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Accumulated Other Comprehensive Income Balances (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Comprehensive Income (Loss) [Line Items]
Retirement plans prior service benefit, net of tax of $125 and $125	$ 2,786	$ 2,895
Unrealized gains on marketable securities, net of tax of $835 and $835	3,013	2,925
Total accumulated other comprehensive income	$ 5,799	$ 5,820

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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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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