Unaudited Summarized Quarterly Financial Information - Unaudited Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net service revenue	$ 235,443	$ 230,797	$ 226,031	$ 222,552	$ 218,993	$ 204,122	$ 200,172	$ 193,079	$ 914,823	$ 816,366	$ 733,632
Gross margin	91,354	89,965	88,903	86,951	90,053	83,249	83,533	78,653	357,173	335,488	298,857
Net Income Attributable to LHC Group Inc.'s Common Stockholders	$ 9,817	$ 9,616	$ 9,464	$ 7,686	$ 7,735	$ 8,845	$ 8,950	$ 6,805	$ 36,583	$ 32,335	$ 21,837
Earnings Per Share - Basic:
Net income attributable to LHC Group, Inc.' common stockholders	$ 0.56	$ 0.55	$ 0.54	$ 0.44	$ 0.44	$ 0.51	$ 0.51	$ 0.39	$ 2.08	$ 1.86	$ 1.27
Earnings Per Share - Diluted:
Net income attributable to LHC Group, Inc.' common stockholders	$ 0.55	$ 0.54	$ 0.54	$ 0.44	$ 0.44	$ 0.50	$ 0.51	$ 0.39	$ 2.07	$ 1.84	$ 1.26
Weighted Average Shares Outstanding:
Basic	17,597,190	17,588,163	17,566,097	17,485,766	17,447,691	17,436,731	17,410,971	17,322,791	17,559,477	17,405,379	17,229,026
Diluted	17,764,066	17,719,473	17,685,147	17,633,549	17,647,483	17,610,953	17,529,100	17,489,483	17,682,820	17,547,531	17,315,333