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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense | $ 35,468 | $ 23,141 | $ 103,526 | $ 68,037
Tax benefit | 29,089 | 52,763 | 84,147 | 119,277
Earnings from Continuing Operations | 4,027 | 2,140 | 8,311 | 6,395
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 4,027 | 1,918 | 8,031 | 5,738
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations |  | 222 | 280 | 657
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 | (492) | (402) | (1,479) | (1,070)
Actuarial loss | 3,153 | 3,513 | 9,463 | 10,370
Tax benefit | (1,326) | (1,193) | (2,645) | (3,562)
Earnings from Continuing Operations | 4,027 | 1,918 | 8,031 | 5,738
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Other Nonoperating Income, Net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications out of accumulated other comprehensive loss before taxes | $ 5,353 | 3,111 | 10,676 | 9,300
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 |  | 369 | 458 | 1,089
Tax benefit |  | (147) | (178) | (432)
Earnings from Continuing Operations |  | $ 222 | $ 280 | $ 657

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