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Internal-Use Software - Additional Information (Detail) - Early Adoption ASU 2018-15 [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized internal use software costs and implementation costs net of accumulated amortizations $ 64.8 $ 55.7
Capitalized implementation and internal-use software costs during the period $ 21.9 22.4
Minimum [Member]    
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized implementation and internal-use software costs amortization period 10 years  
Property and Equipment, Net [Member]    
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized internal use software costs and implementation costs net of accumulated amortizations $ 50.4 45.6
Other Assets [Member]    
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized internal use software costs and implementation costs net of accumulated amortizations $ 14.4 $ 10.1