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Percentage of Net Revenue and Total Accounts Receivable (Detail)
3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Sales Revenue, Net | Medicare/Medi-Cal    
Accounts Receivable And Net Revenue [Line Items]    
Concentration Risk, Percentage 31.10% 14.00%
Sales Revenue, Net | L.A Care    
Accounts Receivable And Net Revenue [Line Items]    
Concentration Risk, Percentage 13.90% 15.00%
Sales Revenue, Net | Healthnet    
Accounts Receivable And Net Revenue [Line Items]    
Concentration Risk, Percentage 12.40% 15.20%
Accounts Receivable | Medicare/Medi-Cal    
Accounts Receivable And Net Revenue [Line Items]    
Concentration Risk, Percentage 25.10% 21.40%