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Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 370,497 |  | $ 378,194 |  |
Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5,200 |  | 6,701 |  |
Equity Securities | Domestic Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 54,949 |  | 63,551 |  |
Equity Securities | Us Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 93,600 |  | 94,739 |  |
Equity Securities | International Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1,957 |  | 2,700 |  |
Equity Securities | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 53,971 |  | 45,851 |  |
Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5,257 |  | 4,664 |  |
Fixed Income Securities | US Government Agencies Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,215 |  | 874 |  |
Fixed Income Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 7,201 |  | 2,333 |  |
Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2,787 |  | 2,452 |  |
Real Estate Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 17,336 |  | 14,651 |  |
Hedge Funds, Equity |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 500 |  | 14,300 |  |
Other Assets And Liabilities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | 183 |  | 184 |  |
Accrued (Expenses) Income |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | (375) |  | (470) |  |
Other Investments | Guaranteed Insurance Contracts |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] | 9,784 |  | 9,450 |  |
Other Investments | Hedge Funds, Equity |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [7] | 40,582 | [6] | 52,420 | [8] |
Other Investments | Absolute Return Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [9] | 74,850 |  | 78,094 | [10] |
Level 1 |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 150,506 |  | 160,990 |  |
Level 1 | Equity Securities | Domestic Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 54,949 |  | 63,551 |  |
Level 1 | Equity Securities | Us Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 93,600 |  | 94,739 |  |
Level 1 | Equity Securities | International Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1,957 |  | 2,700 |  |
Level 2 |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 77,631 |  | 62,875 |  |
Level 2 | Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5,200 |  | 6,701 |  |
Level 2 | Equity Securities | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 53,971 |  | 45,851 |  |
Level 2 | Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5,257 |  | 4,664 |  |
Level 2 | Fixed Income Securities | US Government Agencies Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,215 |  | 874 |  |
Level 2 | Fixed Income Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 7,201 |  | 2,333 |  |
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2,787 |  | 2,452 |  |
Level 3 |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 142,360 |  | 154,329 |  | $ 161,578
Level 3 | Guaranteed Insurance Contracts |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 9,784 |  | 9,450 |  | 9,594
Level 3 | Real Estate Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 17,336 | [3] | 14,651 | [3] | 13,298
Level 3 | Hedge Funds, Equity |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 40,582 |  | 52,420 |  | $ 58,176
Level 3 | Other Assets And Liabilities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | 183 |  | 184 |  |
Level 3 | Accrued (Expenses) Income |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | (375) |  | (470) |  |
Level 3 | Other Investments | Guaranteed Insurance Contracts |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] | 9,784 |  | 9,450 |  |
Level 3 | Other Investments | Hedge Funds, Equity |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [7] | 40,582 | [6] | 52,420 | [8] |
Level 3 | Other Investments | Absolute Return Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [9] | $ 74,850 |  | $ 78,094 | [10] |
[1] | There is a pending sale for an asset in this classification.
[2] | This class includes funds with the principal strategy to invest primarily in long positions in international equity securities.
[3] | This class includes funds that invest primarily in U.S. commercial real estate.
[4] | This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.
[5] | This class invests primarily guaranteed insurance contracts through various U.S. insurance companies.
[6] | Pending sale requests of $0.5 million apply to assets reported in this classification.
[7] | This class invests primarily in hedged equity funds.
[8] | Pending sale requests of $14.3 million apply to assets reported in this classification.
[9] | This class invests primarily in absolute return strategy funds.
[10] | Pending sale requests of $8.0 million apply to assets reported in this classification.

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- Definition Schedule of Pension Plan Assets by Fair Value [Line Items] + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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