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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense | $ 32,971 | $ 24,045 | $ 68,059 | $ 44,896
Tax benefit | 52,601 | 51,986 | 55,058 | 66,514
Earnings from Continuing Operations | 2,078 | 2,130 | 4,284 | 4,255
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 2,008 | 1,910 | 4,004 | 3,820
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 70 | 220 | 280 | 435
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 | (400) | (358) | (985) | (716)
Actuarial loss | 3,069 | 3,452 | 6,308 | 6,905
Tax benefit | (661) | (1,184) | (1,319) | (2,369)
Earnings from Continuing Operations | 2,008 | 1,910 | 4,004 | 3,820
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 | 2,669 | 3,094 | 5,323 | 6,189
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 | 364 | 458 | 720
Tax benefit | (41) | (144) | (178) | (285)
Earnings from Continuing Operations | $ 70 | $ 220 | $ 280 | $ 435

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