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Deferred Tax Assets Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Deferred Income Tax Assets And Liabilities [Line Items] |  |
Employee and retiree benefit plans | $ 38,401 | $ 38,626
Depreciation and amortization | (170,630) | (213,002)
Inventories | 10,851 | 10,274
Allowances and accruals | 7,629 | 14,103
Interest rate exchange agreement | 20,856 | 23,714
Other | 7,059 | 10,033
Net deferred tax liabilities | $ (85,834) | $ (116,252)

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