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Summary of Activity in Level 3 Pension Assets (Detail) (Level 3, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Level 3
Defined Benefit Plan Disclosure [Line Items]
Beginning balance, January 1	$ 3,438	$ 3,564
Lease payments received	296	392
Unrealized gain (loss)	30	(126)
Transfers out of Level 3	(296)	(392)
Ending balance, December 31	$ 3,468	$ 3,438

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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