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Summary of Significant Accounting Policies - Percentage of Net Service Revenue Contributed from Each Reporting Segment (Detail) (Sales Revenue, Segment [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Health Care Organization, Revenue [Abstract]      
Percentage of net service revenue 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Home-based services [Member]      
Health Care Organization, Revenue [Abstract]      
Percentage of net service revenue 80.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_HomeBasedServicesMember		 80.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_HomeBasedServicesMember		 80.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_HomeBasedServicesMember
Hospice Entity [Member]      
Health Care Organization, Revenue [Abstract]      
Percentage of net service revenue 9.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_HospiceEntityMember		 8.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_HospiceEntityMember		 7.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_HospiceEntityMember
Facility-based services [Member]      
Health Care Organization, Revenue [Abstract]      
Percentage of net service revenue 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_FacilityBasedServicesMember		 11.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_FacilityBasedServicesMember		 11.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= lhcg_FacilityBasedServicesMember