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Schedule of Asset Allocation Policy and Ranges for Overall Risk and Return Objectives of Portfolio (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 100.00% | 100.00%
Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 23.00% |
Permitted Range, minimum | 10.00% |
Permitted Range, maximum | 30.00% |
Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 75.00% |
Permitted Range, minimum | 70.00% |
Permitted Range, maximum | 90.00% |
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 2.00% | 2.00%
Permitted Range, minimum | 0.00% |
Permitted Range, maximum | 10.00% |

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- Definition Defined benefit plan plan assets target allocation percentage range maximum. + References No definition available. + Details
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- Definition Defined benefit plan plan assets target allocation percentage range minimum. + 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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