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Benefit Plans Benefit Plans (Detail 10) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold |  | $ (2,857) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | $ 36,883 | (26,946) |
Defined Benefit Plan, Fair Value of Plan Assets | 919,782 | 820,272 | $ 844,715
Fair Value, Inputs, Level 3 [Member] |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 21 | 25 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold | 0 |  |
Defined Benefit Plan Sales, Total | 5,809 |  |
Defined Benefit Plan, Purchases, Total | 108 | (21,316) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 300 | (3,830) |
Defined Benefit Plan, Fair Value of Plan Assets | 1,514 | 6,894 | 34,872
Real Asset Mutual Funds, Commodities |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 37,302 | 28,558 |
Real Asset Mutual Funds, Commodities | Fair Value, Inputs, Level 3 [Member] |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold | 0 | (2,857) |
Defined Benefit Plan Sales, Total | 5,711 |  |
Defined Benefit Plan, Purchases, Total | 0 | (21,278) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 117 | (3,776) |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 5,594 | 33,505
Fixed Income Mutual Funds, Insurance Contracts |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 24,935 | 21,255 |
Fixed Income Mutual Funds, Insurance Contracts | Fair Value, Inputs, Level 3 [Member] |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 21 | 25 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold | 0 | 0 |
Defined Benefit Plan Sales, Total | 98 |  |
Defined Benefit Plan, Purchases, Total | 108 | (38) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 183 | (54) |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,514 | $ 1,300 | $ 1,367

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + 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 (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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 (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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