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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Contractual commitment to outsource information technology operations, notice period 180 days  
Remaining annual obligations in 2020 $ 28.9  
Remaining annual obligations in 2021 25.4  
Contractual obligation, due in 2020 2.3  
Contractual obligation, due in 2021 2.3  
Contractual obligation, due in 2022 2.3  
Contractual obligation, due in 2023 2.3  
Contractual obligation, due in 2024 $ 2.1  
Rent expense for operating leases   $ 56.1