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Share-Based Employee Compensation - Roll-Forward of Activity for Phantom Stock Units (Detail) - Phantom Stock Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Share units    
Nonvested number of Units, beginning balance 264  
Granted, number of units 0 0
Vested, number of units (264)  
Forfeited, number of units 0  
Nonvested number of units, ending balance 0 264
Weighted Average Grant Date Fair Value    
Nonvested weighted Average Grant Date Fair Value, beginning balance $ 6.25  
Granted, weighted average grant date fair value 0.00  
Vested, weighted average grant date fair value 6.25  
Forfeited, weighted average grant date fair value 0.00  
Nonvested weighted Average Grant Date Fair Value, ending balance $ 0.00 $ 6.25