Goodwill and Intangibles- Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 97,049	$ 90,569
Definite-lived assets, gross carrying amount	14,973	14,332
Intangible assets, gross carrying amount	112,022	104,901
Definite-lived assets, accumulated amortization	(10,342)	(8,496)
Definite-lived assets, net carrying amount	4,631	5,836
Intangible assets, net carrying amount	101,680	96,405
Certificates of need/licenses
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	33,179	29,807
Trade names
Finite And Infinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	63,870	60,762
Definite-lived assets, gross carrying amount	9,296	8,985
Definite-lived assets, accumulated amortization	(5,588)	(4,385)
Definite-lived assets, net carrying amount	$ 3,708	$ 4,600
Trade names | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	1 year	2 months
Trade names | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	10 years	5 years
Non-compete agreements
Finite And Infinite Lived Intangible Assets [Line Items]
Definite-lived assets, gross carrying amount	$ 5,677	$ 5,347
Definite-lived assets, accumulated amortization	(4,754)	(4,111)
Definite-lived assets, net carrying amount	$ 923	$ 1,236
Non-compete agreements | Minimum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	5 months	3 months
Non-compete agreements | Maximum
Finite And Infinite Lived Intangible Assets [Line Items]
Estimated useful life	3 years	2 years