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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment as an increase to opening retained earnings, net of tax |  |  |  | $ 2,142
Contract liability revenue recognized |  |  |  | 7,000
Transaction price allocated to uncompleted contracts | $ 88,000 |  |  | $ 88,000
Expected time of revenue recognition | Over the next 18 months. |  |  |
Performance obligation, description of timing |  |  |  | One year or less.
Accounting Standards Update 2014-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment as an increase to opening retained earnings, net of tax |  | $ 2,100 | $ (800) |
Increase (decrease) in current assets |  | 2,800 | (1,000) |
Increase (decrease) in deferred income taxes |  | $ 700 | $ (200) |

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