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Restructuring and Other Charges - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 17,632 | $ 5,694 | $ 12,258
Restructuring Reserve, Accrual Adjustment | $ (300) | (1,600) |
Number of employees who accepted the VRIP | 83 |  |
International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Accrual Adjustment | $ (100) | (600) |
Americas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Accrual Adjustment | (200) | (500) |
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Accrual Adjustment | 0 | $ (500) |
Special termination benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Non-cash special termination benefit expense | $ 11,400 |  |
Staff Reductions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in headcount | 155 | 179 | 216
Staff Reductions | International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 4,900 | $ 5,300 | $ 7,400
Reduction in headcount | 65 | 75 | 134
Staff Reductions | Americas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 13,000 | $ 1,800 | $ 3,300
Reduction in headcount | 90 | 103 | 70
Staff Reductions | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | $ 200 | $ 1,600
Reduction in headcount |  | 1 | 12

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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