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Pension Plans with Accumulated Benefit Obligation or Projected Benefit Obligation in Excess of Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension plans with an accumulated benefit obligation in excess of plan assets:
Fair value of plan assets	$ 419,771	$ 385,483
Accumulated benefit obligation	625,884	557,712
Pension plans with a projected benefit obligation in excess of plan assets:
Fair value of plan assets	419,771	385,483
Accumulated benefit obligation	$ 661,571	$ 586,808

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details