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Employee Benefit Plans Weighted Average Asset Allocations by Asset Category (Detail) | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2015
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |
Actual Asset Allocation As of December 31 | 100.00% | 100.00%
Target Asset | 100.00% |
Equity securities |  |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |
Actual Asset Allocation As of December 31 | 32.00% | 31.00%
Target Asset | 31.00% |
Debt securities |  |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |
Actual Asset Allocation As of December 31 | 42.00% | 43.00%
Target Asset | 46.00% |
Insurance (annuity) contracts |  |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |
Actual Asset Allocation As of December 31 | 17.00% | 16.00%
Target Asset | 17.00% |
Real estate |  |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |
Actual Asset Allocation As of December 31 | 7.00% | 6.00%
Target Asset | 3.00% |
Other |  |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |
Actual Asset Allocation As of December 31 | 2.00% | 4.00%
Target Asset | 3.00% |

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- Definition Target allocation 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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- 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=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)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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