Computed Amount and Differences in Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Or Income Before Income Taxes [Line Items]
Pretax income	$ 86,204	$ 273,881	$ 231,874
Computed amount at statutory rate of 35%	30,171	95,858	81,156
State and local income tax (net of federal tax benefit)	2,406	1,515	2,766
Taxes on non-U.S. earnings-net of foreign tax credits	1,189	(4,522)	(8,545)
Effect of flow-through entities	(7,846)	(6,922)	(516)
Asset impairments	28,524
U.S. business tax credits		(917)	(935)
Domestic activities production deduction	(5,267)	(4,589)	(4,720)
Other	(603)	(399)	5,568
Total provision for income taxes	$ 48,574	$ 80,024	$ 74,774

Effect of pass through entities on tax

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the deduction for qualified production activities received under enacted tax laws.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to total foreign income tax expense or benefit. The foreign income tax expense or benefit difference represents the income tax expense or benefit at applicable domestic statutory income tax rates applied to foreign earnings or loss for the period versus the foreign income tax expense or benefit calculated by applying the appropriate foreign tax rates.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible impairment losses under enacted tax laws.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in other income tax contingencies, whether recorded or adjusted, during the period not otherwise listed in the existing taxonomy.

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