Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 226,031	$ 200,172	$ 448,583	$ 393,251
Cost of service revenue	137,128	116,639	272,729	231,065
Provision for bad debts	3,782	4,805	8,383	10,064
General and administrative expenses	68,261	60,250	134,297	119,264
Loss on disposal of assets	1,043	120	1,247	404
Operating income	15,817	18,358	31,927	32,454
Interest expense	(466)	(554)	(1,351)	(1,099)
Income before income taxes and noncontrolling interest	15,351	17,804	30,576	31,355
Income tax expense	3,596	6,220	8,938	10,949
Net income	11,755	11,584	21,638	20,406
Less net income attributable to noncontrolling interests	2,291	2,634	4,488	4,651
Net income attributable to LHC Group, Inc.’s common stockholders	9,464	8,950	17,150	15,755
Total assets	619,645	509,045	619,645	509,045	$ 566,054
Home health services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	163,174	153,272	324,561	299,864
Cost of service revenue	97,590	87,045	194,302	172,591
Provision for bad debts	2,618	3,645	6,073	8,121
General and administrative expenses	51,182	47,488	100,655	93,727
Loss on disposal of assets	706	88	791	303
Operating income	11,078	15,006	22,740	25,122
Interest expense	(350)	(438)	(1,028)	(868)
Income before income taxes and noncontrolling interest	10,728	14,568	21,712	24,254
Income tax expense	2,043	4,740	5,893	8,397
Net income	8,685	9,828	15,819	15,857
Less net income attributable to noncontrolling interests	1,555	2,251	3,149	3,772
Net income attributable to LHC Group, Inc.’s common stockholders	7,130	7,577	12,670	12,085
Total assets	429,780	400,906	429,780	400,906
Community-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	10,587	10,312	21,030	20,085
Cost of service revenue	7,829	7,456	15,556	14,356
Provision for bad debts	216	691	298	871
General and administrative expenses	2,215	2,054	4,294	4,247
Loss on disposal of assets	46	14	46	38
Operating income	281	97	836	573
Interest expense	(23)	(6)	(65)	(12)
Income before income taxes and noncontrolling interest	258	91	771	561
Income tax expense	102	215	330	260
Net income	156	(124)	441	301
Less net income attributable to noncontrolling interests	(14)	(52)	(57)	(72)
Net income attributable to LHC Group, Inc.’s common stockholders	170	(72)	498	373
Total assets	33,247	33,131	33,247	33,131
Hospice Services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	33,905	18,632	64,729	35,483
Cost of service revenue	20,966	10,844	40,593	20,943
Provision for bad debts	792	299	1,567	646
General and administrative expenses	9,425	5,100	18,296	9,961
Loss on disposal of assets	205	11	324	38
Operating income	2,517	2,378	3,949	3,895
Interest expense	(51)	(61)	(142)	(121)
Income before income taxes and noncontrolling interest	2,466	2,317	3,807	3,774
Income tax expense	789	723	1,209	1,343
Net income	1,677	1,594	2,598	2,431
Less net income attributable to noncontrolling interests	498	253	815	499
Net income attributable to LHC Group, Inc.’s common stockholders	1,179	1,341	1,783	1,932
Total assets	118,353	36,178	118,353	36,178
Facility-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	18,365	17,956	38,263	37,819
Cost of service revenue	10,743	11,294	22,278	23,175
Provision for bad debts	156	170	445	426
General and administrative expenses	5,439	5,608	11,052	11,329
Loss on disposal of assets	86	7	86	25
Operating income	1,941	877	4,402	2,864
Interest expense	(42)	(49)	(116)	(98)
Income before income taxes and noncontrolling interest	1,899	828	4,286	2,766
Income tax expense	662	542	1,506	949
Net income	1,237	286	2,780	1,817
Less net income attributable to noncontrolling interests	252	182	581	452
Net income attributable to LHC Group, Inc.’s common stockholders	985	104	2,199	1,365
Total assets	$ 38,265	$ 38,830	$ 38,265	$ 38,830