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Plan Assets Using Fair Value Methodologies (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 575,177 | $ 419,771
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 27,473 | 13,084
Fixed income | Foreign Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 164,255 | 76,196
Fixed income | US Treasury Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 69,375 | 82,989
Fixed income | Collateralized Mortgage Backed Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 23,382 | 40,915
Fixed income | Other securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 28,111 | 8,177
Equity securities | U S Small Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 7,094
Equity securities | U S Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,726 | 7,532
Equity securities | U S Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 88,985 | 47,398
Equity securities | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 89,768 | 39,594
Equity securities | US Long/Short Equity Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 47,597 | 56,575
Equity securities | Common Stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 16,645
Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 29,505 | 23,572
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,238 | 51,209
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,238 |
Fair Value, Inputs, Level 1 | Equity securities | U S Small Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 7,094
Fair Value, Inputs, Level 1 | Equity securities | U S Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 7,528
Fair Value, Inputs, Level 1 | Equity securities | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 19,942
Fair Value, Inputs, Level 1 | Equity securities | Common Stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 16,645
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 550,649 | 348,555
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21,235 | 13,084
Fair Value, Inputs, Level 2 | Fixed income | Foreign Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 164,255 | 76,046
Fair Value, Inputs, Level 2 | Fixed income | US Treasury Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 69,375 | 82,989
Fair Value, Inputs, Level 2 | Fixed income | Collateralized Mortgage Backed Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 23,382 | 40,286
Fair Value, Inputs, Level 2 | Fixed income | Other securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 28,111 | 7,958
Fair Value, Inputs, Level 2 | Equity securities | U S Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,726 | 4
Fair Value, Inputs, Level 2 | Equity securities | U S Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 88,985 | 47,398
Fair Value, Inputs, Level 2 | Equity securities | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 89,768 | 19,652
Fair Value, Inputs, Level 2 | Equity securities | US Long/Short Equity Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 47,597 | 56,575
Fair Value, Inputs, Level 2 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11,215 | 4,563
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 18,290 | 20,007
Fair Value, Inputs, Level 3 | Fixed income | Foreign Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 150
Fair Value, Inputs, Level 3 | Fixed income | Collateralized Mortgage Backed Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 629
Fair Value, Inputs, Level 3 | Fixed income | Other securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 219
Fair Value, Inputs, Level 3 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 18,290 | $ 19,009

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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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