Stock-Based Compensation (Performance-Contingent Return on Invested Capital Shares) - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Return on investment target over the two fiscal years immediately preceding the vesting date	1.75%
Percentage of shares that can be earned	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Return on investment target over the two fiscal years immediately preceding the vesting date	4.75%
Percentage of shares that can be earned	125.00%
Maximum \| 2015 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares that can be earned	100.00%
Maximum \| 2016 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares that can be earned	100.00%
Weighted Average Cost of Capital \| Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout, ROIC above WACC	50.00%
Weighted Average Cost of Capital \| Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout, ROIC above WACC	100.00%
Weighted Average Cost of Capital \| Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout, ROIC above WACC	125.00%
Return On Invested Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout	0.00%
Return On Invested Capital \| Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout, ROIC above WACC	1.75%
Return On Invested Capital \| Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout, ROIC above WACC	3.75%
Return On Invested Capital \| Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of payout, ROIC above WACC	4.75%
Performance Contingent Return On Invested Capital Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	$ 5.1
Expected weighted-average period to recognize compensation cost (years)	1 year 11 days
Performance Contingent Return On Invested Capital Shares \| Performance contingent Awards 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	18 months
Performance Contingent Return On Invested Capital Shares \| Performance contingent Awards subsequent to 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years

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Range of payout in percentage of target shares possible to earn.

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Return On Investment Share Based Compensation Arrangement By Share Based Payment Award Performance Condition target Percentage in excess of weighted average cost of capital.

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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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