | Limited Liability Company Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Interest rate (as a percent)			8.00%
FSM [Member] | Common Class A [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend declared (in dollars per share)	$0.30