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Performance-Contingent Restricted Stock Activity (Detail) (Performance Contingent Restricted Stock, USD $)
4 Months Ended
Apr. 20, 2013
Performance Contingent Restricted Stock
 
Number of Shares  
Outstanding unvested at beginning of period 592,000
Number of Shares, Initial grant 552,000
Number of Shares, Grant reduction for not achieving the S&P TSR 63,000
Number of Shares, Vested (381,000)
Number of Shares, Forfeited (2,000)
Outstanding unvested at end of period 824,000
Weighted Average Grant Date Fair Value  
Weighted Average Fair Value, at beginning of period $ 18.92
Weighted Average Grant Date Fair Value, Initial grant $ 24.55
Weighted Average Grant Date Fair Value, Grant reduction for not achieving the S&P TSR $ 15.93
Weighted Average Grant Date Fair Value, Vested $ 15.93
Weighted Average Grant Date Fair Value, Forfeited $ 23.44
Weighted Average Fair Value, Balance at end of period $ 23.83