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Postretirement Benefit Plans - Information for Pension Plans with Projected Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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United States [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Projected benefit obligation | $ 160,789 | $ 169,407
Accumulated benefit obligation | 160,789 | 169,407
Fair value of plan assets | $ 121,835 | 126,369
United Kingdom [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Projected benefit obligation |  | 22,983
Accumulated benefit obligation |  | 22,983
Fair value of plan assets |  | $ 22,858

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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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