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Accumulated Other Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Retirement plans net actuarial loss, tax portion	$ (125)	$ 9
Unrealized gain on marketable securities tax	$ 835	$ 666

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- Definition

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- Definition

Defined Benefit Plan, Accumulated Other Comprehensive Income Net Transition Assets (Obligations), Tax

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