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Investments - Additional Information (Detail) - ENeura Restructured Debt Security [Member]
$ in Millions
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Original effective interest rate of debt security 8.00%
Restructured Note, amortized cost $ 14.7
Estimated fair value of debt securities 15.6
Unpaid principal balance of debt securities $ 15.0