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Pension Plans and Other Postretirement Benefits - Financial Assets Accounted for at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity securities | $ 771 | [1] | $ 25 | [1] |
Total Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 616,545 | [2] | 563,303 | [2] | 531,105
Total Pension Benefits | Domestic Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 167,627 | [3] | 218,145 | [4] |
Total Pension Benefits | International Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 70,609 | [5] | 107,647 | [6] |
Total Pension Benefits | Fixed Income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 248,095 | [7] | 142,967 | [8] |
Total Pension Benefits | Absolute Return |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 125,137 | [9] | 80,714 | [9] |
Total Pension Benefits | Cash |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5,077 |  | 13,830 |  |
Total Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5,620 | [2] | 6,611 | [2] | 7,681
Total Postretirement Benefits | Fixed Income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5,620 | [7] | 6,611 | [8] |
Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity securities | 21 | [1] | 25 | [1] |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 482,002 | [2] | 247,463 | [2] |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits | Domestic Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 167,627 | [3] | 153,465 | [4] |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits | International Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 70,609 | [5] | 18,977 | [6] |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits | Fixed Income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 237,151 | [7] | 51,306 | [8] |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits | Absolute Return |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 1,538 | [9] | 9,885 | [9] |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits | Cash |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5,077 |  | 13,830 |  |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 10,944 | [2] | 245,011 | [2] |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits | Domestic Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 | [3] | 64,680 | [4] |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits | International Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 | [5] | 88,670 | [6] |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits | Fixed Income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 10,944 | [7] | 91,661 | [8] |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits | Cash |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  |  |  |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5,620 | [2] | 6,611 | [2] |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Postretirement Benefits | Fixed Income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5,620 | [7] | 6,611 | [8] |
Unobservable Inputs (Level 3) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity securities | 750 | [1] |  |  |
Unobservable Inputs (Level 3) | Total Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 123,599 | [2] | 70,829 | [2] | 73,025
Unobservable Inputs (Level 3) | Total Pension Benefits | Absolute Return |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | $ 123,599 | [9] | $ 70,829 | [9] |
[1] | Primarily consists of private equity securities classified as available-for-sale and are reported in Investments in the consolidated balance sheets. The changes in fair value are reported in Other in our consolidated statements of comprehensive income. Holdings in private equity securities are typically valued using the net asset valuations provided by the underlying private investment companies and as such are classified within Level 3.
[2] | See Note 17 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets.
[3] | Consists primarily of U.S. stock funds that track or are actively managed and measured against the S&P 500 index
[4] | Consists primarily of U.S. equity securities covering a diverse group of companies and U.S. stock funds that primarily track or are actively managed and measured against indices including the S&P 500 and the Russell 2000.
[5] | Consists primarily of an international equity fund which invests in common stocks and other securities whose value is based on an international equity index or an underlying equity security or basket of equity securities.
[6] | Consists primarily of international equity funds which include stocks and debt obligations of non-U.S. entities that primarily track or are actively managed and measured against various MSCI indices.
[7] | Consists primarily of mutual funds that hold debt obligations issued by governments, corporations, municipalities and other borrowers. Also includes insurance policies.
[8] | Consists primarily of fixed income mutual funds, corporate bonds, U.S. Treasury notes, other government securities and insurance policies.
[9] | Consists primarily of funds with holdings in private investment companies. See additional information about the Absolute Return investments below.

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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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- Definition For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph b -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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