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Restructuring and Other Charges - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (Note 2) | $ 13,247 | $ 17,632 | $ 5,694
Restructuring Reserve, Accrual Adjustment | (600) | (300) | (1,600)
International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Accrual Adjustment | (300) | (100) | (600)
Americas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Accrual Adjustment | (300) | (200) | (500)
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Accrual Adjustment | $ 0 | $ 0 | $ (500)
Staff Reductions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in headcount | 45 | 155 | 179
Staff Reductions | International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (Note 2) | $ 5,600 | $ 4,900 | $ 5,300
Reduction in headcount | 34 | 65 | 75
Staff Reductions | Americas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (Note 2) | $ 2,300 | $ 13,000 | $ 1,800
Reduction in headcount | 8 | 90 | 103
Staff Reductions | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (Note 2) | $ 5,300 |  | $ 200
Reduction in headcount | 3 |  |
Voluntary Retirement Incentive Package [Member] | Special Termination Benefits [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance Costs |  | $ 11,400 |

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