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Benefit Plans - Activities for Unvested Stock Option Awards (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
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 Exercise Price, Beginning balance $ 25.35 $ 28.28 $ 29.02
Weighted-Average Grant-Date Fair Value, Granted $ 5.07 $ 5.63 $ 5.30
Weighted-Average Exercise Price, Ending balance $ 25.70 $ 25.35 $ 28.28
Unvested stock option awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options Outstanding, Beginning Balance 453    
Number of Options, Granted 345    
Number of options, Vested (184)    
Number of Options, Forfeited (53)    
Number of Options Outstanding, Ending Balance 561    
Weighted-Average Exercise Price, Beginning balance $ 5.34    
Weighted-Average Grant-Date Fair Value, Granted $ 5.06    
Weighted-Average Grant-Date Fair Value, Vested $ 5.21    
Weighted-Average Grant-Date Fair Value, Forfeited $ 5.19    
Weighted-Average Exercise Price, Ending balance $ 5.21