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Restructuring (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charge | $ 4,889 |  | $ 26,547 | $ 26,547
Severance charge |  |  | 15,395 |
Property, Plant and Equipment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charge |  |  | 908 |
Non-cash Charge |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charge |  |  | $ 11,152 |
Office Premises and Employee Severance Charge |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charge |  | $ 21,658 |  |
Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charge | $ 4,889 |  |  |

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