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Contract Balances - Additional Information (Detail1)
$ in Millions
Dec. 31, 2018
USD ($)
Contract With Customer Asset And Liability [Line Items]  
Revenue, Remaining performance obligation $ 183.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Contract With Customer Asset And Liability [Line Items]  
Revenue, Remaining performance obligation $ 176.5
Revenue, Remaining performance obligations, Expected timing of satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Contract With Customer Asset And Liability [Line Items]  
Revenue, Remaining performance obligation $ 6.5
Revenue, Remaining performance obligations, Expected timing of satisfaction, Period