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Accumulated Other Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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 Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), Tax + References No definition available. + Details
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- Definition Defined Benefit Plan, Accumulated Other Comprehensive Income Net Transition Assets (Obligations), Tax + References No definition available. + Details
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