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Fair Value of Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 759,551 | $ 704,779
Equity Securities | United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 357,789 | 336,297
Equity Securities | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 76,189 | 70,552
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 321,597 | 294,125
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 3,976 | $ 3,805

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