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Goodwill and Intangible Assets - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 906,681 | $ 871,821
Accumulated Amortization | (266,753) | (203,292)
Net Carrying Value | 639,928 | 668,529
Physician And Hospital Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 381,635 | 347,862
Accumulated Amortization | (203,915) | (168,488)
Net Carrying Value | 177,720 | 179,374
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 443,300 | 443,300
Accumulated Amortization | (48,837) | (27,368)
Net Carrying Value | 394,463 | 415,932
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 43,156 | 43,156
Accumulated Amortization | (2,933) | (1,604)
Net Carrying Value | 40,223 | 41,552
Patented and Other Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 38,590 | 37,503
Accumulated Amortization | (11,068) | (5,832)
Net Carrying Value | $ 27,522 | $ 31,671

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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