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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Current income tax expense	$ 14,029	$ 15,709
Deferred income tax expense (benefit)	(1,933)	(2,118)
Income tax expense, as reported	$ 12,096	$ 13,591
Effective tax rate	16.50%	19.80%

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.