Subsequent Event - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Agency	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Subsequent Event [Line Items]
Cash paid for acquisitions | $	$ 23,156	$ 70,572	$ 73,933
LifePoint [Member]
Subsequent Event [Line Items]
Cash paid for acquisitions | $	$ 11,500
Home Health Reporting Unit [Member] | LifePoint [Member]
Subsequent Event [Line Items]
Number of Agencies Operated | Agency	39
Hospice Reporting Unit [Member] | LifePoint [Member]
Subsequent Event [Line Items]
Number of Agencies Operated | Agency	12