Stock-Based Compensation (Performance-Contingent Restricted Stock) - Additional Information (Detail) - Jul. 18, 2015 - USD ($) $ in Thousands	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional common shares issued	48,069
Maximum percentage of change in grant	88.00%
Dividends paid on vested performance-contingent restricted stock awards	$ 879
Performance Contingent Return On Invested Capital Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of change in grant	125.00%
Total share holder return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional common shares issued	100,090
Expected weighted-average period to recognize compensation cost (years)	1 year 4 months 17 days
Performance Contingent Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends paid on vested performance-contingent restricted stock awards	$ 900
Award vesting tax windfall	1,400
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	15,600
Total fair value of shares vested	$ 18,400

Percentage of change in grants maximum.

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 740

-Section 45

-Paragraph 2

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-Subparagraph (SX 210.3-04)

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

+ References

No definition available.

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Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

+ References

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-Publisher FASB

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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