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Income taxes - Schedule of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Expected income tax expense, at statutory rate			$ 11,048	$ 14,571
U.S. state income tax expense, net			1,430	2,436
Other, net			(479)	26
Income tax expense	$ 3,046	$ 4,544	$ 11,999	$ 17,033

- Definition

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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- 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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