Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Abstract]    
Effective income tax rate 31.66% 1.07%
Provision for Income Taxes $ 4,684,000 $ 79,000
Income tax expense includes stock options and state tax adjustment $ 779,000