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Share-Based Compensation - Additional Information (Detail) (USD $)
 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Restricted Stock [Member]
Chief Executive Officer [Member]
Sep. 30, 2013
Time-Based Restricted Stock [Member]
Sep. 30, 2012
Time-Based Restricted Stock [Member]
Sep. 30, 2013
Time-Based Restricted Stock [Member]
Sep. 30, 2012
Time-Based Restricted Stock [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2012
Stock Options [Member]
Maximum [Member]
Sep. 30, 2013
Stock Options [Member]
Maximum [Member]
Sep. 30, 2012
Stock Options [Member]
Maximum [Member]
Sep. 30, 2013
Stock Options [Member]
Minimum [Member]
Sep. 30, 2013
Long Term Incentive Plan [Member]
Sep. 30, 2013
Long Term Incentive Stock Option [Member]
Sep. 30, 2013
Long Term Incentive Stock Option [Member]
Maximum [Member]
Sep. 30, 2013
Long Term Incentive Stock Option [Member]
Minimum [Member]
Sep. 30, 2013
Performance-Based Restricted Stock [Member]
Sep. 30, 2012
Performance-Based Restricted Stock [Member]
Sep. 30, 2013
Performance-Based Restricted Stock [Member]
Sep. 30, 2012
Performance-Based Restricted Stock [Member]
Sep. 30, 2013
Deferred Compensation Plan [Member]
Deferrals
Sep. 30, 2012
Long Term Incentive Plan Stock Option [Member]
Sep. 30, 2013
Long Term Incentive Plan Stock Option [Member]
Sep. 30, 2012
Long Term Incentive Plan Stock Option [Member]
Sep. 30, 2013
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Sep. 30, 2012
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                          
Common shares reserved for awards     800,000           300,000 300,000           900,000 100,000                        
Option issued under vest plan                   50.00%                               50.00%      
Option issued under vest plan and granted after 2 years                   75.00%                               75.00%      
Option issued under vest plan and granted after 3 years                   100.00%                               100.00%      
Option issued under vest plan and expire                         10 years   5 years     10 years 5 years                    
Estimated Forfeitures                   $ 0                               $ 0      
Stock options exercised 12,400                 12,400 9,111                             12,750 1,250    
Total intrinsic value of stock options                   300,000 400,000                             300,000     100,000
Cash received for exercise of stock options awards                   500,000 200,000                             600,000     100,000
Excess tax benefits                   100,000 100,000                             100,000     100,000
Compensation expenses         100,000 100,000 200,000 200,000 0 0   100,000   100,000                     100,000 100,000 200,000 100,000  
LTIP expiry date                               Apr. 17, 2018                          
Share based compensation arrangement share based payment award vesting period       3 years                                                  
Weighted-average period             1 year 10 months 24 days                             1 year 10 months 24 days       1 year 3 months 18 days      
Compensation cost expected to be recognized over period         500,000   500,000                         4,000,000   4,000,000              
Performance-based compensation expense                                       700,000 600,000 2,000,000 1,800,000            
Excess tax benefits from restricted share awards                                           0 0            
Shares remaining to be issued     429,837                           57,000                        
Number of deferrals                                               2          
Deferred shares and held by the rabbi trust 184,787 184,036                                                      
Granted, Number of Shares 0                                                 0 8,000    
Expected compensation cost related to unvested awards not yet recognized                                                   $ 200,000