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Share-Based Compensation - Weighted Average Assumptions Used in Monte Carlo Simulation Model to Estimate Fair Value of PRSUs Granted (Detail) - PRSUs [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 1.01% 0.79%
Expected life 3 years 3 years
Expected volatility 37.00% 43.00%