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Retirement Benefits - Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Investment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Domestic Pension Plans, Funded Percentage | 112.00% | 117.00% |
Number Of Indexed Funds | Investment | 6 |  |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 825,806 |  |
Fair value of plan assets at end of year | 732,502 | $ 825,806 |
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 93,100 | 96,200 |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 95,600 | 101,200 |
Pension Plan [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Obligation at beginning of year | 808,149 | 726,421 |
Service cost | 14,238 | 13,372 | $ 12,895
Interest cost | 25,316 | 25,501 | 25,781
Actuarial (gains) losses | (53,044) | 54,562 |
Acquisition | 0 | 19,225 |
Special termination benefits | 0 | 0 | 2,837
Plan amendments | 0 | 147 |
Benefits paid | (38,335) | (43,598) |
Participant contributions | 0 | 0 |
Foreign currency exchange rate changes | (4,699) | 12,519 |
Obligation at end of year | 751,625 | 808,149 | 726,421
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 825,806 | 759,551 |
Actual return on plan assets | (57,082) | 108,154 |
Employer contributions | 2,113 | 1,699 |
Participant contributions | 0 | 0 |
Benefits paid | (38,335) | (43,598) |
Fair value of plan assets at end of year | 732,502 | 825,806 | 759,551
Funded status | (19,123) | 17,657 |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current assets | 76,443 | 118,892 |
Current liabilities | (2,174) | (2,227) |
Non-current liabilities | (93,392) | (99,008) |
Net amount recognized | (19,123) | 17,657 |
Amounts recognized in accumulated other comprehensive loss (income) |  |  |
Net actuarial loss (gain) | 218,867 | 154,642 |
Prior service cost (credit) | 765 | 938 |
Net amount recognized | 219,632 | 155,580 |
Other Postretirement Benefits Plan [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Obligation at beginning of year | 20,939 | 21,698 |
Service cost | 99 | 104 | 222
Interest cost | 640 | 692 | 891
Actuarial (gains) losses | (2,031) | 630 |
Acquisition | 0 | 0 |
Plan amendments | 1,210 | (2) |
Benefits paid | (1,764) | (2,325) |
Participant contributions | 93 | 142 |
Foreign currency exchange rate changes | 0 | 0 |
Obligation at end of year | 19,186 | 20,939 | 21,698
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 1,671 | 2,183 |
Participant contributions | 93 | 142 |
Benefits paid | (1,764) | (2,325) |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Funded status | (19,186) | (20,939) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (1,924) | (2,083) |
Non-current liabilities | (17,262) | (18,856) |
Net amount recognized | (19,186) | (20,939) |
Amounts recognized in accumulated other comprehensive loss (income) |  |  |
Net actuarial loss (gain) | (7,087) | (5,561) |
Prior service cost (credit) | (8,735) | (11,337) |
Net amount recognized | $ (15,822) | $ (16,898) |

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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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