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Business Acquisitions - Additional Information (Detail) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 USD ($) Company | Dec. 31, 2017 Company
Business Acquisition [Line Items] |  |  |
Number of physician group practices acquired | Company |  | 9 | 10
Number of neonatology practices acquired | Company |  | 2 | 1
Number of other pediatric subspecialty practices acquired | Company |  | 2 | 2
Number of radiology practices acquired | Company |  | 5 | 4
Total business acquisition consideration |  | $ 111.8 |
Contingent consideration payments related to prior-period acquisitions |  | 6.4 |
Purchase consideration payments related to prior-period acquisitions |  | 1.2 |
Change in the fair value of a contingent consideration |  | (5.3) |
Assets held for sale |  | $ 46.0 |
Sale of equity method investments |  | 49.00% |
Number of maternal-fetal medicine practices acquired | Company |  |  | 2
Number of pediatric multi-specialty practice acquired | Company |  |  | 1
Sale of minority interest percentage | 75.00% |  |
Deconsolidation percentage | 100.00% |  |
Physician Group [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 95.0 |
Other intangible assets |  | 17.2 |
Decrease in current assets |  | 1.7 |
Other liabilities |  | 2.1 |
Prior-Period Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Decrease in current assets |  | 1.2 |
Decrease in noncurrent assets |  | 1.5 |
Decrease in noncurrent liabilities |  | 0.2 |
Net increase in goodwill resulting from finalization of tax acquisition accounting |  | 4.0 |
Additional cash consideration related to a working capital true up |  | $ 1.5 |

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