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Shareholders' Equity - Share-Based Compensation Arrangement by Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
$25.90 - $27.21 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of shares 1,900
Option price range, Lower $ 25.90
Option price range, Upper $ 27.21
Weighted average exercise price $ 27.21
Weighted average remaining contractual life 4 days
$19.18 - $22.83 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of shares 8,188,365
Option price range, Lower $ 19.18
Option price range, Upper $ 22.83
Weighted average exercise price $ 22.71
Weighted average remaining contractual life 3 months 26 days
$16.73 - $17.08 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of shares 99,986
Option price range, Lower $ 16.73
Option price range, Upper $ 17.08
Weighted average exercise price $ 17.03
Weighted average remaining contractual life 8 months 19 days