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Cost-Reduction Actions - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 200,000 |  | $ 5,400,000 | $ 0
Charges related to work-force reductions | (500,000) |  | 400,000 |
Benefit for changes in estimates |  | $ 900,000 |  | 3,100,000
Cost of revenue | Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | (1,900,000) | 700,000 | (6,600,000) | 4,200,000
Selling, general and administrative expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 2,100,000 | $ 200,000 | 10,700,000 | $ (1,100,000)
Research and development expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 1,300,000 |
Lease abandonment costs and asset write-offs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other expenses related to the cost-reduction effort | $ 700,000 |  | $ 5,000,000.0 |

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