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Related Party Transactions (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Receipts, Net $ 10,850,000 $ 18,800,000
AHMC    
AHMC – Risk pool revenue 11,600,000 19,400,000
HSMSO    
Management fees, net (650,000) (500,000)
Aurion    
Management fees, net $ (100,000) $ (100,000)