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Debt - Additional Information (Detail) - USD ($)
Apr. 10, 2019
Jun. 30, 2019
Debt Instrument [Line Items]    
Debt issued by subsidiaries   $ 0
Guarantees of company debt   $ 0
Senior Unsecured Notes Due in 2026 [Member] | MetLife Investment Advisors LLC and Certain of Its Affiliates [Member]    
Debt Instrument [Line Items]    
Senior notes, face amount $ 100,000,000  
Debt instrument, interest rate 3.93%  
Debt instrument, frequency of periodic payment quarterly  
Maturity date of debt instruments Oct. 10, 2026  
Aggregate maximum borrowing capacity $ 200,000,000