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Employee Compensation Plans - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Stock Appreciation Rights [Member]
Dec. 31, 2012
Stock Appreciation Rights [Member]
Dec. 31, 2011
Stock Appreciation Rights [Member]
Jan. 14, 2014
Stock Appreciation Rights [Member]
Subsequent Events [Member]
Dec. 31, 2013
Equity Incentive Plan [Member]
Dec. 31, 2012
Equity Incentive Plan [Member]
Dec. 31, 2011
Equity Incentive Plan [Member]
Dec. 31, 2013
Equity Incentive Plan [Member]
Second Anniversary [Member]
Dec. 31, 2013
Equity Incentive Plan [Member]
Third Anniversary [Member]
Dec. 31, 2013
Equity Incentive Plan [Member]
Fourth Anniversary [Member]
Dec. 31, 2013
Equity Incentive Plan [Member]
Six Months Before Expiration [Member]
Dec. 31, 2013
Employee Share Plan [Member]
Jan. 29, 2014
Employee Share Plan [Member]
Subsequent Events [Member]
Class A Stock [Member]
Dec. 31, 2013
Employee Share Plan [Member]
Restricted Stock [Member]
Class A Stock [Member]
Dec. 31, 2012
Employee Share Plan [Member]
Restricted Stock [Member]
Class A Stock [Member]
Dec. 31, 2011
Employee Share Plan [Member]
Restricted Stock [Member]
Class A Stock [Member]
Jan. 29, 2014
Employee Share Plan [Member]
Restricted Stock [Member]
Subsequent Events [Member]
Class A Stock [Member]
Jan. 29, 2014
Employee Share Plan [Member]
Vesting Period Three Years [Member]
Subsequent Events [Member]
Class A Stock [Member]
Jan. 29, 2014
Employee Share Plan [Member]
Vesting Period Five Years [Member]
Subsequent Events [Member]
Class A Stock [Member]
Dec. 31, 2013
Employee Share Plan [Member]
Minimum [Member]
Dec. 31, 2013
Employee Share Plan [Member]
Maximum [Member]
Dec. 31, 2013
Equity Incentive Plan and Employee Share Plan [Member]
Class A Stock [Member]
Jan. 29, 2014
1996 Equity Incentive Plan [Member]
Subsequent Events [Member]
Class A Stock [Member]
Option
Jan. 02, 2014
1996 Equity Incentive Plan [Member]
Subsequent Events [Member]
Class A Stock [Member]
Non Employee Director [Member]
Jan. 02, 2014
1996 Equity Incentive Plan [Member]
Restricted Stock Units [Member]
Subsequent Events [Member]
Class A Stock [Member]
Non Employee Director [Member]
Jan. 29, 2014
1996 Equity Incentive Plan [Member]
Employee Stock Option [Member]
Subsequent Events [Member]
Class A Stock [Member]
Feb. 26, 2014
Stock Incentive Plan Two Thousand Fourteen [Member]
Subsequent Events [Member]
Class A Stock [Member]
Dec. 31, 2013
CIBC Deferred Compensation Plan [Member]
Dec. 31, 2013
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                                                
Vesting percentage under share based payment                     25.00% 25.00% 25.00% 25.00%                           25.00%        
Aggregate intrinsic value of options outstanding               $ 202,700                                                
Aggregate intrinsic value of vested options               186,800                                                
Aggregate intrinsic value of options that are expected to vest               198,100                                                
Compensation expense relating to the share-based awards       4,100,000 590,000 2,900,000   158,200 164,200 322,500             5,000,000 3,400,000 3,700,000                          
Unrecognized compensation cost related to unvested share-based compensation               169,600                                                
Cost is expected to be recognized over a weighted average period       2 years 3 months 18 days       1 year 5 months 23 days                 2 years                              
Vesting period under share based payment       5 years     5 years                         5 years 3 years 5 years 3 years 5 years         4 years 6 months      
Percentage vested at the end of the ESP awards term                             100.00%                                  
Aggregate intrinsic value of ESP awards outstanding                                 30,900,000                              
The aggregate intrinsic value of ESP awards that are expected to vest                                 30,000,000                              
Unrecognized compensation cost related to unvested share-based compensation                                 10,100,000                              
Number of shares of Class A Stock available                                                 1,116,182              
Number of shares awarded                               179,375       124,000 136,250 43,125         14,000     27,500    
Shares vesting period                               Jan. 28, 2019                                
Next three years vesting percentage of shares                                                     25.00%          
Number of options awarded to purchase class A stock                                                   2,976            
Aggregate intrinsic value of OARs outstanding and expected to vest       10,300,000                                                        
Liability related to the OARs       6,700,000                                                        
Total unrecognized compensation cost       5,500,000                                                        
Number of OARs             543,370                                                  
Maximum annual contribution under Defined Contribution Plan 17,500 17,000 16,500                                                          
Employer contribution to Defined Contribution Plan 1,300,000 1,100,000 1,900,000                                                          
Deferred bonus amounts 8,500,000 8,100,000 6,800,000                                                          
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                                                             15,500,000 50,100,000
Deferred compensation plans cost $ 17,800,000 $ 12,100,000 $ 5,500,000