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Schedule of Pension Plans' Assets Fair Value Measured on A Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | $ 238,359 | $ 185,122
Short-term Investments |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 394 | 1,257
Equity Securities | United States Large Value |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 15,021 | 11,272
Equity Securities | United States Large Growth |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 12,029 | 9,172
Equity Securities | United States Mid Cap Value |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 2,481 | 1,914
Equity Securities | United States Mid Cap Growth |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 4,734 | 3,684
Equity Securities | United States Small Blend |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 5,033 | 3,784
Equity Securities | Foreign Large Blend |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 39,204 | 27,164
Equity Securities | Diversified Emerging Markets |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 7,722 | 5,306
Equity Securities | Real Estate |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 6,881 | 5,405
Debt Securities | Municipal Bonds |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 29,644 | 24,372
Debt Securities | Corporate Bond Securities |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 115,216 | 91,792
Quoted prices in active markets for identical assets (Level 1) |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 136,771 | 100,846
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | United States Large Value |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 15,021 | 11,272
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | United States Large Growth |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 12,029 | 9,172
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | United States Mid Cap Value |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 2,481 | 1,914
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | United States Mid Cap Growth |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 4,734 | 3,684
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | Foreign Large Blend |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 39,204 | 27,164
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | Diversified Emerging Markets |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 7,722 | 5,306
Quoted prices in active markets for identical assets (Level 1) | Equity Securities | Real Estate |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 6,881 | 5,405
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | Corporate Bond Securities |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 48,699 | 36,929
Other observable inputs (Level 2) |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 101,588 | 84,276
Other observable inputs (Level 2) | Short-term Investments |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 394 | 1,257
Other observable inputs (Level 2) | Equity Securities | United States Small Blend |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 5,033 | 3,784
Other observable inputs (Level 2) | Debt Securities | Municipal Bonds |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | 29,644 | 24,372
Other observable inputs (Level 2) | Debt Securities | Corporate Bond Securities |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Total fair value of pension plans' assets | $ 66,517 | $ 54,863

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: 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. Reference 3: 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 4: 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 5: 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 + Details
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