Goodwill and Intangibles- Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 75,592	$ 73,790
Definite-lived assets, gross carrying amount	13,103	12,455
Intangible assets, gross carrying amount	88,695	86,245
Definite-lived assets, accumulated amortization	(7,964)	(6,560)
Intangible assets, accumulated amortization ending balance	(7,964)	(6,560)
Definite-lived assets, net carrying amount	5,139	5,895
Intangible assets, net carrying amount	80,731	79,685
Certificates of need/licenses
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	20,349	19,058
Trade names
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	55,243	54,732
Definite-lived assets, gross carrying amount	8,645	8,230
Definite-lived assets, accumulated amortization	(4,002)	(2,797)
Definite-lived assets, net carrying amount	$ 4,643	$ 5,433
Trade names | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Remaining useful life	2 years	3 months
Trade names | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Remaining useful life	5 years	5 years
Non-compete agreements
Finite And Infinite Lived Intangible Assets [Line Items]
Definite-lived assets, gross carrying amount	$ 4,458	$ 4,225
Definite-lived assets, accumulated amortization	(3,962)	(3,763)
Definite-lived assets, net carrying amount	$ 496	$ 462
Non-compete agreements | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Remaining useful life	7 months	3 months
Non-compete agreements | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Remaining useful life	3 years	2 years