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Total Investments Plans Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 601,448	$ 538,396
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	482,767	514,594
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102,785	23,424
Cash and Accrued Items
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,896	378
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	522,825	538,396
Level 1 \| Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	482,767	514,594
Level 1 \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24,162	23,424
Level 1 \| Cash and Accrued Items
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,896	378
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78,623
Level 2 \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 78,623

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.

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