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.

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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- 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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Employer Sponsored Benefit Plan - Target Allocation and the Actual Allocation of Plan Assets (Detail)	Dec. 31, 2017	Dec. 31, 2016
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	26.00%	30.00%
International equities
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	26.00%	30.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	40.00%	28.00%
Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	7.00%	10.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	1.00%	2.00%
Minimum \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	21.00%
Minimum \| International equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	21.00%
Minimum \| Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%
Minimum \| Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	3.00%
Minimum \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Maximum \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	31.00%
Maximum \| International equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	31.00%
Maximum \| Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%
Maximum \| Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	13.00%
Maximum \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%