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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, 2012
Dec. 31, 2011
Phantom Stock Units
   
Number of Share units    
Nonvested number of Units, beginning balance 721  
Granted, number of units 401  
Vested, number of units (389)  
Forfeited, number of units (225)  
Nonvested number of units, ending balance 508 721
Weighted Average Grant Date Fair Value    
Nonvested weighted Average Grant Date Fair Value, beginning balance $ 7.68  
Granted, weighted average grant date fair value $ 6.37 $ 7.51
Vested, weighted average grant date fair value $ 7.79  
Forfeited, weighted average grant date fair value $ 7.22  
Nonvested weighted Average Grant Date Fair Value, ending balance $ 6.77 $ 7.68