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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Taxes [Line Items]    
Effective income tax rate 25.40% 27.40%
Minimum [Member]    
Income Taxes [Line Items]    
Reasonably possible decrease in unrecognized tax benefits $ 1,000,000  
Maximum [Member]    
Income Taxes [Line Items]    
Reasonably possible decrease in unrecognized tax benefits $ 2,000,000