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Stock-Based Compensation - Activity and Pricing Information for Nonvested Shares in Deferred Compensation Plans (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-Average Grant Date Fair Value, Granted $ 7.97    
Deferred Compensation Plans [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at December 31, 2011, Number of Nonvested Shares 1,338,325    
Number of Nonvested Shares, Granted 815,663    
Number of Nonvested Shares, Dividend Equivalents 77,930    
Number of Nonvested Shares, Vested (930,731)    
Number of Nonvested Shares, Forfeited (105,338)    
Outstanding at December 31, 2012, Number of Nonvested Shares 1,195,849 1,338,325  
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value $ 7.64    
Weighted-Average Grant Date Fair Value, Granted $ 6.63 $ 8.03 $ 7.93
Weighted-Average Grant Date Fair Value, Dividend Equivalents $ 8.23    
Weighted-Average Grant-Date Fair Value, Vested $ 7.75    
Weighted-Average Grant-Date Fair Value, Forfeited $ 6.62    
Outstanding at December 31, 2012, Weighted-Average Grant-Date Fair Value $ 7.00 $ 7.64