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Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | $ 302,899 | $ 339,580
Fixed Income Securities | Corporate Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 157,263 | 172,401
Fixed Income Securities | US Government Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 82,674 | 102,027
Fixed Income Securities | U.K. Government Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 8,593 | 7,553
Fixed Income Securities | Asset-backed Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 2,042 | 4,604
U.S. Equity (Large Cap) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 23,832 | 27,725
International Equity |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 23,990 | 21,285
Guarantee Annuity Contract |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 3,108 | 2,863
Other |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 839 | 711
Cash and Cash Equivalents |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 558 | 411
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 23,712 | 5,136
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fixed Income Securities | US Government Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 23,712 | 5,136
Significant Other Observable Inputs (Level 2) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 279,187 | 334,444
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | Corporate Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 157,263 | 172,401
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | US Government Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 58,962 | 96,891
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | U.K. Government Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 8,593 | 7,553
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | Asset-backed Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 2,042 | 4,604
Significant Other Observable Inputs (Level 2) | U.S. Equity (Large Cap) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 23,832 | 27,725
Significant Other Observable Inputs (Level 2) | International Equity |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 23,990 | 21,285
Significant Other Observable Inputs (Level 2) | Guarantee Annuity Contract |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 3,108 | 2,863
Significant Other Observable Inputs (Level 2) | Other |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 839 | 711
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | $ 558 | $ 411

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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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