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Changes in Fair Value of Plan's Level Three Assets (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Level 3	Dec. 31, 2011 Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets, beginning of year	$ 60,097	$ 60,953	$ 70,189	$ 810	$ 582
Cash receipts				110	110
Unrealized gains relating to instruments still held at the reporting date				117	228
Transfers to Level 1				(110)	(110)
Fair value of assets, end of year	$ 60,097	$ 60,953	$ 70,189	$ 927	$ 810

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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