Segment Information - Summary of segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 524,835	$ 512,871
Cost of service revenue (excluding depreciation and amortization)	310,272	321,202
General and administrative expenses	163,249	157,866
Impairment of intangibles and other	177	0
Operating income	51,137	33,803
Interest expense	(263)	(2,768)
Income before income taxes and noncontrolling interest	50,874	31,035
Income tax expense (benefit)	9,441	3,359
Net income	41,433	27,676
Less net income (loss) attributable to noncontrolling interests	6,774	5,652
Net income attributable to LHC Group, Inc.’s common stockholders	34,659	22,024
Total assets	2,522,854	2,212,282	$ 2,483,354
Home health services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	373,828	367,821
Cost of service revenue (excluding depreciation and amortization)	212,373	220,440
General and administrative expenses	119,397	116,023
Impairment of intangibles and other	177
Operating income	41,881	31,358
Interest expense	(182)	(1,900)
Income before income taxes and noncontrolling interest	41,699	29,458
Income tax expense (benefit)	7,890	3,289
Net income	33,809	26,169
Less net income (loss) attributable to noncontrolling interests	4,849	4,606
Net income attributable to LHC Group, Inc.’s common stockholders	28,960	21,563
Total assets	1,785,486	1,548,224
Hospice services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	62,734	60,531
Cost of service revenue (excluding depreciation and amortization)	38,570	38,034
General and administrative expenses	18,127	16,626
Impairment of intangibles and other	0
Operating income	6,037	5,871
Interest expense	(36)	(303)
Income before income taxes and noncontrolling interest	6,001	5,568
Income tax expense (benefit)	1,067	608
Net income	4,934	4,960
Less net income (loss) attributable to noncontrolling interests	1,015	967
Net income attributable to LHC Group, Inc.’s common stockholders	3,919	3,993
Total assets	308,009	251,354
Home and community-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	49,125	48,464
Cost of service revenue (excluding depreciation and amortization)	34,872	38,453
General and administrative expenses	11,529	11,459
Impairment of intangibles and other	0
Operating income	2,724	(1,448)
Interest expense	(24)	(266)
Income before income taxes and noncontrolling interest	2,700	(1,714)
Income tax expense (benefit)	518	(206)
Net income	2,182	(1,508)
Less net income (loss) attributable to noncontrolling interests	279	(155)
Net income attributable to LHC Group, Inc.’s common stockholders	1,903	(1,353)
Total assets	262,538	252,846
Facility-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	33,369	29,681
Cost of service revenue (excluding depreciation and amortization)	21,175	20,342
General and administrative expenses	11,257	10,380
Impairment of intangibles and other	0
Operating income	937	(1,041)
Interest expense	(14)	(219)
Income before income taxes and noncontrolling interest	923	(1,260)
Income tax expense (benefit)	57	(199)
Net income	866	(1,061)
Less net income (loss) attributable to noncontrolling interests	657	243
Net income attributable to LHC Group, Inc.’s common stockholders	209	(1,304)
Total assets	97,692	90,791
HCI
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	5,779	6,374
Cost of service revenue (excluding depreciation and amortization)	3,282	3,933
General and administrative expenses	2,939	3,378
Impairment of intangibles and other	0
Operating income	(442)	(937)
Interest expense	(7)	(80)
Income before income taxes and noncontrolling interest	(449)	(1,017)
Income tax expense (benefit)	(91)	(133)
Net income	(358)	(884)
Less net income (loss) attributable to noncontrolling interests	(26)	(9)
Net income attributable to LHC Group, Inc.’s common stockholders	(332)	(875)
Total assets	$ 69,129	$ 69,067