Segment Information- Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 218,993	$ 204,122	$ 200,172	$ 193,079	$ 193,371	$ 187,713	$ 188,867	$ 163,681	$ 816,366	$ 733,632	$ 658,283
Cost of service revenue									480,878	434,775	383,464
Provision for bad debts									19,243	15,780	13,929
General and administrative expenses									248,629	233,945	213,633
Impairment of intangibles and other									1,273	3,646	520
Operating income									66,343	45,486	46,737
Interest expense									(2,302)	(2,486)	(1,995)
Non-operating income									457	265	263
Income from continuing operations before income taxes and noncontrolling interests									64,498	43,265	45,005
Income tax expense									22,848	14,513	15,859
Income from continuing operations									41,650	28,752	29,146
Less net income attributable to noncontrolling interests									9,315	6,915	6,804
Net Income Attributable to LHC Group Inc.'s Common Stockholders	7,735	$ 8,845	$ 8,950	$ 6,805	5,534	$ 6,174	$ 6,061	$ 4,068	32,335	21,837	22,342
Total assets	566,054				491,739				566,054	491,739	422,226
Home-based services [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									613,188	564,966	523,512
Cost of service revenue									354,750	329,856	302,589
Provision for bad debts									15,736	13,072	11,623
General and administrative expenses									191,135	187,281	175,056
Impairment of intangibles and other									1,245	3,269	344
Operating income									50,322	31,488	33,900
Interest expense									(1,819)	(1,969)	(1,591)
Non-operating income									397	201	142
Income from continuing operations before income taxes and noncontrolling interests									48,900	29,720	32,451
Income tax expense									17,173	10,999	12,634
Income from continuing operations									31,727	18,721	19,817
Less net income attributable to noncontrolling interests									7,424	5,121	4,596
Net Income Attributable to LHC Group Inc.'s Common Stockholders									24,303	13,600	15,221
Total assets	394,392				386,511				394,392	386,511	355,858
Facility-based services [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									76,122	73,347	75,392
Cost of service revenue									46,146	45,504	44,265
Provision for bad debts									689	926	1,086
General and administrative expenses									22,471	21,231	21,349
Impairment of intangibles and other									0	175	1
Operating income									6,816	5,511	8,691
Interest expense									(207)	(249)	(195)
Non-operating income									19	19	95
Income from continuing operations before income taxes and noncontrolling interests									6,628	5,281	8,591
Income tax expense									2,347	1,454	1,517
Income from continuing operations									4,281	3,827	7,074
Less net income attributable to noncontrolling interests									958	708	1,252
Net Income Attributable to LHC Group Inc.'s Common Stockholders									3,323	3,119	5,822
Total assets	38,786				36,354				38,786	36,354	36,569
Hospice Entity [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									85,854	67,621	56,172
Cost of service revenue									50,906	39,804	34,212
Provision for bad debts									1,002	909	1,215
General and administrative expenses									26,517	18,882	16,210
Impairment of intangibles and other									0	202	175
Operating income									7,429	7,824	4,360
Interest expense									(253)	(249)	(200)
Non-operating income									38	43	26
Income from continuing operations before income taxes and noncontrolling interests									7,214	7,618	4,186
Income tax expense									2,541	1,955	1,797
Income from continuing operations									4,673	5,663	2,389
Less net income attributable to noncontrolling interests									1,077	1,122	956
Net Income Attributable to LHC Group Inc.'s Common Stockholders									3,596	4,541	1,433
Total assets	101,641				34,847				101,641	34,847	28,557
Community-Based Services [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									41,202	27,698	3,207
Cost of service revenue									29,076	19,611	2,398
Provision for bad debts									1,816	873	5
General and administrative expenses									8,506	6,551	1,018
Impairment of intangibles and other									28	0	0
Operating income									1,776	663	(214)
Interest expense									(23)	(19)	(9)
Non-operating income									3	2	0
Income from continuing operations before income taxes and noncontrolling interests									1,756	646	(223)
Income tax expense									787	105	(89)
Income from continuing operations									969	541	(134)
Less net income attributable to noncontrolling interests									(144)	(36)	0
Net Income Attributable to LHC Group Inc.'s Common Stockholders									1,113	577	(134)
Total assets	$ 31,235				$ 34,027				$ 31,235	$ 34,027	$ 1,242