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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Taxes [Line Items]        
Effective income tax rate 29.60% 28.20% 28.20% 27.90%
Minimum [Member]        
Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits $ 4,000,000   $ 4,000,000  
Maximum [Member]        
Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits $ 6,000,000   $ 6,000,000