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Employee Compensation Plans - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 14, 2013
Stock Appreciation Rights [Member]
Dec. 31, 2012
Stock Appreciation Rights [Member]
Dec. 31, 2011
Stock Appreciation Rights [Member]
Dec. 31, 2010
Stock Appreciation Rights [Member]
Jan. 24, 2013
Equity Incentive Plan [Member]
OptionPlan
Dec. 31, 2012
Equity Incentive Plan [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
Dec. 31, 2010
Equity Incentive Plan [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
Second anniversary [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
Third anniversary [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
Fourth anniversary [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
Six months before expiration [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
2008 Plan [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
2008 Plan [Member]
Second anniversary [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
2008 Plan [Member]
Three months before expiration [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
2008 Plan [Member]
First anniversary [Member]
Jan. 02, 2013
Employee Share Plan [Member]
Jan. 23, 2013
Employee Share Plan [Member]
Dec. 31, 2012
Employee Share Plan [Member]
Dec. 31, 2011
Employee Share Plan [Member]
Dec. 31, 2010
Employee Share Plan [Member]
Dec. 31, 2012
Employee Share Plan [Member]
Minimum [Member]
Dec. 31, 2012
Employee Share Plan [Member]
Maximum [Member]
Feb. 25, 2013
Employee Share Plan [Member]
Class A Stock [Member]
Feb. 25, 2013
Employee Share Plan [Member]
Class A Stock [Member]
Vesting Period Three Years [Member]
Feb. 25, 2013
Employee Share Plan [Member]
Class A Stock [Member]
Vesting Period Five Years [Member]
Dec. 31, 2012
Equity Incentive Plan and Employee Share Plan [Member]
Dec. 31, 2012
CIBC Deferred Compensation Plan [Member]
Dec. 31, 2012
Executive Deferred Compensation Plan and Deferred Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                
Term granted for options                   5 years           3 years                                
Vesting percent for options granted                       25.00% 25.00% 25.00% 25.00%   33.00% 33.00% 33.00%                          
Aggregate intrinsic value of options outstanding                 $ 134,600                                              
Aggregate intrinsic value of vested options                 78,300                                              
Aggregate intrinsic value of options that are expected to vest                 131,900                                              
Compensation expense relating to the share-based awards                 164,200 322,500 554,000                     3,400,000 3,700,000 7,100,000                
Unrecognized compensation cost related to unvested share-based compensation                 319,400                                              
Cost is expected to be recognized over a weighted average period         2 years 1 month 6 days       2 years 1 month 28 days                         2 years 3 months 18 days                    
Shares vesting period                                         3 years       3 years 5 years            
Percentage vested at the end of the ESP awards term                                           100.00%                    
Aggregate intrinsic value of ESP awards outstanding                                           14,700,000                    
The aggregate intrinsic value of ESP awards that are expected to vest                                           14,000,000                    
Unrecognized compensation cost related to unvested share-based compensation                                           7,800,000                    
Number of shares of Class A Stock available                                                           319,587    
Number of shares awarded                                       13,250                        
Vesting percentage of shares                                       25.00%                        
Next three years vesting percentage of shares                                       25.00%                        
Company awarded restricted shares                                         105,470                      
Shares vesting period                                         Jan. 22, 2016                      
Restricted shares, awards                                                     387,750 201,500 186,250      
Number of options awarded to purchase class A stock               951                                                
Vesting period of the options               4 years 6 months                                                
Aggregate intrinsic value of OARs outstanding and expected to vest         1,600,000                                                      
Compensation expense relating to the share-based awards         590,000 (2,900,000) (3,400,000)                                                  
Liability related to the OARs         2,600,000                                                      
Total unrecognized Compensation cost         2,700,000                                                      
Number of OARs       474,130                                                        
OARs vesting       5 years                                                        
Maximum annual contribution under Defined Contribution Plan 17,000 16,500 16,500                                                          
Employer contribution to Defined Contribution Plan 1,100,000 1,900,000 3,500,000                                                          
Deferred bonus amounts 8,100,000 6,800,000 7,000,000                                                          
Company-owned life insurance policy designed to offset a percentage of the EDCP liability 60.00%                                                              
Vesting period of deferred bonus 5 years                                                              
Company's deferred compensation liability                                                             14,000,000 41,600,000
Deferred compensation plans cost $ 12,100,000 $ 5,500,000 $ 11,000,000