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Long-Term Compensation - RSU and PSU Awards (Detail) (RSU and PSA [Member], USD $)
12 Months Ended
Dec. 31, 2012
RSU and PSA [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning Balance 1,684,713
Granted 1,609,527
Vested (1,238,036)
Forfeited (56,856)
Number of Shares, Ending Balance 1,999,348
Weighted Average Grant-Date Fair Value, Beginning balance $ 30.43
Weighted Average Grant-Date Fair Value, Granted $ 32.60
Weighted Average Grant-Date Fair Value, Vested $ 30.26
Weighted Average Grant-Date Fair Value, Forfeited $ 31.60
Weighted Average Grant-Date Fair Value, Ending balance $ 32.28
Vested, beginning balance 48,735
Vested, ending balance 47,680