v3.3.0.814
Income Taxes - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Effective tax rate (as a percent) 34.90% 33.50% 34.40% 34.10%