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Summary of Significant Accounting Policies - Schedule of Net Patient Service Revenue by Specialties and Subspecialties (Detail) (Sales [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net patient service revenue in percentage	100.00%	100.00%	100.00%
Neonatal and Other Pediatric Subspecialties [Member]
Segment Reporting Information [Line Items]
Net patient service revenue in percentage	52.00%	56.00%	60.00%
Anesthesia [Member]
Segment Reporting Information [Line Items]
Net patient service revenue in percentage	32.00%	27.00%	21.00%
Maternal-Fetal [Member]
Segment Reporting Information [Line Items]
Net patient service revenue in percentage	11.00%	12.00%	13.00%
Pediatric Cardiology [Member]
Segment Reporting Information [Line Items]
Net patient service revenue in percentage	5.00%	5.00%	6.00%

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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