Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Increase in fair value of qualified plan assets		$ 6,300,000
Increased percent in fair value of qualified plan assets		3.40%
Fair value of plan assets	191,200,000	191,200,000	184,900,000
Contributions to qualified plan	0
Decrease in total net periodic pension expense	$ 1,400,000	$ 4,300,000
Percentage increase in contribution		6.00%

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

+ References

+ Details

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

The amount of increase or decrease in the fair value of plan assets during the reporting period.

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- Definition

Defined benefit plan effect of one percentage point decrease on net periodic pension benefit expense.

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No definition available.

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- Definition

The amount represents a percentage increase in the fair value of Plan assets from the last annual period.

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No definition available.

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- Definition

Percentage of increase in matching contribution to align with retirement plan match.

+ References

No definition available.

+ Details

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