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Summary of Significant Accounting Policies - Percentage of Net Service Revenue Earned by Type of Ownership or relationship with Operating Entity (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Health Care organization, Revenue [Abstract]      
Percentage of Net Service Revenue 100.00%lhcg_RevenueByOwnershipType 100.00%lhcg_RevenueByOwnershipType 100.00%lhcg_RevenueByOwnershipType
Wholly-owned Subsidiaries [Member]      
Health Care organization, Revenue [Abstract]      
Percentage of Net Service Revenue 55.00%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 48.80%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 48.10%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Equity Joint Ventures [Member]      
Health Care organization, Revenue [Abstract]      
Percentage of Net Service Revenue 42.00%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_EquityJointVenturesMember		 48.50%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_EquityJointVenturesMember		 49.10%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_EquityJointVenturesMember
License Leasing Arrangements [Member]      
Health Care organization, Revenue [Abstract]      
Percentage of Net Service Revenue 2.00%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_LicenseLeasingArrangementsMember		 1.90%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_LicenseLeasingArrangementsMember		 1.90%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_LicenseLeasingArrangementsMember
Management Services [Member]      
Health Care organization, Revenue [Abstract]      
Percentage of Net Service Revenue 1.00%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_ManagementServicesMember		 0.80%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_ManagementServicesMember		 0.90%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_ManagementServicesMember