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Restructuring - Summary of Restructuring Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance, beginning of period |  |  | $ 2,547 |
Additions, charged to restructuring expenses | $ 8,664 | $ 5,818 | 11,809 | $ 12,898
Cash payments |  |  | (5,527) |
Non-cash utilization |  |  | (2,037) |
Reclassification to lease liability |  |  | (193) |
Balance, end of period | 6,599 |  | 6,599 |
Employee Separation Costs |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance, beginning of period |  |  | 2,079 |
Additions, charged to restructuring expenses |  | $ 3,303 | 8,177 | $ 5,040
Cash payments |  |  | (4,069) |
Balance, end of period | 6,187 |  | 6,187 |
Accelerated Depreciation and Impairment |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Additions, charged to restructuring expenses |  |  | 2,037 |
Non-cash utilization |  |  | (2,037) |
Other Restructuring |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance, beginning of period |  |  | 468 |
Additions, charged to restructuring expenses |  |  | 1,595 |
Cash payments |  |  | (1,458) |
Reclassification to lease liability |  |  | (193) |
Balance, end of period | $ 412 |  | $ 412 |

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