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Performance-Contingent Restricted Stock Activity (Detail) (Performance Contingent Restricted Stock, USD $)
9 Months Ended
Oct. 06, 2012
Performance Contingent Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding unvested at beginning of period 576,000
Number of Shares, Vested (213)
Number of Shares, Granted 275,000
Number of Shares, Grant reduction for not achieving the S&P TSR (43,000)
Number of Shares, Forfeited (2,000)
Outstanding unvested at end of period 593,000
Weighted Average Fair Value, at beginning of period $ 16.67
Weighted Average Grant Date Fair Value, Vested $ 17.59
Weighted Average Grant Date Fair Value, granted $ 22.37
Weighted Average Grant Date Fair Value, Grant reduction for not achieving the S&P TSR $ 17.59
Weighted Average Grant Date Fair Value, Forfeited $ 16.50
Weighted Average Fair Value, Balance at end of period $ 18.92
Weighted average remaining contractual term , Nonvested at end of period 11 months 16 days
Aggregate intrinsic value, Nonvested at end of period $ 11,362