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Significant Accounting Policies - Changes in Accumulated Other Comprehensive Loss Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 4,975,496 | $ 4,679,830 | $ 4,949,412 | $ 4,682,477
Other comprehensive earnings (loss) before reclassifications, net of tax | 264 | (476) | 761 | (1,063)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2,726 | 2,078 | 5,484 | 4,284
Other comprehensive earnings (loss), net of tax | 2,990 | 1,602 | 6,245 | 3,221
Ending Balance | 5,097,270 | 4,855,470 | 5,097,270 | 4,855,470
Pension and Postretirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (138,747) | (126,806) | (141,505) | (128,802)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2,726 | 2,008 | 5,484 | 4,004
Other comprehensive earnings (loss), net of tax | 2,726 | 2,008 | 5,484 | 4,004
Ending Balance | (136,021) | (124,798) | (136,021) | (124,798)
Foreign Currency |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (1,577) | (609) | (2,074) | (22)
Other comprehensive earnings (loss) before reclassifications, net of tax | 264 | 476 | 761 | (1,063)
Other comprehensive earnings (loss), net of tax | 264 | 476 | 761 | (1,063)
Ending Balance | (1,313) | (1,085) | (1,313) | (1,085)
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (70) |  | (280)
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 70 |  | 280
Other comprehensive earnings (loss), net of tax |  | 70 |  | 280
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (140,324) | (127,485) | (143,579) | (129,104)
Ending Balance | $ (137,334) | $ (125,883) | $ (137,334) | $ (125,883)

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