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Percentage of Net Revenue and Total Accounts Receivable (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Sales Revenue, Net          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage     10.00%    
Sales Revenue, Net | Governmental - Medicare/Medi-Cal          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage 19.20% 30.00% 21.40% 32.00%  
Sales Revenue, Net | L.A Care          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage 12.90% 17.00% 12.30% 16.00%  
Sales Revenue, Net | Allied Physicians [Member]          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage [1] [1] 9.50% [1]  
Sales Revenue, Net | Health Net          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage [1] 10.00% [1] 11.00%  
Accounts Receivable | Governmental - Medicare/Medi-Cal          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage     19.10%   39.30%
Accounts Receivable | Allied Physicians [Member]          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage     9.20%   15.80%
[1] Represents less than 10%