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Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets |  |  |  |
Accrued liabilities and reserves | $ 86,714 |  | $ 58,420 |
Postretirement benefits | 79,065 |  | 82,823 |
Employee compensation & benefits | 95,170 |  | 49,404 |
Tax loss and credit carryforwards | 398,921 |  | 24,350 |
Other | 53,531 |  | 4,698 |
Total deferred tax assets | 713,401 |  | 219,695 |
Valuation allowance | 167,640 | [1] | 13,242 | [1]
Deferred tax assets, net of valuation allowance | 545,761 |  | 206,453 |
Deferred tax liabilities |  |  |  |
Property, plant and equipment | 97,370 |  | 43,572 |
Goodwill and other intangibles | 779,176 |  | 290,939 |
Total deferred tax liabilities | 876,546 |  | 334,511 |
Net deferred tax liabilities | $ 330,785 |  | $ 128,058 |
[1] | The increase in valuation allowance from 2011 to 2012 was primarily related to balances acquired in the Merger.

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