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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock
     
Restricted Stock      
Beginning Balance 696,000    
Granted 307,000 368,000 266,000
Vested (6,000)    
Forfeited (315,000)    
Ending Balance 682,000 696,000  
Weighted Average Grant Price      
Beginning Balance $ 23.28    
Granted $ 29.23 $ 26.08 $ 23.57
Vested $ 28.22    
Forfeited $ 23.60    
Ending Balance $ 25.77 $ 23.28