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Income Taxes - Schedule of Effective Income Tax Rate Continuing Operations (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Income tax benefit rate 37.60% 24.20% 29.40% 18.10%