Goodwill and Intangibles- Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 74,114	$ 73,790
Definite-lived assets, gross carrying amount	12,451	12,455
Intangible assets, gross carrying amount	86,565	86,245
Definite-lived assets, accumulated amortization	(7,538)	(6,560)
Intangible assets, accumulated amortization ending balance	(7,538)	(6,560)
Definite-lived assets, net carrying amount	4,913	5,895
Intangible assets, net carrying amount	79,027	79,685
Certificates of need/licenses
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	19,259	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	8,227	8,230
Definite-lived assets, accumulated amortization	(3,633)	(2,797)
Definite-lived assets, net carrying amount	$ 4,594	$ 5,433
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	$ 4,224	$ 4,225
Definite-lived assets, accumulated amortization	(3,905)	(3,763)
Definite-lived assets, net carrying amount	$ 319	$ 462
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	3 years