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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Taxes [Line Items]        
Effective income tax rate 28.20% 35.40% 27.90% 35.00%
ASU No. 2016-09 | Adjustments for New Accounting Principle, Early Adoption | Restatement Adjustment        
Income Taxes [Line Items]        
Excess tax benefit reclassified to income tax expense $ 9,000,000   $ 14,200,000  
Minimum [Member]        
Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits 1,000,000   1,000,000  
Maximum [Member]        
Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits $ 5,000,000   $ 5,000,000