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Retirement Benefits - Fair Value of Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 732,502 | $ 825,806
Equity Securities | United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 350,728 | 391,527
Equity Securities | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 73,415 | 82,571
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 304,128 | 347,612
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 4,231 | $ 4,096

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