Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Provisions charged from operations for the profit sharing plan and retirement savings plans	$ 50	$ 51	$ 33
Contribution of common stock to profit sharing plan	1.0	0.9	0.9
Defined benefit pension plan corridor rate	10.00%
Percentage of equity allocation, maximum	70.00%see_PercentageOfEquityAllocationMaximum
Percentage of fixed income allocation, minimum	30.00%
Equity Security [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities, minimum	40.00%
Equity securities, maximum	50.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities, minimum	50.00%
Equity securities, maximum	60.00%

Contributions to or provisions for the profit sharing plan and retirement savings plans charged against earnings.

No definition available.

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- Definition

Contribution toward common stock as part of contribution to the profit sharing plan.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan corridor percentage.

+ References

No definition available.

+ Details

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- Definition

Percentage of equity allocation maximum.

+ References

No definition available.

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- Definition

Percentage of fixed income allocation including cash minimum.

+ References

No definition available.

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- Definition

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

+ 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 (d)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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- Definition

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

+ References

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