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Goodwill and Intangible Assets - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 910,888	$ 906,681
Accumulated Amortization	(322,576)	(266,753)
Net Carrying Value	588,312	639,928
Physician And Hospital Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	376,871	381,635
Accumulated Amortization	(223,589)	(203,915)
Net Carrying Value	153,282	177,720
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	443,300	443,300
Accumulated Amortization	(71,870)	(48,837)
Net Carrying Value	371,430	394,463
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	43,156	43,156
Accumulated Amortization	(4,630)	(2,933)
Net Carrying Value	38,526	40,223
Patented and Other Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	47,561	38,590
Accumulated Amortization	(22,487)	(11,068)
Net Carrying Value	$ 25,074	$ 27,522

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Name Accounting Standards Codification
-Topic 350
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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