Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax payable as an unrecognized tax benefit	$ 3.4lhcg_TaxPayableAsUnrecognizedTaxBenefit
Interest Expense For Unrecognized Tax Position	$ 0.2	$ 0.2	$ 0.1

The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of balance sheet date. Amount is rounded.

No definition available.

Name:	lhcg_TaxPayableAsUnrecognizedTaxBenefit
Namespace Prefix:	lhcg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration