Other Acquisitions and Joint Ventures - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Line Items]
Cash paid to for acquisitions	$ 2,770	$ 449
Goodwill related to noncontrolling interests	1,396
Nason Home Health And First Choice Home Health Care
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Line Items]
Aggregate purchase price	2,900
Cash paid to for acquisitions	2,800
Payments to Acquire Businesses, Gross	2,770
Accounts Receivable Acquired	133
Trade Name Acquired	376
Certificate of Need/Licenses Acquired	378
Other Assets and (Liabilities), Net; Acquired (Assumed)	(23)
Fair Value of Assets Acquired	955
Acquired noncontrolling interest	1,815
Goodwill, Acquired During Period, Including Noncontrolling Interest of $34,313	3,630
Finite-lived Intangible Assets Acquired	$ 91