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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense | $ 32,436 | $ 35,468 | $ 98,680 | $ 103,526
Tax benefit | 66,178 | 29,089 | 111,077 | 84,147
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 2,726 | 4,027 | 8,210 | 8,031
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations |  |  |  | 280
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Settlement expense |  | 2,692 |  | 2,692
Prior service credit | (188) | (492) | (566) | (1,479)
Actuarial loss | 3,813 | 3,153 | 11,465 | 9,463
Tax benefit | (899) | (1,326) | (2,689) | (2,645)
Earnings from Continuing Operations | 2,726 | 4,027 | 8,210 | 8,031
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 | $ 3,625 | $ 5,353 | $ 10,899 | 10,676
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 |  |  |  | 458
Tax benefit |  |  |  | (178)
Earnings from Continuing Operations |  |  |  | $ 280

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