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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Share units      
Nonvested number of Units, beginning balance 1,419    
Granted, number of units 680    
Vested, number of units (797)    
Forfeited, number of units (26)    
Nonvested number of units, ending balance 1,276 1,419  
Weighted Average Grant Date Fair Value      
Nonvested weighted Average Grant Date Fair Value, beginning balance (in dollars per unit) $ 8.81    
Granted, weighted average grant date fair value (in dollars per unit) 10.94 $ 9.36 $ 8.33
Vested, weighted average grant date fair value (in dollars per units) 8.54    
Forfeited, weighted average grant date fair value (in dollars per unit) 9.47    
Nonvested weighted Average Grant Date Fair Value, ending balance (in dollars per unit) $ 10.09 $ 8.81  
Accrued incremental dividend equivalent rights (in shares) 6