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Summary of Significant Accounting Policies and Basis of Presentation (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) ReportingUnit | Dec. 31, 2017 USD ($)
Basis Of Presentation And Accounting Policies [Line Items] |  |  |
Number of reporting units having impairment indicators | ReportingUnit |  | 2 |
Goodwill impairment | $ 6,151 | $ 6,151 |
Other intangible assets impairment | 3,135 | 3,135 |
Accounts receivable, net of allowance for doubtful accounts | 183,476 | 183,476 | $ 185,058
Aggregate amount of transaction price allocated to material rights that remain unsatisfied | 1,914 | $ 1,914 |
Revenue expected to be recognized in next 3 months |  | 17.00% |
Revenue expected to be recognized in 2019 |  | 54.00% |
Revenue expected to be recognized in 2020 |  | 16.00% |
Revenue expected to be recognized in 2021 |  | 8.00% |
Revenue expected to be recognized in 2022 |  | 3.00% |
Revenue expected to be recognized in 2023 |  | 2.00% |
Unearned revenue | 6,128 | $ 6,128 | 4,889
Minimum |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |
Payment terms of contracts |  | 30 days |
Maximum |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |
Payment terms of contracts |  | 120 days |
Industrial Segments |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |
Unearned revenue | $ 4,214 | $ 4,214 | $ 4,889

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