Acquisitions and Joint Ventures - Additional Information (Detail) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) Agency	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Business Combination, Consideration Transferred | $	$ 35,600
Payments to Acquire Businesses, Gross | $	$ 22,704	$ 11,515	$ 10,400
LifePoint
Business Acquisition [Line Items]
Number of home health agencies acquired	19
Number of hospice agencies acquired	12
Number of in-patient hospice unit agencies acquired	1
Other acquisitions
Business Acquisition [Line Items]
Number of home health agencies acquired	5
Number of hospice agencies acquired	7
Number of in-patient hospice unit agencies acquired	1
Number of pharmacies acquired	1