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Benefit Plans - Target Allocation of Assets and Acceptable Ranges (Detail) - Pension [Member]	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	100.00%
Domestic equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	37.00%
Foreign equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	11.00%
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	50.00%
Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	2.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	0.00%
Minimum [Member] | Domestic equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	30.00%
Minimum [Member] | Foreign equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	5.00%
Minimum [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	40.00%
Minimum [Member] | Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	0.00%
Minimum [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	0.00%
Maximum [Member] | Domestic equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	41.00%
Maximum [Member] | Foreign equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	13.00%
Maximum [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	65.00%
Maximum [Member] | Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	4.00%
Maximum [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of assets	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 target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ 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)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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