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Restructuring and Cost Reduction Plan - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 4,010 | $ 4,010 |
Restructuring and cost reduction plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Percentage of corporate workforce eliminated due to restructuring | 12.00% |  |
Restructuring charges | $ 4,000 |  |
Restructuring and cost reduction plan | Scenario, Forecast |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected future expense savings |  |  | $ 9,000

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