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Restricted Stock Units Issued and Outstanding Under 2010 Incentive Plan (Detail) (2010 Incentive Award Plan, Restricted Stock Units, USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
2010 Incentive Award Plan | Restricted Stock Units
 
Restricted Stock Units  
Unvested Beginning Balance 741,000
Granted 396,000
Vested (303,000)
Forfeited (30,000)
Unvested Ending Balance 804,000
Expected to vest 790,000
Weighted Average Grant Date Fair Value  
Unvested Beginning Balance $ 10.94
Granted $ 10.76
Vested $ 10.81
Forfeited $ 10.89
Unvested Ending Balance $ 10.90
Expected to vest $ 10.90
Weighted Average Remaining Vesting Period (in years)  
Unvested at end of period 1 year 1 month 24 days
Expected to vest at end of period 1 year 1 month 24 days
Aggregate Intrinsic Value  
Unvested at end of period $ 6,976 [1]
Expected to vest at end of period $ 6,843 [1]
[1] The aggregate intrinsic value is calculated based on the fair value of $8.66 per share of the Company's common stock on December 31, 2012 due to the fact that the restricted stock units carry a $0 purchase price.