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Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure |  |  |
Deferred taxes | $ (12,881) | $ (9,398) | $ (10,235)
United States Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure |  |  |
Prior service cost, before tax | 58 | 127 |
Deferred taxes | 539 | 514 |
Total recognized in other comprehensive income, net of tax | 597 | 641 |
Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure |  |  |
Prior service cost, before tax | (622) | (1,118) |
Deferred taxes | (1,472) | (1,292) |
Total recognized in other comprehensive income, net of tax | $ (2,094) | $ (2,410) |

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