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, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]    
Provision (benefit) for income taxes $ 7,653,000 $ 4,684,000
Effective income tax rate 41.00% 31.70%
Income tax expense includes increase in unrecognized tax benefit and stock based compensation 100,000  
Income tax expense includes discrete items   $ 779,000
Income tax years under examination December 31, 2004 through 2012