Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ 842 $ 429 $ 1,907 $ 324
Effective income tax rate 49.80% 39.80% 45.10% 28.70%
U.S. Federal rate     34.00%