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Equity-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued (in shares)   724,040      
Cash paid for minimum tax withholdings   $ 13,000   $ 12,965 $ 1,498
Share based compensation expense 2,250   1,680 5,977 4,482
Performance Share Units
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Settlement and distribution of shares issued (in shares)   499,680      
Number of shares settled as percentage of outstanding amount   200.00%      
Restricted stock units
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Settlement and distribution of shares issued (in shares)   90,856      
Shares vested (in shares)   257,112      
Shares deferred for future issuance (in shares)   166,256      
Performance shares
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense 1,953   1,359 5,284 3,594
Performance shares | Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of amount subject to performance share award of number of shares actually issued 0.00%     0.00%  
Performance shares | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of amount subject to performance share award of number of shares actually issued 200.00%     200.00%  
Director
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense $ 1,800   $ 500 $ 1,700 $ 600