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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock
     
Restricted Stock      
Beginning Balance 415,000    
Granted 368,000 [1] 266,000 300,000
Vested (75,000)    
Forfeited (12,000)    
Ending Balance 696,000 415,000  
Weighted Average Grant Price      
Beginning Balance $ 19.64    
Granted $ 26.08 [1] $ 23.57 $ 16.20
Vested $ 16.20    
Forfeited $ 27.84    
Ending Balance $ 23.28 $ 19.64  
[1] Includes 250,000 RSUs granted to certain executive officers that will be eligible to vest on March 31, 2015 assuming certain performance conditions are achieved over three annual performance periods. The Company recognizes compensation cost for its performance-based RSUs over the vesting period based on the probability that the performance condition will be satisfied.