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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Amortization of pension and other postretirement benefit plan items: |  |  |
Total net of tax | $ 7,864 | $ (6,463) | $ 22,104
Pension and Other Postretirement Benefit Plans [Member] | Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Amortization of pension and other postretirement benefit plan items: |  |  |
Actuarial losses | 5,410 |  |
Prior service credit | (131) |  |
Total before tax | 5,279 |  |
Tax benefit | (1,849) |  |
Total net of tax | $ (3,430) |  |

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