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Fair Value of Plan Assets by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 509,877	$ 494,181
Equity Securities \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	239,076	256,524
Equity Securities \| International
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	50,599	51,715
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	216,156	182,519
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 4,046	$ 3,423

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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