Other Intangible Assets - Other Identifiable Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items]
Intangible assets subject to amortization, Gross Carrying Amount	$ 3,247	$ 3,247
Intangible assets not subject to amortization, Gross Carrying Amount	89,796	88,990
Total	93,043	92,237
Intangible assets subject to amortization, Accumulated Amortization	(3,247)	(3,247)
Intangible assets not subject to amortization, Accumulated Amortization	0	0
Total	(3,247)	(3,247)
Licenses and Accreditations [Member]
Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items]
Intangible assets not subject to amortization, Gross Carrying Amount	12,259	12,343
Intangible assets not subject to amortization, Accumulated Amortization	0	0
Trade Names [Member]
Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items]
Intangible assets not subject to amortization, Gross Carrying Amount	60,572	60,109
Intangible assets not subject to amortization, Accumulated Amortization	0	0
Certificates of Need [Member]
Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items]
Intangible assets not subject to amortization, Gross Carrying Amount	16,965	16,538
Intangible assets not subject to amortization, Accumulated Amortization	0	0
Contract Intangible Assets [Member]
Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items]
Intangible assets subject to amortization, Gross Carrying Amount	2,100	2,100
Intangible assets subject to amortization, Accumulated Amortization	(2,100)	(2,100)
Non-Compete Agreements [Member]
Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items]
Intangible assets subject to amortization, Gross Carrying Amount	1,147	1,147
Intangible assets subject to amortization, Accumulated Amortization	$ (1,147)	$ (1,147)