Segment Information - Additional Information (Detail) - USD ($) $ in Billions |
9 Months Ended | |
---|---|---|
Sep. 30, 2019 |
Dec. 31, 2018 |
|
Segment Reporting [Abstract] | ||
Revenue in excess of billings | $ 0.2 | $ 0.2 |
Total backlog | $ 2.6 | |
Percentage of revenue expected to be recognized over next 12 months | 60.00% | |
Billings and cash collections in excess of revenue | $ 0.9 | $ 0.9 |