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Share-Based Compensation Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Disclosure Share Based Compensation Expenses [Abstract]        
Option plan $ 5,853 $ 4,256 $ 10,977 $ 8,357
Other share-based awards 7,973 8,370 18,105 27,296
Total share-based compensation before tax 13,826 12,626 29,082 35,653
Tax benefit 5,168 4,746 10,866 13,353
Total share-based compensation expense included in net income $ 8,658 $ 7,880 $ 18,216 $ 22,300