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Stock-Based Compensation - Schedule of Assumptions used in Valuing Stock Options Granted (Detail) - Stock Options [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividends 0.00% 0.00%
Risk-free interest rate, minimum 1.30% 1.10%
Risk-free interest rate, maximum 1.90% 2.00%
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 26.00% 27.00%
Expected life (in years) 4 years 1 month 6 days 3 years 1 month 6 days
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 30.00% 35.00%
Expected life (in years) 6 years 3 months 18 days 7 years