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Acquisitions and Disposals - Schedule of Aggregate Consideration Paid and Recognized Identified Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consideration      
Cash $ 73,933us-gaap_PaymentsToAcquireBusinessesGross $ 26,920us-gaap_PaymentsToAcquireBusinessesGross $ 6,758us-gaap_PaymentsToAcquireBusinessesGross
Fair value of total consideration transferred 73,933us-gaap_BusinessCombinationConsiderationTransferred1    
Recognized amounts of identifiable assets acquired and liabilities assumed      
Account Receivable 8,667us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables    
Fixed Assets 495us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment    
Accounts Payable 867us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable    
Other Assets and (Liabilities), Net 2,456lhcg_AmountOfAcquisitionCostAllocatedToOtherAssetsLiabilitiesNotSeparatelyStated    
Total Identifiable Assets 28,845us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet    
Noncontrolling Interest 238us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue    
Goodwill Including Noncontrolling Interest of $75 45,326lhcg_GoodwillIncludingNoncontrollingInterest    
Licensing Agreements [Member]      
Recognized amounts of identifiable assets acquired and liabilities assumed      
Business acquisition, purchase price allocation, Intangible Assets 8,615us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
   
Trade Names [Member]      
Recognized amounts of identifiable assets acquired and liabilities assumed      
Business acquisition, purchase price allocation, Intangible Assets 13,950lhcg_BusinessCombinationrecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFiniteLiveIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
   
Other Identifiable Intangible Assets [Member]      
Recognized amounts of identifiable assets acquired and liabilities assumed      
Business acquisition, purchase price allocation, Intangible Assets $ 441us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lhcg_OtherIdentifiableIntangibleAssetsMember