Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 200,172	$ 188,867	$ 393,251	$ 352,548
Cost of service revenue	116,639	111,527	231,065	208,861
Provision for bad debts	4,805	4,363	10,064	7,725
General and administrative expenses	60,370	59,723	119,668	114,302
Operating income	18,358	13,254	32,454	21,660
Interest expense	(554)	(830)	(1,099)	(1,218)
Income before income taxes and noncontrolling interest	17,804	12,424	31,355	20,442
Income tax expense	6,220	4,352	10,949	7,275
Net income (loss)	11,584	8,072	20,406	13,167
Less net income attributable to noncontrolling interests	2,634	2,011	4,651	3,038
Net income (loss) attributable to LHC Group, Inc.’s common stockholders	8,950	6,061	15,755	10,129
Total assets	509,045	497,625	509,045	497,625	$ 491,739
Home health services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	153,272	145,861	299,864	273,654
Cost of service revenue	87,045	84,278	172,591	160,078
Provision for bad debts	3,645	3,701	8,121	6,324
General and administrative expenses	47,576	47,661	94,030	91,855
Operating income	15,006	10,221	25,122	15,397
Interest expense	(438)	(657)	(868)	(964)
Income before income taxes and noncontrolling interest	14,568	9,564	24,254	14,433
Income tax expense	4,740	3,405	8,397	5,675
Net income (loss)	9,828	6,159	15,857	8,758
Less net income attributable to noncontrolling interests	2,251	1,541	3,772	2,148
Net income (loss) attributable to LHC Group, Inc.’s common stockholders	7,577	4,618	12,085	6,610
Total assets	400,906	390,542	400,906	390,542
Hospice services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	18,632	17,068	35,483	32,290
Cost of service revenue	10,844	10,151	20,943	19,048
Provision for bad debts	299	93	646	198
General and administrative expenses	5,111	4,789	9,999	9,233
Operating income	2,378	2,035	3,895	3,811
Interest expense	(61)	(83)	(121)	(122)
Income before income taxes and noncontrolling interest	2,317	1,952	3,774	3,689
Income tax expense	723	530	1,343	876
Net income (loss)	1,594	1,422	2,431	2,813
Less net income attributable to noncontrolling interests	253	335	499	536
Net income (loss) attributable to LHC Group, Inc.’s common stockholders	1,341	1,087	1,932	2,277
Total assets	36,178	35,530	36,178	35,530
Community-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	10,312	8,399	20,085	9,286
Cost of service revenue	7,456	5,945	14,356	6,589
Provision for bad debts	691	367	871	398
General and administrative expenses	2,068	2,065	4,285	2,388
Operating income	97	22	573	(89)
Interest expense	(6)	(7)	(12)	(10)
Income before income taxes and noncontrolling interest	91	15	561	(99)
Income tax expense	215	31	260	54
Net income (loss)	(124)	(16)	301	(153)
Less net income attributable to noncontrolling interests	(52)	(4)	(72)	(4)
Net income (loss) attributable to LHC Group, Inc.’s common stockholders	(72)	(12)	373	(149)
Total assets	33,131		33,131
Facility-based services
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	17,956	17,539	37,819	37,318
Cost of service revenue	11,294	11,153	23,175	23,146
Provision for bad debts	170	202	426	805
General and administrative expenses	5,615	5,208	11,354	10,826
Operating income	877	976	2,864	2,541
Interest expense	(49)	(83)	(98)	(122)
Income before income taxes and noncontrolling interest	828	893	2,766	2,419
Income tax expense	542	386	949	670
Net income (loss)	286	507	1,817	1,749
Less net income attributable to noncontrolling interests	182	139	452	358
Net income (loss) attributable to LHC Group, Inc.’s common stockholders	104	368	1,365	1,391
Total assets	$ 38,830	$ 36,841	$ 38,830	$ 36,841