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Cost-Reduction Actions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 2,600,000 |  | $ 5,200,000 | $ 0
Charges related to work-force reductions | 1,800,000 |  | 900,000 |
Expense (benefit) for changes in estimates |  | $ 700,000 |  | (2,200,000)
Cost of revenue | Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | (1,000,000) | (500,000) | (4,700,000) | (3,500,000)
Selling, general and administrative expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 3,600,000 | $ 1,200,000 | 8,600,000 | $ 1,300,000
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 | $ 800,000 |  | $ 4,300,000 |

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