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Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payments award, number of shares granted | 8.9 |  |
Equity-based compensation plan expense | $ 6.4 | $ 6.8 | $ 5.7
Contractual term of stock options, Maximum | 10 years |  |
Period for which the options granted are generally vested | 3 years |  |
Portion of increments granted for stock options | One-third |  |
Term of increment grant | One year after the date of grant |  |
Expected volatility of the stock | The expected volatility of the stock was derived by using a 50/50 blend of implied and historical changes in the Company's historical stock prices over a time frame consistent with the expected life of the award. |  |
Total intrinsic value of options exercised | 2.2 |  |
Total cash received from employees stock option exercises | 1.7 | 2.0 |
Measurement dates of the VSEP | Dec. 31, 2012 |  |
Percentage of annual increments | 20.00% |  |
Percentage of compensation subject to statutory limits | 50.00% |  |
Percentage of participant's contribution | 50.00% |  |
Percentage of participant's elective deferral | 6.00% |  |
Percentage of participant's base salary plus annual cash bonus | 3.00% |  |
Percentage of vested contributions | 20.00% |  |
Contribution by the company | 1.0 | 1.1 | 1.1
Non-qualified elective deferred compensation plan | 100% of base salaries |  |
Matching contribution to participant | The difference between (a) 3% of the sum of the participant's base salary and annual performance-based bonus deferred under the 401(k) plan and the deferred compensation combined and (b) the actual employer matching contribution under the 401(k) plan. |  |
Deferred compensation expense | 20% per year |  |
Contribution to deferred compensation | 0.1 | 0.1 | 0.1
Deferred Compensation aggregated | 2.9 | 2.7 |
Number of common shares | 0.5 | 0.4 |
Value of common shares | 7.2 | 4.9 |
Vesting of restricted stock grants | 0.1 | 0.1 | 0.1
Deferred compensation obligations for vested restricted stock recorded in equity | 1.8 | 1.4 | 1.2
Reduction of deferred obligation | 1.1 | 2.3 | 5.5
Shares Outstanding Under Directors' Deferred Compensation Plan | 0.4 | 0.3 |
Shares outstanding value under Directors' Deferred Compensation Plan | 5.7 | 3.7 |
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period for which the options granted are generally vested | 4 years |  |
Total unrecognized stock option compensation cost granted | 6.8 |  |
Term of recognition of unrecognized stock option compensation cost | 2 years 3 months 18 days |  |
Restricted common shares | 0.3 | 0.2 | 0.6
Weighted-average fair value of the restricted stock | $ 13.92 |  |
Common shares issued | 0.1 | 0.1 | 0.1
Restricted Stock Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 9.25 |  |
Restricted Stock Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 15.36 |  |
VSEP awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period for which the options granted are generally vested | 7 years |  |
Total unrecognized stock option compensation cost granted | 3.2 |  |
Term of recognition of unrecognized stock option compensation cost | 4 years |  |
Weighted-average fair value of the restricted stock | $ 14.98 |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized stock option compensation cost granted | $ 1.7 |  |
Term of recognition of unrecognized stock option compensation cost | 1 year 9 months 18 days |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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