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Nonvested Restricted Stock Awards and Changes (Detail) (Restricted Stock, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Restricted Stock
 
Number of Shares  
Nonvested at beginning of period 1,038
Granted 764
Vested (811)
Cancelled/forfeited (73)
Nonvested at end of period 918
Weighted-Average Grant Date Fair Value  
Nonvested at beginning of period $ 13.02
Granted $ 13.16
Vested $ 11.00
Cancelled/forfeited $ 14.99
Nonvested at end of period $ 14.80