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Restructuring Charges - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) employee | Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ (5,274) | $ (12,739) |
Adjustments to estimates on restructuring reserves | 0 |  | $ (300)
International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | (3,300) | (12,300) |
Adjustments to estimates on restructuring reserves | 0 |  | (100)
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | (2,000) |  |
Adjustments to estimates on restructuring reserves | 0 |  | 0
Americas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | $ (400) |
Adjustments to estimates on restructuring reserves | $ 0 |  | $ (200)
Voluntary Retirement Incentive Package |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees that made the revocable election to retire | employee |  | 83 |
Voluntary Retirement Incentive Package | Special Termination Benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | $ 11,400 |

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