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Share-Based Employee Compensation - Roll-Forward of Activity for Restricted Stock Units (Detail) - Restricted Stock Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Share units      
Nonvested number of Units, beginning balance 1,223    
Granted, number of units 564    
Vested, number of units (470)    
Forfeited, number of units (49)    
Nonvested number of units, ending balance 1,268 1,223  
Weighted Average Grant Date Fair Value      
Nonvested weighted Average Grant Date Fair Value, beginning balance $ 7.07    
Granted, weighted average grant date fair value 8.33 $ 8.21 $ 6.55
Vested, weighted average grant date fair value 6.56    
Forfeited, weighted average grant date fair value 8.15    
Nonvested weighted Average Grant Date Fair Value, ending balance $ 7.77 $ 7.07