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Benefit Plans - Weighted-Average Asset Allocation of Pension Plan Assets (Detail) - Pension [Member]	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Equities	100.00%	100.00%
Domestic equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Equities	38.00%	37.00%
Foreign equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Equities	11.00%	11.00%
Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Equities	49.00%	50.00%
Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Equities	2.00%	2.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Equities	0.00%	0.00%

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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.

+ References

No definition available.

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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