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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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&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 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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