Goodwill and Intangibles- Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 95,273	$ 90,569
Definite-lived assets, gross carrying amount	14,687	14,332
Intangible assets, gross carrying amount	109,960	104,901
Definite-lived assets, accumulated amortization	(9,097)	(8,496)
Definite-lived assets, net carrying amount	5,590	5,836
Intangible assets, net carrying amount	100,863	96,405
Certificates of need/licenses
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	32,031	29,807
Trade names
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	63,242	60,762
Definite-lived assets, gross carrying amount	9,127	8,985
Definite-lived assets, accumulated amortization	(4,781)	(4,385)
Definite-lived assets, net carrying amount	$ 4,346	$ 4,600
Trade names | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	2 years	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	$ 5,560	$ 5,347
Definite-lived assets, accumulated amortization	(4,316)	(4,111)
Definite-lived assets, net carrying amount	$ 1,244	$ 1,236
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