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Commitments and Contingencies - Incentive Fees (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Carried Interest still subject to contingencies	$ 292,893	$ 303,766
Deferred incentive fee revenue	3,704	6,245
Incentive fees, unrecorded estimate	$ 73,223	$ 75,306

X

- Definition

Incentive Fee Compensation Expense, Unrecorded Estimate

+ References

No definition available.

+ Details

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Namespace Prefix:	hlne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Incentive Fee Revenue, Carried Interest, Unrecorded Estimate

+ References

No definition available.

+ Details

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Namespace Prefix:	hlne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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