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, 2014	Sep. 30, 2013
Consideration
Cash paid for acquisitions, primarily goodwill and intangible assets	$ 73,194	$ 26,920
Fair value of total consideration transferred	73,194
Recognized amounts of identifiable assets acquired and liabilities assumed
Accounts receivable	9,739
Fixed assets	486
Accounts payable	(1,170)
Other assets and (liabilities), net	(2,552)
Total identifiable assets acquired and liabilities assumed	25,917
Noncontrolling interest	98
Goodwill, including noncontrolling interest of $38	47,375
Certificates of need/licenses
Recognized amounts of identifiable assets acquired and liabilities assumed
Certificates of need/licenses	3,088
Trade name
Recognized amounts of identifiable assets acquired and liabilities assumed
Trade name	15,878
Other identifiable intangible assets
Recognized amounts of identifiable assets acquired and liabilities assumed
Other identifiable intangible assets	$ 448