XML 35 R45.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summarized Information of Stock Options Outstanding (Detail) (USD $)
 6 Months Ended
Jun. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding 3,111,000
Options Outstanding, Average Remaining Contractual Life 6 years 131 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 12.39
Options Exercisable, Number Exercisable 1,469,000
Options Exercisable, Weighted Average Exercise Price $ 9.08
Range One
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit $ 2.41
Exercise Price Range, Upper Limit $ 3.68
Options Outstanding, Number Outstanding 414,000
Options Outstanding, Average Remaining Contractual Life 1 year 37 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 3.23
Options Exercisable, Number Exercisable 414,000
Options Exercisable, Weighted Average Exercise Price $ 3.23
Range Two
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit $ 6.07
Options Outstanding, Number Outstanding 278,000
Options Outstanding, Average Remaining Contractual Life 2 years 179 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 6.07
Options Exercisable, Number Exercisable 278,000
Options Exercisable, Weighted Average Exercise Price $ 6.07
Range Three
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit $ 10.39
Options Outstanding, Number Outstanding 428,000
Options Outstanding, Average Remaining Contractual Life 6 years 190 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 10.39
Options Exercisable, Number Exercisable 214,000
Options Exercisable, Weighted Average Exercise Price $ 10.39
Range Four
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit $ 13.93
Exercise Price Range, Upper Limit $ 14.31
Options Outstanding, Number Outstanding 928,000
Options Outstanding, Average Remaining Contractual Life 6 years 252 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 14.15
Options Exercisable, Number Exercisable 479,000
Options Exercisable, Weighted Average Exercise Price $ 14.08
Range Five
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit $ 16.11
Exercise Price Range, Upper Limit $ 17.50
Options Outstanding, Number Outstanding 1,063,000
Options Outstanding, Average Remaining Contractual Life 9 years 29 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 16.89
Options Exercisable, Number Exercisable 84,000
Options Exercisable, Weighted Average Exercise Price $ 16.11