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Stock Options and Restricted Stock Units Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options Outstanding, Beginning of period 1,322,367 1,300,400 1,481,550
Number of Options, Granted 0 161,250 82,000
Number of Options, Exercised 0 (18,125) (194,650)
Number of Options, Forfeited (238,937) (27,833) (28,500)
Number of Options, Expired (98,750) (93,325) (40,000)
Number of Options Outstanding, Ending of period 984,680 1,322,367 1,300,400
Number of Options, Exercisable 956,784 1,044,125 970,450
Weighted-Average Exercise Price Outstanding, Beginning of period $ 27.81 $ 29.06 $ 27.85
Weighted-Average Exercise Price, Granted $ 0.00 $ 17.14 $ 28.70
Weighted-Average Exercise Price, Exercised $ 0.00 $ 3.93 $ 18.83
Weighted-Average Exercise Price, Forfeited $ 27.66 $ 28.80 $ 38.60
Weighted-Average Exercise Price, Expired $ 32.58 $ 26.85 $ 26.25
Weighted-Average Exercise Price Outstanding, End of period $ 27.36 $ 27.81 $ 29.06
Weighted-Average Exercise Price, Exercisable $ 27.77 $ 29.27 $ 30.78
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Restricted Stock Nonvested, Beginning of period 162,957 79,150 79,074
Number of Restricted Stock, Granted 448,152 125,678 49,752
Number of Restricted Stock, Exercised (1,458) (31,267) (22,100)
Number of Restricted Stock, Forfeited (85,275) (10,604) (27,576)
Number of Restricted Stock Nonvested, Ending period 524,376 162,957 79,150
Weighted-Average Grant Date Fair Value Nonvested, Beginning of period $ 15.15 $ 35.82 $ 44.63
Weighted-Average Grant Date Fair Value, Granted $ 4.45 $ 9.82 $ 27.34
Weighted-Average Grant Date Fair Value, Vested $ 46.96 $ 43.20 $ 34.66
Weighted-Average Grant Date Fair Value, Forfeited $ 10.87 $ 16.61 $ 46.81
Weighted-Average Grant Date Fair Value Nonvested, Ending period $ 6.96 $ 15.15 $ 35.82
Restricted Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Restricted Stock Nonvested, Beginning of period 85,118 46,001 0
Number of Restricted Stock, Granted 405,915 47,618 46,001
Number of Restricted Stock, Exercised (35,815) (1,000) 0
Number of Restricted Stock, Forfeited (139,087) (7,501) 0
Number of Restricted Stock Nonvested, Ending period 316,131 85,118 46,001
Weighted-Average Grant Date Fair Value Nonvested, Beginning of period $ 24.85 $ 29.84 $ 0.00
Weighted-Average Grant Date Fair Value, Granted $ 4.36 $ 21.01 $ 29.84
Weighted-Average Grant Date Fair Value, Vested     $ 0
Weighted-Average Grant Date Fair Value, Exercised $ 25.51 $ 35.01  
Weighted-Average Grant Date Fair Value, Forfeited $ 9.75 $ 29.73 $ 0.00
Weighted-Average Grant Date Fair Value Nonvested, Ending period $ 5.11 $ 24.85 $ 29.84