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Summary of Activity for Stock Option Plans (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Number of Stock Options  
Stock options outstanding, beginning of year 9,006,944
Granted   
Exercised 0
Expired/forfeited (6,328,242)
Stock options outstanding, end of period 2,678,702
Options exercisable, end of period 2,678,702
Weighted Average Exercise Price  
Stock options outstanding, beginning of year $ 15.60
Granted   
Exercised $ 0
Expired/forfeited $ 15.14
Stock options outstanding, end of period $ 16.68
Options exercisable, end of period $ 16.68