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Leases - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lessee Lease Description [Line Items]    
Operating lease cost $ 12.7 $ 38.4
Variable lease cost $ 2.0 $ 6.0
Minimum [Member]    
Lessee Lease Description [Line Items]    
Lease term remaining   1 year
Maximum [Member]    
Lessee Lease Description [Line Items]    
Lease term remaining   36 years