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Borrowings - Additional Information (Detail)
€ in Millions, $ in Billions
6 Months Ended
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity | € € 600    
Line of credit expiration date Apr. 10, 2029    
Fair value of the CLO assets | $   $ 7.3 $ 7.1
Debt Instrument, Interest Rate, Stated Percentage 1.50% 1.50%