Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Other Assets, Amount From Government Payors	$ 16.9
Period of joint venture buy/sell option		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