Benefit Plans - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
Apr. 30, 2013	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]
Decrease in projected benefit obligations		$ (22,900,000)
Decrease in accumulated other comprehensive income, net of tax		(19,900,000)
Discount rate for the re-measure of pension benefit obligation		4.87%	4.87%	4.26%
Expected rate of return on plan assets			7.50%	7.50%
Curtailment loss		(750,000)	(750,000)
Increase in fair value of qualified plan assets			32,900,000
Increased percent in fair value of qualified plan assets			23.70%
Fair value of plan assets		171,800,000	171,800,000	138,900,000
Contribution to qualified plan	25,000,000
Decrease in total net periodic pension expense			$ 2,100,000
Percentage increase in contribution			6.00%

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

+ References

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

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

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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.

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- Definition

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

+ References

+ Details

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- Definition

The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

+ 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 (h)(7)

-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

-Glossary Plan Curtailment

-URI http://asc.fasb.org/extlink&oid=6520938

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

The after-tax change in accumulated other comprehensive income from the remeasurement of the defined benefit plan due to plan freeze.

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No definition available.

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- Definition

The pre-tax change in pension benefit obligation from the remeasurement of the defined benefit plan due to plan freeze.

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No definition available.

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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.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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