Annual report pursuant to Section 13 and 15(d)

Property, Equipment and Software - Additional Information (Detail)

v3.10.0.1
Property, Equipment and Software - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense for property, equipment and software $ 28.5 $ 27.2 $ 24.5
Carrying amount of capitalized development costs 54.9 45.5  
Software      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense for property, equipment and software $ 11.9 $ 8.0 $ 5.8