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Benefit Plans - Expected Weighted Average Long-Term Rate of Return (Detail) | 12 Months Ended |
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Dec. 31, 2017 | Jan. 01, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation 2018 | 100.00% |
Percentage of Plan Assets at Fiscal Year-End | 100.00% | 100.00%
Weighted Average Expected Long-Term Rate of Return - 2017 | 6.00% |
U.S. Large Capitalization Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation 2018 | 40.00% |
Percentage of Plan Assets at Fiscal Year-End | 41.00% | 41.00%
Weighted Average Expected Long-Term Rate of Return - 2017 | 3.00% |
U.S. Small/Mid-Capitalization Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation 2018 | 5.00% |
Percentage of Plan Assets at Fiscal Year-End | 5.00% | 5.00%
Weighted Average Expected Long-Term Rate of Return - 2017 | 0.50% |
International Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation 2018 | 15.00% |
Percentage of Plan Assets at Fiscal Year-End | 15.00% | 15.00%
Weighted Average Expected Long-Term Rate of Return - 2017 | 1.20% |
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation 2018 | 40.00% |
Percentage of Plan Assets at Fiscal Year-End | 39.00% | 39.00%
Weighted Average Expected Long-Term Rate of Return - 2017 | 1.30% |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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. + Details
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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 + Details
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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 + Details
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