Acquisitions and Disposals - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Line Items]
Payments to Acquire Businesses, Gross	$ 10,880	$ 10,400
Accounts Receivable Acquired	4,399
Trade Name Acquired	2,200
Certificate of Need/Licenses Acquired	3,271
Finite-lived Intangible Assets Acquired	6
Other Assets and (Liabilities), Net; Acquired (Assumed)	(984)
Fair Value of Assets Acquired	8,892
Acquired noncontrolling interest	9,398
Goodwill, Acquired During Period, Including Noncontrolling Interest of $4,956	11,386
Goodwill related to noncontrolling interests	$ 4,956