Segment Information - Summary of segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 512,871	$ 502,585
Cost of service revenue (excluding depreciation and amortization)	321,202	320,992
General and administrative expenses	157,866	145,221
Other intangible impairment charge	0	6,319
Operating income	33,803	30,053
Interest expense	(2,768)	(3,052)
Income before income taxes and noncontrolling interest	31,035	27,001
Income tax expense (benefit)	3,359	3,600
Net income	27,676	23,401
Less net income (loss) attributable to noncontrolling interests	5,652	4,545
Net income attributable to LHC Group, Inc.’s common stockholders	22,024	18,856
Total assets	2,212,282	2,013,857	$ 2,140,295
Home health services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	367,821	363,035
Cost of service revenue (excluding depreciation and amortization)	220,440	226,123
General and administrative expenses	116,023	104,839
Other intangible impairment charge		6,318
Operating income	31,358	25,755
Interest expense	(1,900)	(2,138)
Income before income taxes and noncontrolling interest	29,458	23,617
Income tax expense (benefit)	3,289	3,208
Net income	26,169	20,409
Less net income (loss) attributable to noncontrolling interests	4,606	3,780
Net income attributable to LHC Group, Inc.’s common stockholders	21,563	16,629
Total assets	1,548,224	1,421,000
Hospice services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	60,531	51,736
Cost of service revenue (excluding depreciation and amortization)	38,034	33,176
General and administrative expenses	16,626	14,853
Other intangible impairment charge		1
Operating income	5,871	3,706
Interest expense	(303)	(343)
Income before income taxes and noncontrolling interest	5,568	3,363
Income tax expense (benefit)	608	446
Net income	4,960	2,917
Less net income (loss) attributable to noncontrolling interests	967	601
Net income attributable to LHC Group, Inc.’s common stockholders	3,993	2,316
Total assets	251,354	220,347
Home and community-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	48,464	51,785
Cost of service revenue (excluding depreciation and amortization)	38,453	39,855
General and administrative expenses	11,459	10,982
Other intangible impairment charge		0
Operating income	(1,448)	948
Interest expense	(266)	(301)
Income before income taxes and noncontrolling interest	(1,714)	647
Income tax expense (benefit)	(206)	151
Net income	(1,508)	496
Less net income (loss) attributable to noncontrolling interests	(155)	(310)
Net income attributable to LHC Group, Inc.’s common stockholders	(1,353)	806
Total assets	252,846	226,991
Facility-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	29,681	27,701
Cost of service revenue (excluding depreciation and amortization)	20,342	17,732
General and administrative expenses	10,380	9,177
Other intangible impairment charge		0
Operating income	(1,041)	792
Interest expense	(219)	(180)
Income before income taxes and noncontrolling interest	(1,260)	612
Income tax expense (benefit)	(199)	5
Net income	(1,061)	607
Less net income (loss) attributable to noncontrolling interests	243	481
Net income attributable to LHC Group, Inc.’s common stockholders	(1,304)	126
Total assets	90,791	79,257
HCI
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	6,374	8,328
Cost of service revenue (excluding depreciation and amortization)	3,933	4,106
General and administrative expenses	3,378	5,370
Other intangible impairment charge		0
Operating income	(937)	(1,148)
Interest expense	(80)	(90)
Income before income taxes and noncontrolling interest	(1,017)	(1,238)
Income tax expense (benefit)	(133)	(210)
Net income	(884)	(1,028)
Less net income (loss) attributable to noncontrolling interests	(9)	(7)
Net income attributable to LHC Group, Inc.’s common stockholders	(875)	(1,021)
Total assets	$ 69,067	$ 66,262