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Summary of Restricted Stock Activity Under the Incentive Plan for Members of Management (Detail) (Restricted Stock Units (RSUs), Management, USD $)
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Restricted Stock Units (RSUs) | Management
     
Restricted Stock     
Beginning Balance  1,131,736138,512138,512
Granted001,559,4631,525,4161,525,416
Vested  (51,211) (340,879)
Forfeited  (173,326) (191,313)
Ending Balance2,466,662 2,466,662 1,131,736
Weighted-Average Grant Date Fair Value     
Non-vested at beginning of period  $ 3.61$ 23.62$ 23.62
Granted  $ 3.24 $ 2.70
Vested  $ 8.92 $ 7.87
Forfeited$ 4.40 $ 4.40 $ 3.24
Non-vested at end of period$ 3.21 $ 3.21 $ 3.61