Summary of Activity Related to Other Intangible Assets Net (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Goodwill and Other Assets Disclosure [Line Items]
Beginning Balance	$ 50,067,000		$ 53,400,000		$ 57,600,000
Additions	4,000,000		10,300,000		3,300,000
Write-off			(1,100,000)		(2,200,000)
Amortization	(2,800,000)		(3,500,000)		(5,300,000)
Impairment	(4,200,000)		(9,100,000)
Ending Balance	47,050,000		50,067,000		53,400,000
Non-Compete Agreements & Reacquired Franchise Rights
Goodwill and Other Assets Disclosure [Line Items]
Beginning Balance	4,200,000	[1]	7,000,000	[1]	9,500,000	[1]
Additions	400,000	[1]	500,000	[1]	2,700,000	[1]
Amortization	(2,800,000)	[1]	(3,300,000)	[1]	(5,200,000)	[1]
Ending Balance	1,800,000	[1]	4,200,000	[1]	7,000,000	[1]
Certificates of Need and Licenses
Goodwill and Other Assets Disclosure [Line Items]
Beginning Balance	34,000,000		41,700,000		43,400,000
Additions	3,600,000		2,500,000		500,000
Write-off			(1,100,000)		(2,200,000)
Impairment	(3,900,000)		(9,100,000)
Ending Balance	33,700,000		34,000,000		41,700,000
Acquired Names of Business
Goodwill and Other Assets Disclosure [Line Items]
Beginning Balance	11,800,000	[2]	4,700,000	[2]	4,700,000	[2]
Additions			7,300,000	[2]	100,000	[2]
Amortization			(200,000)	[2]	(100,000)	[2]
Impairment	(300,000)	[2]
Ending Balance	$ 11,500,000	[2]	$ 11,800,000	[2]	$ 4,700,000	[2]

[1] The weighted-average amortization period of our non-compete agreements and reacquired franchise rights is 1.3 and 0.6 years, respectively.

[2] Acquired Names of Business includes $11.4 million of unamortized acquired names and $0.1 million of amortized acquired names which have a weighted-average amortization period of 1.2 years.