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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense | $ 33,297 | $ 32,971 | $ 66,245 | $ 68,059
Tax benefit | 49,890 | 52,601 | 44,899 | 55,058
Earnings from Continuing Operations | 2,726 | 2,078 | 5,484 | 4,284
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 2,726 | 2,008 | 5,484 | 4,004
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations |  | 70 |  | 280
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior service credit | (184) | (400) | (396) | (985)
Actuarial loss | 3,832 | 3,069 | 7,670 | 6,308
Tax benefit | (922) | (661) | (1,790) | (1,319)
Earnings from Continuing Operations | 2,726 | 2,008 | 5,484 | 4,004
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Other Nonoperating Expense and (Income), Net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications out of accumulated other comprehensive loss before taxes | $ 3,648 | 2,669 | $ 7,274 | 5,323
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense |  | 111 |  | 458
Tax benefit |  | (41) |  | (178)
Earnings from Continuing Operations |  | $ 70 |  | $ 280

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