v3.2.0.727
Income Taxes - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Effective tax rate (as a percent) 33.50% 33.50% 34.00% 34.40%