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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Jan. 01, 2018 | Mar. 31, 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 |  |  | 6,300
Transaction price allocated to uncompleted contracts | $ 78,600 |  | $ 78,600
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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