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Asset Allocations of Postretirement Benefit Plans (Detail) | 12 Months Ended
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Dec. 31, 2016
Cash and cash equivalents |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 0.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 20.00%
Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 15.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 65.00%
Fixed income |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 10.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 60.00%
Private equity funds |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 0.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 15.00%
Real estate funds |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 0.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 10.00%
Hedge funds |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 0.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 20.00%
Commodities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage of assets, range minimum | 0.00%
Defined benefit plan, target allocation percentage of assets, range maximum | 25.00%

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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -URI http://asc.fasb.org/extlink&oid=65897934&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)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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