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Special Charges - Summary of Activity Related to Liability for Special Charges (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Restructuring Reserve [Roll Forward] |  |
Beginning Balance | $ 11,560 | $ 11,813
Additions | 47,342 | 10,724
Reductions | (29,112) | (11,160)
Foreign currency translation adjustment and other | 146 | 183
Ending Balance | 29,936 | 11,560
Net non-cash expense reversals | 800 | 300
Expected payments to special charges, amount expected to be paid in 2018 | 16,000 |
Expected payments to special charges, amount expected to be paid in 2019 | 4,800 |
Expected payments to special charges, amount expected to be paid in 2020 | 3,800 |
Expected payments to special charges, amount expected to be paid in 2021 | 3,200 |
Expected payments to special charges, amount expected to be paid from 2022 to 2026 | 2,100 |
Employee Severance |  |
Restructuring Reserve [Roll Forward] |  |
Beginning Balance | 8,225 | 7,768
Additions | 23,260 | 10,724
Reductions | (20,771) | (10,264)
Foreign currency translation adjustment and other | 165 | (3)
Ending Balance | 10,879 | 8,225
Lease Termination Costs |  |
Restructuring Reserve [Roll Forward] |  |
Beginning Balance | 3,335 | 4,045
Additions | 23,498 | 0
Reductions | (7,757) | (896)
Foreign currency translation adjustment and other | (19) | 186
Ending Balance | 19,057 | 3,335
Other |  |
Restructuring Reserve [Roll Forward] |  |
Beginning Balance | 0 | 0
Additions | 584 | 0
Reductions | (584) | 0
Foreign currency translation adjustment and other | 0 | 0
Ending Balance | $ 0 | $ 0

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 50 -Paragraph 1 -Subparagraph (b)(2) -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 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + 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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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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