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Incentive Compensation Plan - Unvested Target Award (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nonvested Restricted Stock Units Activity [Line Items]      
Outstanding, beginning of the year, Shares 50,060 34,338 20,103
Granted, Shares 224,000 35,000 30,120
Vested, Shares 17,060 19,278 15,885
Forfeited, Shares (4,000) 0 0
Outstanding, end of the year, Shares 253,000 50,060 34,338
Outstanding, beginning of the year, Weighted Average Grant Date Fair Value $ 6.00 $ 6.52 $ 11.53
Granted, Weighted Average Grant Date Fair Value $ 5.65 $ 6.13 $ 5.70
Vested, Weighted Average Grant Date Fair Value $ 5.73 $ 7.16 $ 11.32
Forfeited, Weighted Average Grant Date Fair Value $ 5.96 $ 0.00 $ 0.00
Outstanding, end of the year, Weighted Average Grant Date Fair Value $ 5.71 $ 6.00 $ 6.52
Restricted Stock [Member]
      
Nonvested Restricted Stock Units Activity [Line Items]      
Outstanding, beginning of the year, Shares 93,333 0  
Granted, Shares 74,000 126,000  
Vested, Shares 0 0  
Forfeited, Shares (16,000) (32,667)  
Outstanding, end of the year, Shares 151,333 93,333  
Outstanding, beginning of the year, Weighted Average Grant Date Fair Value $ 7.03 $ 0.00  
Granted, Weighted Average Grant Date Fair Value $ 5.96 $ 7.03  
Vested, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00  
Forfeited, Weighted Average Grant Date Fair Value $ 6.63 $ 7.03  
Outstanding, end of the year, Weighted Average Grant Date Fair Value $ 6.55 $ 7.03