Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Litigation Settlement, Amount From Government Payors	$ 16.9
Joint Venture Buy Sell Option Period	30 days

Time frame in which the other joint venture party must either purchase all of the exercising member's membership interests or sell to the exercising member all of the non-exercising member's membership interests in the exercise of a joint venture buy/sell option.

No definition available.

Name:	lhcg_JointVentureBuySellOptionPeriod
Namespace Prefix:	lhcg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration