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Share-Based Payments - Textual (Details)
In Millions, unless otherwise specified
 1 Months Ended
Feb. 28, 2015
Restricted Stock [Member]  
Share-based Compensation (Textual) [Abstract]  
Restricted Stock Awards Issued 0.5hls_ShareBasedCompensationEquityInstrumentsOtherThanOptionsIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock Awards Issued, Service Requirement Only 0.2hls_ShareBasedCompensationEquityInstrumentsOtherThanOptionsServiceRequirementOnlyIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Stock Options [Member]  
Share-based Compensation (Textual) [Abstract]  
Stock Options Granted 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember