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Pension Plans and Other Postretirement Benefits - Changes in Fair Value of Plans Level 3 Assets (Detail) (Total Pension Benefits, USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Unobservable Inputs (Level 3) | Dec. 31, 2012 Unobservable Inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning balance | $ 616,545 | [1] | $ 563,303 | [1] | $ 531,105 | $ 70,829 | [1] | $ 73,025 |
Total losses relating to assets sold during the period |  |  |  |  |  | (994) | [2] | (31) | [3]
Total unrealized gains relating to assets still held at the reporting date |  |  |  |  |  | (4,511) | [2] | (2,311) |
Purchases |  |  |  |  |  | 76,643 |  |  |
Sales |  |  |  |  |  | (20,356) |  | (4,476) |
Fair value of plan assets, Ending Balance | $ 616,545 | [1] | $ 563,303 | [1] | $ 531,105 | $ 123,599 | [1] | $ 70,829 | [1]
[1] | See Note 17 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets.
[2] | Consists primarily of funds with holdings in private investment companies. See additional information about the Absolute Return investments below.
[3] | These gains (losses) are recognized in the consolidated balance sheets and are included as changes in plan assets in the tables above.

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- Definition Defined Benefit Plan, Sales, Plan Assets + References No definition available. + Details
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- Definition Unrealized gains / losses on plan assets separately identifying the amount related to assets still held at the reporting date. + References No definition available. + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=21915506&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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