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

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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