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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
	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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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