Plan's funded status (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Projected Benefit Obligation:
Projected obligation at January 1	$ 32,387	$ 30,633
Interest cost	1,534	1,541	1,490
Actuarial loss	137	360
Benefit payments	(702)	(1,484)
Increase related to discount rate change	5,483	1,337
Projected obligation at December 31	38,839	32,387	30,633
Reconciliation of Fair Value of Plan Assets:
Fair value of plan assets at January 1	29,341	26,839
Actual return on plan assets	1,951	986
Contribution	0	3,000
Benefit payments	(702)	(1,484)
Fair value of plan assets at December 31	30,590	29,341	26,839
Funded status at December 31	(8,249)	(3,046)
Accumulated benefit obligation at December 31	38,839	32,387
Unrecognized net actuarial loss	14,879	11,240	10,618
Net periodic pension cost not yet recognized	$ 14,879	$ 11,240	$ 10,618

Defined Benefit Plan Actuarial Loss.

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Defined Benefit Plan Assets.

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No definition available.

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Defined Benefit Plan Net Periodic Pension Cost Not Yet Recognized.

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No definition available.

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Defined Benefit Plan Unrecognized Net Actuarial Loss.

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No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Net increase or decrease in the plan benefit obligation during the reporting period.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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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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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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