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Retirement and Deferred Compensation Plans - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Retirement Plan |  |  |
Defined Contribution Benefit Plans [Line Items] |  |  |
Defined contribution plan description | The 2012 annual 401(k) deferral limit for employees under age 50 was $17,000. Employees turning age 50 or over in 2012 could defer up to $22,500 in 2012. The Company makes matching contributions to the plan equal to 100% on the first 15% of employee deferred wages. |  |
Percentage matching contributions from employer on the first 15% of employee deferred wages | 100.00% |  |
Retirement plan expense | $ 11,400,000 | $ 7,400,000 | $ 8,700,000
Retirement Plan | Employees under age 50 | Maximum |  |  |
Defined Contribution Benefit Plans [Line Items] |  |  |
Maximum annual employee deferral | 17,000 |  |
Retirement Plan | Employees turning age 50 or more | Maximum |  |  |
Defined Contribution Benefit Plans [Line Items] |  |  |
Maximum annual employee deferral | 22,500 |  |
Deferred Compensation Plan |  |  |
Defined Contribution Benefit Plans [Line Items] |  |  |
Employer contributions to deferred compensation plan | $ 3,500,000 | $ 3,100,000 | $ 2,800,000
Deferred Compensation Plan | Maximum |  |  |
Defined Contribution Benefit Plans [Line Items] |  |  |
Percentage of employee gross earnings employer makes matching contributions on for the non-qualified deferred compensation plan | 15.00% |  |

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- Definition Amount of Wage Employee Could Defer + References No definition available. + Details
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- Definition Deferred Compensation Plan, Employer Contribution, Percentage of Employee Gross Earnings Matching Contributions Are Made On. + References No definition available. + Details
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- Definition Description of 401 K Plan. + References No definition available. + Details
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- Definition Employer 401(k) matching contribution on first 15% of employee's deferred wages. + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 -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 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -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 FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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