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Company's Stock Options and SAR Units Outstanding and Exercisable (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercisable, Number of Options/ SARs / RSUs 7,022
Exercisable, Weighted Average Exercise Price $ 11.83
Unexercisable, Number of Options/ SARs / RSUs 2,479
Unexercisable, Weighted Average Exercise Price $ 5.65
Total, Number of Options/ SARs / RSUs 9,501
Total, Weighted Average Exercise Price $ 10.21
Above $8.07
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercisable, Number of Options/ SARs / RSUs 3,503
Exercisable, Weighted Average Exercise Price $ 16.99
Unexercisable, Number of Options/ SARs / RSUs 56
Unexercisable, Weighted Average Exercise Price $ 8.25
Total, Number of Options/ SARs / RSUs 3,560
Total, Weighted Average Exercise Price $ 16.85
Less than $8.07
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercisable, Number of Options/ SARs / RSUs 3,519
Exercisable, Weighted Average Exercise Price $ 6.69
Unexercisable, Number of Options/ SARs / RSUs 2,423
Unexercisable, Weighted Average Exercise Price $ 5.58
Total, Number of Options/ SARs / RSUs 5,942
Total, Weighted Average Exercise Price $ 6.24