Concentration of Risk - Additional Information (Detail)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Percentage Of Net Service Revenue Accounted By Facility	55.00%	58.40%	61.10%

Percentage of net service revenue generated from Louisiana, Mississippi, Alabama, Arkansas, and Tennessee facilities.

No definition available.

Name:	lhcg_PercentageOfNetServiceRevenueAccountedByFacility
Namespace Prefix:	lhcg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant