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Summary of Significant Accounting Policies - Schedule of Net Patient Service Revenue by Specialties and Subspecialties (Detail) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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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 | 56.00% | 60.00% | 65.00%
Anesthesia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net patient service revenue in percentage | 27.00% | 21.00% | 16.00%
Maternal-Fetal [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net patient service revenue in percentage | 12.00% | 13.00% | 13.00%
Pediatric Cardiology [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net patient service revenue in percentage | 5.00% | 6.00% | 6.00%

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- Definition The percentage of net product revenue to total net revenue from the sale of goods as of year end. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration