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Significant Accounting Policies - Changes in Accumulated Other Comprehensive Loss Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 5,097,270 | $ 4,855,470 | $ 4,949,412 | $ 4,682,477
Other comprehensive earnings (loss), net of tax | 2,569 | 4,392 | 8,814 | 7,613
Ending Balance | 5,304,438 | 4,942,328 | 5,304,438 | 4,942,328
Pension and Postretirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (136,021) | (124,798) | (141,505) | (128,802)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2,726 | 4,027 | 8,210 | 8,031
Other comprehensive earnings (loss), net of tax |  | 4,027 |  | 8,031
Ending Balance | (133,295) | (120,771) | (133,295) | (120,771)
Foreign Currency |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (1,313) | (1,085) | (2,074) | (22)
Other comprehensive earnings (loss) before reclassifications, net of tax |  | 365 |  | (698)
Amounts reclassified from accumulated other comprehensive loss, net of tax | (157) |  | 604 |
Other comprehensive earnings (loss), net of tax |  | 365 |  | (698)
Ending Balance | (1,470) | (720) | (1,470) | (720)
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 |  |  |  | 280
Other comprehensive earnings (loss), net of tax |  |  |  | 280
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (137,334) | (125,883) | (143,579) | (129,104)
Other comprehensive earnings (loss) before reclassifications, net of tax |  | 365 |  | (698)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2,569 | 4,027 | 8,814 | 8,311
Other comprehensive earnings (loss), net of tax |  | 4,392 |  | 7,613
Ending Balance | $ (134,765) | $ (121,491) | $ (134,765) | $ (121,491)

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