Goodwill and Intangibles- Summary of Changes in Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 73,503	$ 57,247
Definite-lived assets, gross carrying amount	12,505	9,455
Intangible assets, gross carrying amount	86,008	66,702
Definite-lived assets, accumulated amortization	(6,020)	(4,518)
Intangible assets, accumulated amortization ending balance	(6,020)	(4,518)
Definite-lived assets, net carrying amount	6,485	4,937
Intangible assets, net carrying amount	79,988	62,184
Certificates of need/licenses
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	13,610	10,540
Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	2 years
Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Trade names
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	59,893	46,707
Definite-lived assets, gross carrying amount	8,214	5,625
Definite-lived assets, accumulated amortization	(2,313)	(1,055)
Definite-lived assets, net carrying amount	5,901	4,570
Trade names | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	2 months	3 months
Trade names | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	5 years	5 years
Non-compete agreements
Finite And Infinite Lived Intangible Assets [Line Items]
Definite-lived assets, gross carrying amount	4,269	3,830
Definite-lived assets, accumulated amortization	(3,707)	(3,463)
Definite-lived assets, net carrying amount	562	367
Non-compete agreements | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	1 month	3 months
Non-compete agreements | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	3 years	2 years
Favorable leases
Finite And Infinite Lived Intangible Assets [Line Items]
Definite-lived assets, gross carrying amount	22
Definite-lived assets, net carrying amount	$ 22
Favorable leases | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	9 months
Favorable leases | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	3 years