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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 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 |  |  | $ 100 | 7,000
Transaction price allocated to uncompleted contracts | $ 87,100 |  | 87,100 | $ 87,100
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 other current assets |  | 2,800 | (1,000) |
Increase (decrease) in deferred income taxes |  | $ 700 | $ (200) |

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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