Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Additional Information (Detail1)

v3.10.0.1
Revenue Recognition - Additional Information (Detail1)
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Contract With Customer Assets And Liabilities [Line Items]  
Revenue remaining performance obligation, expected timing of satisfaction, period
Minimum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Contract With Customer Assets And Liabilities [Line Items]  
Revenue remaining performance obligation percentage 50.00%
Revenue remaining performance obligation, expected timing of satisfaction, period 1 year
Minimum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Contract With Customer Assets And Liabilities [Line Items]  
Revenue remaining performance obligation percentage 10.00%
Revenue remaining performance obligation, expected timing of satisfaction, period 2 years
Maximum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Contract With Customer Assets And Liabilities [Line Items]  
Revenue remaining performance obligation percentage 55.00%
Revenue remaining performance obligation, expected timing of satisfaction, period 1 year
Maximum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Contract With Customer Assets And Liabilities [Line Items]  
Revenue remaining performance obligation percentage 20.00%
Revenue remaining performance obligation, expected timing of satisfaction, period 2 years