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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended 22 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Aug. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Person
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2012
2007 Omnibus Plan
Sep. 30, 2012
2007 Omnibus Plan
Apr. 11, 2012
2007 Omnibus Plan
Sep. 30, 2012
2005 Omnibus Plan
Sep. 30, 2013
Stock Option
Apr. 30, 2013
Performance Units
Jan. 31, 2013
Performance Units
Mar. 31, 2010
Performance Units
Mar. 31, 2013
Performance Units
Sep. 30, 2013
Performance Units
Dec. 31, 2011
Performance Units
Dec. 31, 2012
Performance Units
December 31, 2013
Sep. 30, 2013
Employee Stock Purchase Plan
Sep. 30, 2012
Employee Stock Purchase Plan
Sep. 30, 2013
Employee Stock Purchase Plan
Sep. 30, 2012
Employee Stock Purchase Plan
Sep. 01, 2009
Employee Stock Purchase Plan
Sep. 30, 2013
Restricted Share Units
Dec. 31, 2012
Restricted Share Units
Dec. 31, 2011
Restricted Share Units
Dec. 31, 2012
Restricted Share Units
December 31, 2013
Apr. 30, 2013
Restricted Share Units
Adjustment Special Cash Dividend
Jan. 31, 2013
Restricted Share Units
Adjustment Special Cash Dividend
Apr. 30, 2013
Restricted Share Units
Group One
Jan. 31, 2013
Restricted Share Units
Group One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Amended Omnibus Plan, increase in number of common shares authorized for issuance             6,314,496 2,544,327 5,593,200 495,915                                          
Number of common shares authorized for issuance                 15,000,000                                            
Dividend per share $ 2.24                                                            
Stock based compensation cost   $ 5,258 $ 5,579 $ 21,761 $ 22,745                                                    
Reduction in stock-based compensation costs   1,670   1,670                                                      
Unrecognized stock-based compensation cost for options   25,728   25,728                                                      
Weighted average remaining requisite vesting period                     4 years         1 year 1 month 6 days               1 year 10 months 24 days              
Minimum vesting schedules, months                               6 months               6 months              
Maximum vesting schedules, years                               3 years               4 years              
Shares issued on vested awards other than options                           503,969     243,781               4,000 102,000   1,819 100,800    
RSUs settled on vesting by issuing shares (net of minimum tax withholding)                                               188,966       240 13,557 533 13,719
Vested RSU against which shares to be issued                                                     44,286        
Unrecognized share-based compensation costs                               9,429               12,427              
Percentage of actual vesting                           90.90%     128.90% 122.20%                          
Shares issued net of tax withholdings                       4,679 156,511   334,922                                
Shares to be issued on vested awards other than options                                   231,029                          
Stock options vesting period, years                               3 years                              
Incremental compensation cost       5,500   4,109                                                  
Incremental compensation cost recognition period           21 months 15 days                                                  
Transfer of minimum percentage of voting power of company for change of control       25.00%                                                      
Number of employee affected       123                                                      
Weighted average period not yet recognized       1 year 10 months 6 days                                                      
Percentage of fair value per share allowed to eligible employees to purchase through payroll deductions                                             90.00%                
Maximum percentage of employee's base salary allowed to be purchased                                     15.00%   15.00%                    
Maximum dollar amount of common shares allowed to be purchased                                         25                    
Common shares reserved for issuance                                     4,200,000   4,200,000                    
Number of common shares issued under ESPP                                         81,040 63,106                  
Compensation expense for ESPP                                     $ 54 $ 34 $ 170 $ 111