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Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | $ 282,129 | $ 302,899
Fixed Income Securities | Corporate Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 156,860 | 157,263
Fixed Income Securities | US Government Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 62,555 | 82,674
Fixed Income Securities | U.K. Government Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 19,610 | 8,593
Fixed Income Securities | Asset-backed Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 2,919 | 2,042
U.S. Equity (Large Cap) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 21,309 | 23,832
International Equity |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 14,803 | 23,990
Guarantee Annuity Contract |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 2,985 | 3,108
Other |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 906 | 839
Cash and Cash Equivalents |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 182 | 558
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 21,561 | 23,712
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 | 21,415 | 23,712
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 146 |
Significant Other Observable Inputs (Level 2) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 260,568 | 279,187
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | Corporate Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 156,860 | 157,263
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | US Government Debt Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 41,140 | 58,962
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | U.K. Government Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 19,610 | 8,593
Significant Other Observable Inputs (Level 2) | Fixed Income Securities | Asset-backed Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 2,919 | 2,042
Significant Other Observable Inputs (Level 2) | U.S. Equity (Large Cap) |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 21,309 | 23,832
Significant Other Observable Inputs (Level 2) | International Equity |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 14,803 | 23,990
Significant Other Observable Inputs (Level 2) | Guarantee Annuity Contract |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 2,985 | 3,108
Significant Other Observable Inputs (Level 2) | Other |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | 906 | 839
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Total | $ 36 | $ 558

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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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