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Internal-Use Software - Additional Information (Detail) - Early Adoption ASU 2018-15 [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized implementation costs net of amortizations, for software services $ 12.0 $ 10.6
Capitalized implementation costs during the period $ 1.6  
Minimum [Member]    
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized implementation costs amortization period 3 years  
Maximum [Member]    
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]    
Capitalized implementation costs amortization period 10 years