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Summary of Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 100.00%lhcg_RevenueByPayor 100.00%lhcg_RevenueByPayor 100.00%lhcg_RevenueByPayor
Medicare [Member]      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 75.00%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicareMember		 79.80%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicareMember		 77.90%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicareMember
Medicaid [Member]      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 1.30%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicaidMember		 1.40%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicaidMember		 1.80%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_MedicaidMember
Other [Member]      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 23.70%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_OtherPayorMember		 18.80%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_OtherPayorMember		 20.30%lhcg_RevenueByPayor
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= lhcg_OtherPayorMember