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Share-Based Compensation - Roll-Forward of Activity for Phantom Stock Units (Detail) (Phantom Stock Units, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Phantom Stock Units
     
Number of Share units      
Nonvested number of Units, beginning balance 508    
Granted, number of units 0    
Vested, number of units (17)    
Forfeited, number of units (47)    
Nonvested number of units, ending balance 444 508  
Weighted Average Grant Date Fair Value      
Nonvested weighted Average Grant Date Fair Value, beginning balance $ 6.77    
Granted, weighted average grant date fair value $ 0.00 $ 6.37 $ 7.51
Vested, weighted average grant date fair value $ 7.51    
Forfeited, weighted average grant date fair value $ 7.04    
Nonvested weighted Average Grant Date Fair Value, ending balance $ 6.72 $ 6.77