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Adoption of ASC 606 - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jun. 30, 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 | $ 5.6 | $ 5.6 | $ 6.1 | $ 7.0
Contract with customer, liability partially offset revenue recognized | $ 0.8 | $ 4.1 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Revenue used to determine transaction price, period | 1 month | 1 month |  |

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