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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to opening retained earnings, net of tax |  |  |  | $ 2,888
Contract liability revenue recognized |  |  | $ 600 | 6,900
Transaction price allocated to uncompleted contracts | $ 83,800 |  | $ 83,800 | $ 83,800
Expected time of revenue recognition | Over the next 18 months |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to opening retained earnings, net of tax |  | $ 2,900 |  |

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