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Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 29, 2018 | Dec. 31, 2017 | Dec. 30, 2017 | Dec. 31, 2016
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Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 335,540 | $ 335,540 | $ 340,854 | $ 340,854 | $ 335,663
Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 34,118 |  | 19,771 |  |
Equity Securities | Us Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 65,414 |  |
Equity Securities | International Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 665 |  |
Equity Securities | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] |  |  | 22,178 |  |
Equity Securities | Domestic Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] |  |  | 19,879 |  |
Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 4,581 |  | 6,538 |  |
Fixed Income Securities | US Government Agencies Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,561 |  | 10,531 |  |
Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 166,670 |  | 9,993 |  |
Fixed Income Securities | International Corporate Bonds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 53,709 |  |  |  |
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 |  |  |  | 3,004 |  |
Pending Transactions |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 59,452 |  | 62,000 |  |
Other Assets And Liabilities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets and (liabilities) | [3] | 2,636 |  | (133) |  |
Accrued (Expenses) Income |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | (40) |  | (79) |  |
Level 1 | Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 108,136 |  |
Level 1 | Equity Securities | Us Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 65,414 |  |
Level 1 | Equity Securities | International Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 665 |  |
Level 1 | Equity Securities | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] |  |  | 22,178 |  |
Level 1 | Equity Securities | Domestic Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] |  |  | 19,879 |  |
Level 2 | Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 262,639 |  | 49,837 |  |
Level 2 | Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 34,118 |  | 19,771 |  |
Level 2 | Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 4,581 |  | 6,538 |  |
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 |  | 3,561 |  | 10,531 |  |
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 166,670 |  | 9,993 |  |
Level 2 | Fixed Income Securities | International Corporate Bonds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 53,709 |  |  |  |
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 |  |  |  | 3,004 |  |
Other Investments Measured at Net Asset Value | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1],[4] |  |  | 22,878 |  |
Other Investments Measured at Net Asset Value | Hedge Funds, Equity |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4],[5] |  |  | 35,054 |  |
Other Investments Measured at Net Asset Value | Absolute Return Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4],[6] |  |  | 52,704 |  |
Other Investments Measured at Contract Value | Guaranteed Insurance Contracts |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [7],[8] | $ 10,853 |  | $ 10,457 |  |
[1] | This class includes funds with the principal strategy to invest primarily in long positions in international equity securities. This asset was reclassified from a Level 2 to a Level 1 type for all periods. This asset was incorrectly presented as a Level 2.
[2] | This class includes funds with the principal strategy to invest primarily in long positions in domestic equity securities.
[3] | This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.
[4] | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.
[5] | This class invests primarily in hedged equity funds.
[6] | This class invests primarily in absolute return strategy funds and are reported at NAV.
[7] | Certain investments, which are fully-benefit responsive investment contracts, are measured at contract value and have not been classified in the fair value hierarchy.
[8] | This class invests primarily guaranteed insurance contracts through various U.S. insurance companies.

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