Income Tax Provision - Schedule of Components of Income Tax Provision (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Expected tax provision at U.S. federal statutory income tax rate of 35%			$ 27,200,000	$ 28,700,000
Non-U.S. tax rates			(700,000)	(900,000)
Incremental U.S. tax and rate differences on equity in earnings			(6,100,000)	(6,600,000)
U.S. state income taxes, net			400,000	400,000
Tax rate change				(1,400,000)
Other, net			(900,000)	(800,000)
Total	$ 3,066,000	$ 11,530,000	$ 19,882,000	$ 19,388,000

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 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 the income tax rates under enacted tax laws in the period.

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- Definition

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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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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