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Performance Stock Activity (Detail) (Performance Shares, USD $)
12 Months Ended
Dec. 31, 2013
Performance Shares
 
Number of Shares  
Granted 80,872
Vested 39,084
Canceled 4,854
Nonvested shares at end of period 36,934
Weighted-Average Grant Date Fair Value per Share  
Granted $ 15.75
Vested $ 15.75
Canceled $ 15.56
Nonvested shares at end of period $ 15.78