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Changes in level 3 asset measured at fair value master trust (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at end of year	$ 656,131	$ 579,523
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at beginning of year	2,511	2,491
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(223)	101
Defined Benefit Plan, Purchases, Sales, and Settlements	(154)	(81)
Fair value of plan assets at end of year	2,134	2,511
Master Trust [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at end of year	657,451	631,916
Master Trust [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at end of year	$ 2,134	$ 2,511

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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