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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2011
Restricted Stock
 
Restricted Stock  
Beginning Balance 438,000
Granted 266,000
Vested (287,000)
Forfeited (2,000)
Ending Balance 415,000
Weighted Average Grant Price  
Beginning Balance $ 17.01
Granted $ 23.57
Vested $ 25.24
Forfeited $ 22.84
Ending Balance $ 19.64