Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail)

v3.19.3
Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Restricted cash $ 173.7 $ 104.5