Summary of Activity Related to Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets [Line Items]
Beginning balance	$ 33,193	$ 36,700	$ 47,000
Additions	11,100	0	600
Write-off	(300)	(200)	(1,100)
Other intangibles impairment charge	0	(3,100)	(8,200)
Amortization	0	(200)	(1,600)
Ending balance	44,047	33,193	36,700
NonCompete Agreements Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	0	200	1,800
Additions	5,900	0	0
Write-off	0	0	0
Other intangibles impairment charge	0	0	0
Amortization	0	(200)	(1,600)
Ending balance	5,900	0	200
Certificates Of Need And Licenses [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	23,100	25,400	33,700
Additions	1,100	0	600
Write-off	(300)	(200)	(1,100)
Other intangibles impairment charge	0	(2,100)	(7,800)
Amortization	0	0	0
Ending balance	23,900	23,100	25,400
Acquired Names Of Business [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	10,100	11,100	11,500
Additions	4,100	0	0
Write-off	0	0	0
Other intangibles impairment charge	0	(1,000)	(400)
Amortization	0	0	0
Ending balance	$ 14,200	$ 10,100	$ 11,100