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Significant Accounting Policies - Changes in Accumulated Other Comprehensive Earnings Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 4,682,477 | $ 4,142,590
Other comprehensive earnings before reclassifications, net of tax | $ 365 | $ 838 | (698) | 1,364
Amounts reclassified from accumulated other comprehensive loss, net of tax | 4,027 | 2,140 | 8,311 | 6,395
Other comprehensive earnings, net of tax | 4,392 | 2,978 | 7,613 | 7,759
Ending Balance | 4,942,328 | 4,333,982 | 4,942,328 | 4,333,982
Pension and Postretirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (124,798) | (124,553) | (128,802) | (128,373)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 4,027 | 1,918 | 8,031 | 5,738
Other comprehensive earnings, net of tax | 4,027 | 1,918 | 8,031 | 5,738
Ending Balance | (120,771) | (122,635) | (120,771) | (122,635)
Foreign Currency |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (1,085) | (636) | (22) | (1,162)
Other comprehensive earnings before reclassifications, net of tax | 365 | 838 | (698) | 1,364
Other comprehensive earnings, net of tax | 365 | 838 | (698) | 1,364
Ending Balance | (720) | 202 | (720) | 202
Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (717) | (280) | (1,152)
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 222 | 280 | 657
Other comprehensive earnings, net of tax |  | 222 | 280 | 657
Ending Balance |  | (495) |  | (495)
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (125,883) | (125,906) | (129,104) | (130,687)
Ending Balance | $ (121,491) | $ (122,928) | $ (121,491) | $ (122,928)

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