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Accumulated Other Comprehensive Income Balances (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other Comprehensive Income (Loss) [Line Items]
Retirement plans prior service benefit, tax	$ (125)	$ (125)
Unrealized gains on marketable securities, tax	$ 835	$ 835

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- Definition

The tax effect from accumulated appreciation or loss, in value of the total of unsold securities at the end of an accounting period.

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No definition available.

+ Details

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- Definition

The tax effect from the total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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No definition available.

+ Details

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- Details

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