Employee Benefits Plans - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Pension charges	$ 2,063,000
Settlement losses and curtailment charges	1,200,000	5,900,000	4,100,000
Prepaid pension asset	33,400,000	35,100,000
Accumulated benefit obligation of the pension plan	26,700,000	25,800,000
Estimated actuarial loss that will be amortized from accumulated other comprehensive income into net periodic pension cost in 2013	400,000
Expected long-term rate of return on plan assets	4.75%	5.00%	6.00%
Matching contributions for the first 1%	100.00%
Matching contributions for the next 5%	50.00%
Maximum eligible compensation	3.50%
Company contributions to the plan		$ 200,000	$ 400,000
fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation percentage, minimum	65.00%
Plan asset target allocation percentage, maximum	95.00%
Equity type investments
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation percentage, minimum	5.00%
Plan asset target allocation percentage, maximum	35.00%

Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Settlement Loss And Curtailment Charge.

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- Definition

Matching Contributions For First Five Percent

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Matching Contributions For First One Percent

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- Definition

Maximum eligible compensation.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ References

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The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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- Definition

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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Cumulative employer's contributions in excess of net pension cost recognized, before the adoption of the recognition provisions of FAS 158. Under FAS 158, prepaid pension costs are no longer recognized in the statement of financial position. Note that there is a separate concept for noncurrent assets relating to defined benefit pension and other defined benefit postretirement plans for use under the recognition provisions of FAS 158.

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