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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

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