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Share-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Non vested Restricted Awards
Year
Mar. 31, 2011
Non vested Restricted Awards
Mar. 29, 2012
Stock Options
Year
Mar. 31, 2012
Stock Options
Year
Mar. 31, 2011
Stock Options
Year
Mar. 29, 2012
Performance Share Plan 2012
Mar. 29, 2012
Performance Share Plan 2012
Maximum
Mar. 29, 2012
Performance Share Plan 2012
Minimum
Mar. 15, 2011
Performance Share Plan 2011
Mar. 15, 2011
Performance Share Plan 2011
Maximum
Mar. 15, 2011
Performance Share Plan 2011
Minimum
Apr. 30, 2010
Performance Options
Year
Apr. 30, 2010
Performance Options
Stock Price At Specified Percentage Above Grant Date Stock Price
Apr. 30, 2010
Performance Options
Attainment Of Earnings Per Share Goals
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Share-based compensation $ 3,598,000 $ 4,332,000                            
Share-based compensation related to expensing the fair value of stock options 1,100,000 1,900,000                            
Unrecognized compensation cost related to non vested share-based compensation arrangements     10,400,000     8,000,000                    
Unrecognized compensation cost related to non vested share-based compensation arrangements, recognition period     2.3     1.7                    
Authorized shares of non vested stock to key executives               241,095     263,292          
Performance shares grant expected vesting Period                 2014 2012   2013 2011      
Percentage of performance shares grant expected to vest               200.00%     200.00%          
Shares of Common stock issued to certain key employees and non-management members of Board of Directors     310,690 193,971                        
Value of Common stock issued to certain key employees and non-management members of Board of Directors     $ 6,700,000 $ 3,400,000                        
Number of options granted         730,574   699,426             1,400,000    
Share based compensation arrangement by share based payment award, vest and exercisable date                             Apr. 30, 2013 Dec. 31, 2012
Average fair value of option grant         $ 5.27   $ 5.77             $ 3.48    
Exercise price         $ 22.91   $ 17.57             $ 16.19    
Risk-free interest rate         1.75%   2.96%             2.07%    
Expected volatility         24.00%   30.00%             30.00%    
Expected term         7.9   8.5             4.0    
Dividend yield         1.75%   1.59%             1.79%    
Grant vesting period         3   3