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Financing Obligations - Narrative (Details) - Financing Obligation $ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2019 USD ($)	Oct. 31, 2017 USD ($) property	Dec. 31, 2018 USD ($) property
Debt Instrument [Line Items]
Sale leaseback transaction, number of properties | property		42	2
Sale leaseback transaction, gross proceeds | $	$ 4.7	$ 119.5	$ 6.4

X

- Definition

Finance Lease, Liability, Number of Properties

+ References

No definition available.

+ Details

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Namespace Prefix:	hri_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Amount of cash inflow from lease payment, classified as operating activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919320-209978

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 45
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919327-209978

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: