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Stock-Based Compensation (Summary Of Share Based Payment Other Than Options Valuation Assumptions) (Detail)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Expected volatility of stock price 46.00% 37.00%
Risk-free interest rate 0.99% 0.74%
Valuation period 3 years P3Y0M0D
Dividend yield 0.00% 0.00%