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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Additional interest expense | $ 32,948 | $ 35,087
Tax benefit | (4,991) | 2,457
Earnings from Continuing Operations | 2,758 | 2,206
Pension and Postretirement Benefit Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings from Continuing Operations | 2,758 | 1,996
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings from Continuing Operations |  | 210
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 | (188) | (585)
Actuarial loss | 3,814 | 3,239
Tax benefit | (868) | (658)
Earnings from Continuing Operations | 2,758 | 1,996
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 | $ 3,626 | 2,654
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 |  | 347
Tax benefit |  | (137)
Earnings from Continuing Operations |  | $ 210

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