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Accounts Receivable - Textual (Details) | Dec. 31, 2016 | Dec. 31, 2015
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Receivables [Abstract] |  |
Allowance for doubtful accounts as a percentage of total patient due accounts receivable balance (percent) | 15.60% | 12.50%

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- Definition Allowance for doubtful accounts expressed as a percentage of gross patient accounts receivable. + References No definition available. + Details
Name: | hls_AllowanceForDoubtfulAccountsAsPercentageOfPatientAccountsReceivable
Namespace Prefix: | hls_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration