Segment Information - Summary of segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 2,219,622	$ 2,063,204	$ 2,080,241
Cost of service revenue (excluding depreciation and amortization)	1,336,609	1,250,403	1,324,887
General and administrative expenses	696,435	632,847	596,006
Impairment of intangibles and other	937	1,849	7,734
Operating income	185,641	178,105	151,614
Interest expense	(4,338)	(4,129)	(11,155)
Income (loss) before income taxes and noncontrolling interests	181,303	173,976	140,459
Income tax expense (benefit)	37,687	36,043	26,607
Net income	143,616	137,933	113,852
Less net income (loss) attributable to noncontrolling interests	27,888	26,337	18,126
Net income attributable to LHC Group, Inc.’s common stockholders	115,728	111,596	95,726
Total assets	2,895,621	2,483,354	2,140,295
Home Health
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	1,551,542	1,463,779	1,503,393
Cost of service revenue (excluding depreciation and amortization)	901,685	848,663	939,035
General and administrative expenses	501,132	464,568	437,276
Impairment of intangibles and other	937	1,249	7,443
Operating income	147,788	149,299	119,639
Interest expense	(3,103)	(2,856)	(7,762)
Income (loss) before income taxes and noncontrolling interests	144,685	146,443	111,877
Income tax expense (benefit)	30,089	30,435	21,147
Net income	114,596	116,008	90,730
Less net income (loss) attributable to noncontrolling interests	22,060	20,525	14,651
Net income attributable to LHC Group, Inc.’s common stockholders	92,536	95,483	76,079
Total assets	1,719,403	1,741,044	1,486,012
Hospice
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	311,218	243,806	226,922
Cost of service revenue (excluding depreciation and amortization)	194,895	150,675	140,177
General and administrative expenses	89,693	66,454	61,190
Impairment of intangibles and other	0	600	291
Operating income	26,630	26,077	25,264
Interest expense	(529)	(469)	(1,269)
Income (loss) before income taxes and noncontrolling interests	26,101	25,608	23,995
Income tax expense (benefit)	5,344	4,925	4,353
Net income	20,757	20,683	19,642
Less net income (loss) attributable to noncontrolling interests	4,297	4,822	3,979
Net income attributable to LHC Group, Inc.’s common stockholders	16,460	15,861	15,663
Total assets	786,671	301,475	244,105
Home and Community-Based
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	189,561	194,584	208,455
Cost of service revenue (excluding depreciation and amortization)	137,852	150,378	157,817
General and administrative expenses	46,724	45,443	44,025
Impairment of intangibles and other	0	0	0
Operating income	4,985	(1,237)	6,613
Interest expense	(413)	(390)	(1,112)
Income (loss) before income taxes and noncontrolling interests	4,572	(1,627)	5,501
Income tax expense (benefit)	1,069	(357)	1,394
Net income	3,503	(1,270)	4,107
Less net income (loss) attributable to noncontrolling interests	467	(171)	(906)
Net income attributable to LHC Group, Inc.’s common stockholders	3,036	(1,099)	5,013
Total assets	239,314	263,708	249,524
Facility-Based
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	132,098	128,578	111,809
Cost of service revenue (excluding depreciation and amortization)	89,270	85,827	73,274
General and administrative expenses	45,304	43,435	38,358
Impairment of intangibles and other	0	0	0
Operating income	(2,476)	(684)	177
Interest expense	(208)	(297)	(678)
Income (loss) before income taxes and noncontrolling interests	(2,684)	(981)	(501)
Income tax expense (benefit)	(919)	(185)	(204)
Net income	(1,765)	(796)	(297)
Less net income (loss) attributable to noncontrolling interests	1,105	1,193	435
Net income attributable to LHC Group, Inc.’s common stockholders	(2,870)	(1,989)	(732)
Total assets	85,005	103,401	91,337
HCI
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	35,203	32,457	29,662
Cost of service revenue (excluding depreciation and amortization)	12,907	14,860	14,584
General and administrative expenses	13,582	12,947	15,157
Impairment of intangibles and other	0	0	0
Operating income	8,714	4,650	(79)
Interest expense	(85)	(117)	(334)
Income (loss) before income taxes and noncontrolling interests	8,629	4,533	(413)
Income tax expense (benefit)	2,104	1,225	(83)
Net income	6,525	3,308	(330)
Less net income (loss) attributable to noncontrolling interests	(41)	(32)	(33)
Net income attributable to LHC Group, Inc.’s common stockholders	6,566	3,340	(297)
Total assets	$ 65,228	$ 73,726	$ 69,317