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Pension Benefits - Pension Plans with Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 125,945	$ 113,460
Fair value of plan assets	106,616	85,432
Accumulated benefit obligation	4,350	35,358
Fair value of plan assets	$ 2,795	$ 31,815

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