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Changes in Level Three Fixed Income Instrument Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Fixed Income	Dec. 31, 2011 Fixed Income	Dec. 31, 2012 Level 3	Dec. 31, 2012 Level 3 Fixed Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of year	$ 644,931	$ 601,448	$ 516,428	$ 482,767	$ 1,576
Purchases						1,532
Total unrealized gains						44
Fair value of plan assets at beginning of year	$ 644,931	$ 601,448	$ 516,428	$ 482,767	$ 1,576	$ 1,576

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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