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Summary of Basis Used to Measure Defined Benefit Plans Assets at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | $ 76,141 |  | $ 94,238 |
Equity Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 14,968 | [1] | 19,779 | [1]
United States Absolute Return Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 38,449 | [1] | 45,555 | [1]
Non United States Absolute Return Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 21,709 | [1] | 26,685 | [1]
Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  |  | 2,219 | [2]
Defined benefit plan, fair value of plan assets | 1,015 | [2] |  |
Fair Value, Inputs, Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 70,952 |  | 86,451 |
Fair Value, Inputs, Level 1 | Equity Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 14,968 | [1] | 19,779 | [1]
Fair Value, Inputs, Level 1 | United States Absolute Return Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 38,449 | [1] | 45,555 | [1]
Fair Value, Inputs, Level 1 | Non United States Absolute Return Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 16,520 | [1] | 18,898 | [1]
Fair Value, Inputs, Level 1 | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  |  | 2,219 | [2]
Defined benefit plan, fair value of plan assets | 1,015 | [2] |  |
Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | 5,189 |  | 7,787 |
Fair Value, Inputs, Level 2 | Non United States Absolute Return Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | $ 5,189 | [1] | $ 7,787 | [1]
[1] | Primarily funds invested by managers that have a global mandate with the flexibility to allocate capital broadly across a wide range of asset classes and strategies including, but not limited to equities, fixed income, commodities, interest rate futures, currencies and other securities to outperform an agreed benchmark with specific return and volatility targets.
[2] | Primarily cash and cash equivalents.

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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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- Definition Amount of other defined benefit plan costs. + References No definition available. + Details
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