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Leases - Additional Information (Detail) $ in Millions	12 Months Ended
Leases - Additional Information (Detail) $ in Millions	Dec. 31, 2019 USD ($)
Lease And Rental Expense [Line Items]
Right-of-use asset	$ 41.4
Lease liability	42.0
Expected annual subleases income	0.6
ASU No. 2016-02 [Member]
Lease And Rental Expense [Line Items]
Estimated ROU assets and lease liabilities	$ 10.7