Goodwill and Other Intangibles, Net - Schedule of Changes in Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance at beginning of period	$ 392,601	$ 307,317
Acquisitions	765,688	52,003
Noncontrolling interests	3,803	34,409
Adjustments and disposals	(375)	(1,128)
Balance at end of period	1,161,717	392,601
Home health
Goodwill [Roll Forward]
Balance at beginning of period	261,456	210,839
Acquisitions	558,628	30,623
Noncontrolling interests	3,297	21,469
Adjustments and disposals	(779)	(1,475)
Balance at end of period	822,602	261,456
Hospice
Goodwill [Roll Forward]
Balance at beginning of period	88,814	64,234
Acquisitions	29,263	15,000
Noncontrolling interests	506	9,580
Adjustments and disposals	0
Balance at end of period	118,583	88,814
Home and community- based
Goodwill [Roll Forward]
Balance at beginning of period	28,541	18,820
Acquisitions	137,042	6,220
Noncontrolling interests		3,501
Adjustments and disposals		0
Balance at end of period	165,583	28,541
Facility-based
Goodwill [Roll Forward]
Balance at beginning of period	13,790	13,424
Acquisitions	0	160
Noncontrolling interests	0	(141)
Adjustments and disposals	404	347
Balance at end of period	14,194	13,790
Healthcare innovations
Goodwill [Roll Forward]
Balance at beginning of period	0	0
Acquisitions	40,755
Noncontrolling interests	0
Balance at end of period	$ 40,755	$ 0