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Lease Agreements - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Base rent $ 188.6 $ 185.7  
Base rent (including straight-line rent)     $ 184.7
Expense recoveries 34.7 36.5 35.5
Payments for rent $ 0.9 $ 0.9  
Percentage rent     $ 1.0