Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (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]        
Effective tax rates 33.20% 24.30% 31.90% (78.30%)
Income tax expense (benefit) $ 14,059 $ 3,725 $ 20,970 $ (3,007)
Estimated effective tax rate     32.00%  
Statutory federal rate 35.00%   35.00%