Segment Information- Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue	$ 193,371	$ 187,713	$ 188,867	$ 163,681	$ 165,280	$ 164,748	$ 166,302	$ 161,953	$ 733,632	$ 658,283	$ 637,569
Cost of service revenue									434,775	383,464	365,752
Provision for bad debts									15,780	13,929	11,875
General and administrative expenses									233,945	213,633	204,987
Impairment of intangibles and other									3,646	520	650
Operating income									45,486	46,737	54,305
Interest expense									(2,486)	(1,995)	(1,550)
Non-operating income									265	263	184
Income from continuing operations before income taxes and noncontrolling interests									43,265	45,005	52,939
Income tax expense									14,513	15,859	17,511
Income from continuing operations									28,752	29,146	35,428
Less net income attributable to noncontrolling interests									6,915	6,804	7,988
Net Income Attributable to LHC Group Inc.'s Common Stockholders	5,534	6,174	6,061	4,068	4,969	5,297	5,790	6,286	21,837	22,342	27,440
Total assets	491,739				422,226				491,739	422,226	386,894
Home-based services [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									592,664	526,719	513,244
Cost of service revenue									349,467	304,987	292,580
Provision for bad debts									13,945	11,628	9,741
General and administrative expenses									193,832	176,074	168,815
Impairment of intangibles and other									3,269	344	250
Operating income									32,151	33,686	41,858
Interest expense									(1,988)	(1,600)	(1,205)
Non-operating income									203	142	124
Income from continuing operations before income taxes and noncontrolling interests									30,366	32,228	40,777
Income tax expense									11,104	12,545	13,848
Income from continuing operations									19,262	19,683	26,929
Less net income attributable to noncontrolling interests									5,085	4,596	6,153
Net Income Attributable to LHC Group Inc.'s Common Stockholders									14,177	15,087	20,776
Total assets	420,538				356,842				420,538	356,842	326,920
Facility-based services [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									73,347	75,392	73,828
Cost of service revenue									45,504	44,265	43,563
Provision for bad debts									926	1,086	1,282
General and administrative expenses									21,231	21,349	21,512
Impairment of intangibles and other									175	1	400
Operating income									5,511	8,691	7,071
Interest expense									(249)	(195)	(194)
Non-operating income									19	95	51
Income from continuing operations before income taxes and noncontrolling interests									5,281	8,591	6,928
Income tax expense									1,454	1,517	1,892
Income from continuing operations									3,827	7,074	5,036
Less net income attributable to noncontrolling interests									708	1,252	1,024
Net Income Attributable to LHC Group Inc.'s Common Stockholders									3,119	5,822	4,012
Total assets	36,354				36,311				36,354	36,311	36,754
Hospice Entity [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net service revenue									67,621	56,172	50,497
Cost of service revenue									39,804	34,212	29,609
Provision for bad debts									909	1,215	852
General and administrative expenses									18,882	16,210	14,660
Impairment of intangibles and other									202	175	0
Operating income									7,824	4,360	5,376
Interest expense									(249)	(200)	(151)
Non-operating income									43	26	9
Income from continuing operations before income taxes and noncontrolling interests									7,618	4,186	5,234
Income tax expense									1,955	1,797	1,771
Income from continuing operations									5,663	2,389	3,463
Less net income attributable to noncontrolling interests									1,122	956	811
Net Income Attributable to LHC Group Inc.'s Common Stockholders									4,541	1,433	2,652
Total assets	$ 34,847				$ 29,073				$ 34,847	$ 29,073	$ 23,220