The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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The interest rate used to adjust for the time value of money.

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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

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The amount of the cost recognized during the period for defined contribution plans.

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Employee hire date no longer eligible for noncontributory retirement plan.

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Maturity period of fixed income investments.

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Retirement Plans and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Employee hire date no longer eligible for noncontributory retirement plan	Dec. 08, 2009
Defined Benefit Plan, Expected Long-Term Rate of Return	7.50%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Maturity Period Of Fixed Income Investments	1 year
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Maturity Period Of Fixed Income Investments		10 years
Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	60.00%
Debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	40.00%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 44	$ 661	$ 531
Assumed discount rate	4.90%	4.00%
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate	4.90%	4.00%
Expected employer contributions for next fiscal year	166
Defined Benefit Plan, Expected Long-Term Rate of Return	7.50%	7.50%
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate	4.90%	4.00%
Expected employer contributions for next fiscal year	113
Defined Benefit Plan, Expected Long-Term Rate of Return	0.00%	0.00%
Deferred Salary Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 836	$ 765	$ 667