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Movement in Restructuring Provisions incl. Resource Rationalizations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Beginning provision |  |  | $ 12,490 |  |  |  |
Total provision recognized | $ 12,490 | $ 7,753 | 12,490 | $ 7,753 | $ 7,800 |  | $ 8,800
Utilized |  |  | (490) |  |  |  |
Foreign exchange |  |  | 0 |  |  |  |
Closing provision | 12,000 |  | 12,000 |  | 12,490 |  |
Resource Rationalizations |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Beginning provision |  |  | 317 | 1,791 | 1,791 |  |
Total provision recognized |  |  |  |  |  | $ 8,159 |
Utilized |  |  | (310) |  | (1,474) | (6,305) |
Foreign exchange |  |  |  |  |  | (63) |
Closing provision | 7 |  | 7 |  | 317 | 1,791 |
Workforce Reduction |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Beginning provision |  |  | 9,684 |  |  |  |
Utilized |  |  | (490) |  |  |  |
Foreign exchange |  |  | 0 |  |  |  |
Closing provision | 9,194 |  | 9,194 |  | 9,684 |  |
Workforce Reduction | Resource Rationalizations |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Beginning provision |  |  | 0 | 393 | 393 |  |
Total provision recognized |  |  |  |  |  | 6,190 |
Utilized |  |  | 0 |  | (393) | (5,734) |
Foreign exchange |  |  |  |  |  | (63) |
Closing provision | 0 |  | 0 |  | 0 | 393 |
Onerous Lease |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Beginning provision |  |  | 2,806 |  |  |  |
Utilized |  |  | 0 |  |  |  |
Foreign exchange |  |  | 0 |  |  |  |
Closing provision | 2,806 |  | 2,806 |  | 2,806 |  |
Onerous Lease | Resource Rationalizations |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Beginning provision |  |  | 317 | $ 1,398 | 1,398 |  |
Total provision recognized |  |  |  |  |  | 1,969 |
Utilized |  |  | (310) |  | (1,081) | (571) |
Foreign exchange |  |  |  |  |  | 0 |
Closing provision | $ 7 |  | $ 7 |  | $ 317 | $ 1,398 |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: 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 4: 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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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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