Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Schedule of Provision for Income Taxes (Detail)

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Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
Federal $ 4,910 $ 4,325 $ 11,425 $ 10,060
State 687 606 1,600 1,409
Provision for income taxes $ 5,597 $ 4,931 $ 13,025 $ 11,469