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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Current income tax expense	$ 12,315	$ 17,465	$ 28,024	$ 37,517
Deferred income tax expense (benefit)	379	(1,438)	(1,739)	(3,977)
Income tax expense, as reported	$ 12,694	$ 16,027	$ 26,285	$ 33,540
Effective tax rate	17.50%	21.60%	18.60%	22.00%

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.