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Employee Benefit Plans - Status of Supplemental Executive Retirement Plan (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Other long-term liabilities | $ 61,918 | $ 61,170
Other accrued liabilities | 237,963 | $ 236,982
Supplemental Employee Retirement Plans, Defined Benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other long-term liabilities | 13,300 |
Other accrued liabilities | $ 300 |

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