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Share-Based Employee Compensation - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, shares granted     5 1,731  
Stock options granted during period, weighted average grant-date fair value     $ 2.63 $ 2.94  
Compensation expense related to stock options $ 621 $ 962 $ 1,056 $ 1,817  
Stock compensation expense 1,011 5,820 3,876 8,534  
Accrued employee compensation and benefits 23,522   23,522   23,785
Accrued employee compensation and benefits, noncurrent 6,519   6,519   6,970
Executive Compensation Contracts
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock compensation expense   2,852   3,551  
Total value of share-based awards granted       11,730  
Phantom Stock Units
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted 117 679 401    
Stock units, weighted average grant-date fair value $ 5.60 $ 7.51 $ 6.37    
Stock units outstanding, fair value 2,084 8,313 2,084 8,313  
Stock compensation expense 138 1,216 995 1,633  
Accrued employee compensation and benefits 1,162   1,162   1,325
Accrued employee compensation and benefits, noncurrent 923   923   594
Phantom Stock Units | Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     2 years    
Phantom Stock Units | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Restricted Stock Units (RSUs)
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted 83 58 383 61  
Stock units, weighted average grant-date fair value $ 6.01 $ 6.94 $ 6.38 $ 7.01  
Total unrecognized compensation expense related to non-vested shares granted 3,063   3,063    
Compensation expense related to restricted stocks 488 688 839 1,328  
Stock Appreciation Rights (SARs)
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted 289   3,400    
Stock units, weighted average grant-date fair value $ 1.78   $ 2.07    
Stock compensation expense (236)   985    
Accrued employee compensation and benefits 922   922   321
Accrued employee compensation and benefits, noncurrent $ 385   $ 385