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Defined Benefit Plans - Schedule of Assumptions Used (Detail) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Weighted-Average Assumptions Used to Determine Net Cost for Years Ended December 31: |  |  |
Expected long-term rate of return on plan assets | 6.60% |  |
Pension Benefits [Member] |  |  |
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31: |  |  |
Discount rate | 4.30% | 4.60% |
Rate of compensation increase | 4.00% | 4.00% |
Weighted-Average Assumptions Used to Determine Net Cost for Years Ended December 31: |  |  |
Discount rate | 4.60% | 4.20% | 5.00%
Expected long-term rate of return on plan assets | 6.60% | 6.80% | 7.40%
Rate of compensation increase | 4.00% | 4.00% | 4.00%
Postretirement Benefits [Member] |  |  |
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31: |  |  |
Discount rate | 3.40% | 4.10% |
Weighted-Average Assumptions Used to Determine Net Cost for Years Ended December 31: |  |  |
Discount rate | 4.10% | 3.50% | 4.30%

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- Definition The interest rate used to adjust for the time value of money for the 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)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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