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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Income taxes, net $ 13,283 $ 12,659 $ 22,851 $ 20,462
Effective tax rate 43.70% 42.60% 42.70% 41.40%