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Benefit Plans Benefit Plans (Detail 7) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Service Cost | $ 16,906 | $ 17,236 | $ 19,501
Defined Benefit Plan, Interest Cost | 12,955 | 15,168 | 20,641
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 37,086 | 40,949 | 46,407
Amortization of Actuarial (Gains) Losses and Plan Amendments | 20,129 | 15,962 | 13,018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 7,963 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 12,904 | 15,380 | 6,753
Pension Plan [Member] | Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Service Cost | 565 | 432 | 837
Defined Benefit Plan, Interest Cost | 4,374 | 4,428 | 6,431
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 6,737 | 7,781 | 9,575
Amortization of Actuarial (Gains) Losses and Plan Amendments | 6,556 | 7,606 | 7,626
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 7,963 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 4,758 | 12,648 | 5,319
Pension Plan [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Service Cost | 16,341 | 16,804 | 18,664
Defined Benefit Plan, Interest Cost | 8,511 | 10,664 | 14,071
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 30,349 | 33,168 | 36,832
Amortization of Actuarial (Gains) Losses and Plan Amendments | 16,247 | 12,923 | 10,639
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 10,750 | 7,223 | 6,542
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Service Cost | 0 | 0 | 0
Defined Benefit Plan, Interest Cost | 70 | 76 | 139
Amortization of Actuarial (Gains) Losses and Plan Amendments | (2,674) | (4,567) | (5,247)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (2,604) | $ (4,491) | $ (5,108)

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- Definition Amortization of actuarial (gains) losses and plan amendments and prior service cost recorded to net periodic pension cost from other comprehensive income during the period, gross. + References No definition available. + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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