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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 |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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