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Schedule Of Restricted Stock Unit and Restricted Stock Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Feb. 29, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested at beginning of year   3,366 51 1,719
Granted, Stock 600 1,986 3,655 1,395
Modified, Stock       (449)
Converted to fixed cash equivalent       (1,496)
Vested, Stock   (552) (141) (1,069)
Surrendered, Stock   (569) (199) (49)
Non-vested at end of year, Stock   4,231 3,366 51
Weighted- Average Grant Price at beginning of year   $ 19.98 $ 22.85 $ 4.90
Granted, Weighted- Average Grant Price   $ 22.20 $ 19.89 $ 22.20
Modified, Weighted- Average Grant Price       $ 21.63
Converted to fixed cash equivalent, Weighted- Average Grant Price         
Vested, Weighted- Average Grant Price   $ 21.21 $ 18.13 $ 22.41
Surrendered, Weighted- Average Grant Price   $ 22.19 $ 19.90 $ 10.55
Non-vested at end of year, Weighted- Average Grant Price   $ 22.22 $ 19.98 $ 22.85
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested at beginning of year   985 671 811
Assumed in Merger, Stock       20
Granted, Stock 500 545 536 212
Modified, Stock       449
Converted to fixed cash equivalent       (164)
Vested, Stock   (643) (195) (651)
Surrendered, Stock   (115) (27) (6)
Non-vested at end of year, Stock   772 985 671
Weighted- Average Grant Price at beginning of year   $ 23.33 $ 17.20 $ 27.82
Assumed in Merger, Weighted- Average Grant Price       $ 23.66
Granted, Weighted- Average Grant Price   $ 24.01 $ 23.87 $ 24.55
Modified, Weighted- Average Grant Price       $ 21.63
Converted to fixed cash equivalent, Weighted- Average Grant Price         
Vested, Weighted- Average Grant Price   $ 23.05 $ 22.26 $ 31.47
Surrendered, Weighted- Average Grant Price   $ 24.01 $ 23.95 $ 11.03
Non-vested at end of year, Weighted- Average Grant Price   $ 23.94 $ 23.33 $ 17.20