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Goodwill and Intangible Assets - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 595,107 | $ 584,993
Accumulated Amortization | (320,700) | (271,828)
Net Carrying Value | 274,407 | 313,165
Physician And Hospital Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 384,059 | 375,344
Accumulated Amortization | (269,889) | (222,818)
Net Carrying Value | 114,170 | 152,526
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 156,530 | 156,530
Accumulated Amortization | (29,595) | (29,595)
Net Carrying Value | 126,935 | 126,935
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 19,990 | 19,990
Accumulated Amortization | (2,326) | (2,326)
Net Carrying Value | 17,664 | 17,664
Patented and Other Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 34,528 | 33,129
Accumulated Amortization | (18,890) | (17,089)
Net Carrying Value | $ 15,638 | $ 16,040

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