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Percentage of Net Revenue and Total Accounts Receivable (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Governmental - Medicare/Medi-Cal          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage 30.00% 55.00% 32.00% 63.00%  
L.A Care          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage 17.00% [1] 16.00% [1]  
Healthnet          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage 10.00% [1] 11.00% [1]  
Accounts Receivable | Governmental - Medicare/Medi-Cal          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage     34.00%   22.00%
[1] Not a payor during this time period