Acquisitions and Disposals - Schedule of Aggregate Consideration Paid and Recognized Identified Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Consideration
Cash	$ 26,920
Fair value of total consideration transferred	26,920
Recognized amounts of identifiable assets acquired and liabilities assumed
Other assets and (liabilities),net	(321)
Total identifiable assets	1,785
Noncontrolling interest	608
Goodwill, including noncontrolling interest of $622	25,743
Trade Name [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed
Business acquisition, purchase price allocation, Intangible Assets	1,177
Certificate of need/license [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed
Business acquisition, purchase price allocation, Intangible Assets	598
Other identifiable intangible assets [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed
Business acquisition, purchase price allocation, Intangible Assets	$ 331