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Pension Benefit and Retirement Health and Life Insurance Benefits (Additional Information) (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2015 USD ($) plan | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Number of defined benefit pension plans | plan |  |  | 3 |  |
Projected benefit obligation of plan with accumulated benefit obligation in excess of plan assets | $ 155,200 |  | $ 151,900 | $ 155,200 |
Accumulated benefit obligation of plan with accumulated benefit obligation in excess of plan assets | 155,200 |  | 151,900 | 155,200 |
Fair value of the plan assets of plan with accumulated benefit obligation in excess of plan assets | 137,600 |  | 139,300 | 137,600 |
Projected benefit obligation of plan with plan assets in excess of accumulated benefit obligation | 32,600 |  | 30,500 | 32,600 |
Accumulated benefit obligation of plan with plan assets in excess of accumulated benefit obligation | 32,600 |  | 30,500 | 32,600 |
Fair value of the plan assets of plan with plan assets in excess of accumulated benefit obligation | 33,000 |  | $ 31,700 | $ 33,000 |
Change in discount rate |  |  | 0.25% |  |
Discount rate |  |  | 4.25% | 4.00% |
Health care cost trend rate annual change |  |  | 0.50% |  |
Percentage point change in assumed health care cost trend rates |  |  | 1.00% |  |
Health care cost, employees age |  |  | 65 years |  |
Estimated employer contributions in 2015 |  |  | $ 300 |  |
Employer contributions |  |  | $ 6,500 | $ 13,000 |
Retirees of 65 Years Old or Younger |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  | 7.50% | 7.50% |
Ultimate health care cost trend rate |  |  | 4.50% |  |
Retirees of 65 Years Old or Older |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  | 7.50% | 7.50% |
Ultimate health care cost trend rate |  |  | 4.50% |  |
Pension Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, one-time cash payment |  |  | $ 8,541 | $ 24,934 |
Settlement charge | $ 5,200 |  | 0 | 3,530 |
Curtailment charges |  | $ 1,500 | 0 | $ 0 | $ (1,537)
Net loss to be recognized over next twelve months |  |  | $ 1,800 |  |
Discount rate |  |  | 4.00% | 4.75% |
Historical return on plan assets over 20 years |  |  | 8.40% |  |
Hypothetical long-term return on assets over last 20 years |  |  | 8.50% |  |
Hypothetical long-term return on assets over the last 10 years |  |  | 7.50% |  |
Expected long-term rate of return on plan assets |  |  | 6.50% |  |
Employer contributions |  |  | $ 6,971 | $ 13,871 |
Pension Benefits | Equity Securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Plan asset allocations | 23.00% |  | 27.00% | 23.00% |
Pension Benefits | Debt Securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Plan asset allocations | 77.00% |  | 73.00% | 77.00% |
Retirement Health and Life Insurance Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, one-time cash payment |  |  | $ 766 | $ 775 |
Settlement charge |  |  | 0 | 0 |
Curtailment charges |  |  | 0 | $ 0 | $ 0
Net loss to be recognized over next twelve months |  |  | $ 1,600 |  |
Discount rate |  |  | 3.00% | 3.25% |
Employer contributions |  |  | $ 766 | $ 775 |
Bear Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Remaining required employer contributions |  |  | $ 300 |  |

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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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