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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
Sale Leaseback Transaction [Line Items] |  |  |
Sale leaseback transaction, number of properties | property |  | 42 | 2
Gross proceeds | $ | $ 4.7 | $ 119.5 | $ 6.4

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- 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

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- 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

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

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