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Summary of Significant Accounting Policies - Schedule of Net Revenue by Service Line (Detail) - Product Concentration Risk [Member] - Sales Revenue, Services, Net [Member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 100.00% | 100.00% | 100.00%
Neonatology and Other Pediatric Subspecialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 36.00% | 37.00% | 39.00%
Anesthesiology [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 35.00% | 38.00% | 39.00%
Radiology And Teleradiology [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 12.00% | 8.00% | 6.00%
Maternal-Fetal Medicine [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 8.00% | 8.00% | 8.00%
Management Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 6.00% | 6.00% | 5.00%
Pediatric Cardiology [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 3.00% | 3.00% | 3.00%

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