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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | $ 1,016,410 | $ 1,144,923
Balance | 998,896 | 1,127,685
Pension Benefits |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (236) | 2,194
Gains/(losses) recognized in OCI | 369 | 0
Balance | $ 133 | $ 2,194

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