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Debt - Borrowing Capacity and Availability and Letters of Credit (Details) - Line of Credit - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Borrowings |  |
Line of Credit Facility [Line Items] |  |
Remaining Capacity |  | $ 7,400,000
ABL Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Letter of credit drawn upon | $ 0 |
ABL Credit Facility | Senior Secured Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Remaining Capacity | 597,200,000 |
Availability Under Borrowing Base Limitation | 597,200,000 |
ABL Credit Facility | Letter of Credit |  |
Line of Credit Facility [Line Items] |  |
Remaining Capacity | 227,200,000 |
Financial Standby Letter of Credit | ABL Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Letter of credit issued and outstanding | $ 22,800,000 |

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- Definition Line of Credit Facility, Remaining Borrowing Capacity Under Borrowing Base Limitation + References No definition available. + Details
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Namespace Prefix: | hri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
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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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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