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Significant Accounting Policies - Changes in Accumulated Other Comprehensive Earnings Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 4,949,412 | $ 4,682,477
Other comprehensive earnings (loss) before reclassifications, net of tax | 497 | (587)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2,758 | 2,206
Other comprehensive earnings (loss), net of tax | 3,255 | 1,619
Ending Balance | 4,975,496 | 4,679,830
Pension and Postretirement Benefit Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (141,505) | (128,802)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2,758 | 1,996
Other comprehensive earnings (loss), net of tax | 2,758 | 1,996
Ending Balance | (138,747) | (126,806)
Foreign Currency |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (2,074) | (22)
Other comprehensive earnings (loss) before reclassifications, net of tax | 497 | (587)
Other comprehensive earnings (loss), net of tax | 497 | (587)
Ending Balance | (1,577) | (609)
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance |  | (280)
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 210
Other comprehensive earnings (loss), net of tax |  | 210
Ending Balance |  | (70)
Accumulated Other Comprehensive Loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (143,579) | (129,104)
Ending Balance | $ (140,324) | $ (127,485)

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