Goodwill and Intangibles- Summary of Changes in Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 74,176	$ 73,790
Definite-lived assets, gross carrying amount	12,452	12,455
Intangible assets, gross carrying amount	86,628	86,245
Definite-lived assets, accumulated amortization	(7,124)	(6,560)
Intangible assets, accumulated amortization ending balance	(7,124)	(6,560)
Definite-lived assets, net carrying amount	5,328	5,895
Intangible assets, net carrying amount	79,504	79,685
Certificates of need/licenses
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	19,321	19,058
Trade names
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	54,855	54,732
Definite-lived assets, gross carrying amount	8,228	8,230
Definite-lived assets, accumulated amortization	(3,276)	(2,797)
Definite-lived assets, net carrying amount	4,952	5,433
Trade names | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	2 months	2 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	4,224	4,225
Definite-lived assets, accumulated amortization	(3,848)	(3,763)
Definite-lived assets, net carrying amount	$ 376	$ 462
Non-compete agreements | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	4 months	3 months
Non-compete agreements | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	3 years	3 years