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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
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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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