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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Provision (benefit) for income taxes for continuing operations $ 6,866,000 $ 5,958,000 $ 14,710,000 $ 10,926,000
Effective income tax rate 37.37% 38.98%    
Discrete deferred tax benefit 400,000      
Valuation allowance $ 0   $ 0  
Income tax years under examination     December 31, 2004 through 2012