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Leases (Lessee) - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessee Lease Description [Line Items]      
Lease expenses   $ 9.4 $ 9.8
Sublease rental income   $ 4.3 $ 6.6
Minimum [Member]      
Lessee Lease Description [Line Items]      
Lessee, operating and finance leases remaining lease term 4 years 6 months    
Maximum [Member]      
Lessee Lease Description [Line Items]      
Lessee, operating and finance leases remaining lease term 54 years