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Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Detail)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Significant Accounting Policies [Line Items]    
Percentage of net service revenue 100.00%lhcg_RevenueByPayor 100.00%lhcg_RevenueByPayor
Medicare revenue    
Significant Accounting Policies [Line Items]    
Percentage of net service revenue 74.70%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicareMember		 78.70%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicareMember
Medicaid revenue    
Significant Accounting Policies [Line Items]    
Percentage of net service revenue 1.40%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicaidMember		 1.30%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicaidMember
Other revenue    
Significant Accounting Policies [Line Items]    
Percentage of net service revenue 23.90%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_OtherPayorMember		 20.00%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_OtherPayorMember