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Pension Plans' Assets at Fair Value (Detail) (Pension Plans, Defined Benefit, USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension plans' asset at fair value	$ 395,859,000	$ 379,617,000	$ 353,562,000
Debt Securities
Pension plans' asset at fair value	394,977,000	379,088,000
Debt Securities \| Common Collective Trusts
Pension plans' asset at fair value	284,250,000	278,447,000
Debt Securities \| Mutual Funds
Pension plans' asset at fair value	2,666,000	3,656,000
Debt Securities \| US Government Agencies Debt Securities
Pension plans' asset at fair value	0	20,700,000
Debt Securities \| US Treasury Securities
Pension plans' asset at fair value	2,979,000	11,799,000
Debt Securities \| Corporate Debt Securities
Pension plans' asset at fair value	105,082,000	57,067,000
Debt Securities \| Municipal Obligations
Pension plans' asset at fair value	0	980,000
Debt Securities \| Asset-backed Securities
Pension plans' asset at fair value	0	2,602,000
Debt Securities \| Collateralized Mortgage Backed Securities
Pension plans' asset at fair value	0	3,837,000
Payables
Pension plans' asset at fair value	882,000	529,000
Fair Value, Inputs, Level 1 \| Debt Securities
Pension plans' asset at fair value	2,979,000	11,799,000
Fair Value, Inputs, Level 1 \| Debt Securities \| US Treasury Securities
Pension plans' asset at fair value	2,979,000	11,799,000
Fair Value, Inputs, Level 2 \| Debt Securities
Pension plans' asset at fair value	391,998,000	367,289,000
Fair Value, Inputs, Level 2 \| Debt Securities \| Common Collective Trusts
Pension plans' asset at fair value	284,250,000	278,447,000
Fair Value, Inputs, Level 2 \| Debt Securities \| Mutual Funds
Pension plans' asset at fair value	2,666,000	3,656,000
Fair Value, Inputs, Level 2 \| Debt Securities \| US Government Agencies Debt Securities
Pension plans' asset at fair value	0	20,700,000
Fair Value, Inputs, Level 2 \| Debt Securities \| Corporate Debt Securities
Pension plans' asset at fair value	105,082,000	57,067,000
Fair Value, Inputs, Level 2 \| Debt Securities \| Municipal Obligations
Pension plans' asset at fair value	0	980,000
Fair Value, Inputs, Level 2 \| Debt Securities \| Asset-backed Securities
Pension plans' asset at fair value	0	2,602,000
Fair Value, Inputs, Level 2 \| Debt Securities \| Collateralized Mortgage Backed Securities
Pension plans' asset at fair value	$ 0	$ 3,837,000

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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