Goodwill and Intangibles - Schedule of Changes in Recorded Goodwill by Reporting Unit (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 392,601
Goodwill from acquisitions	2,234
Goodwill related to noncontrolling interests	1,396
Other	411
Balance at end of period	396,642
Home health reporting unit
Goodwill [Roll Forward]
Balance at beginning of period	261,456
Goodwill from acquisitions	2,234
Goodwill related to noncontrolling interests	1,396
Other	0
Balance at end of period	265,086
Hospice reporting unit
Goodwill [Roll Forward]
Balance at beginning of period	88,814
Goodwill from acquisitions	0
Goodwill related to noncontrolling interests	0
Balance at end of period	88,814
Community-based reporting unit
Goodwill [Roll Forward]
Balance at beginning of period	28,541
Goodwill from acquisitions	0
Goodwill related to noncontrolling interests	0
Balance at end of period	28,541
Facility-based reporting unit
Goodwill [Roll Forward]
Balance at beginning of period	13,790
Goodwill from acquisitions	0
Goodwill related to noncontrolling interests	0
Other	411
Balance at end of period	$ 14,201