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Adoption of ASC 606 - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, description contracts have an original expected duration of one year or less, for our contracts with a duration greater than one year, the average remaining expected duration was approximately 14 months  
Average revenue remaining performance obligation expected timing of satisfaction period 14 months  
Contract liabilities $ 7.0 $ 8.3
Contract with customer, liability partially offset revenue recognized $ 3.1  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Variable consideration transaction price constraint, period. 1 month