Annual report pursuant to Section 13 and 15(d)

Operating Leases - Additional Information (Detail)

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Operating Leases - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Leases [Abstract]        
Operating lease right-of-use assets       $ 111.1
Operating lease right-of-use assets, accumulated amortization       $ 20.6
ROU assets and operating lease liabilities in connection with adoption of new lease standard $ 76.7      
Reclassification of prepaid rent and deferred rent to ROU assets in connection with adoption of new lease standard $ 7.8      
Deferred rent   $ 5.6    
Rental expense   $ 27.7 $ 25.6