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Long-Term Compensation - RSU and PSU Awards (Detail) (RSU and PSA [Member], USD $)
12 Months Ended
Dec. 31, 2013
RSU and PSA [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares , beginning balance 1,999,348
Granted 1,288,457
Vested (939,464)
Forfeited (81,898)
Number of Shares , ending balance 2,266,443
Weighted Average Grant-Date Fair Value, Beginning balance $ 32.28
Weighted Average Grant-Date Fair Value, Granted $ 40.24
Weighted Average Grant-Date Fair Value, Vested $ 31.86
Weighted Average Grant-Date Fair Value, Forfeited $ 36.66
Weighted Average Grant-Date Fair Value, Ending balance $ 36.82
Number of Shares, Beginning Balance 47,680
Granted   
Vested   
Forfeited   
Number of Shares, Ending Balance 79,306