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Employee Benefit Plans - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of amount vested to defined contribution retirement savings plan | 100.00% |  |
Expense for continuing and discontinued operations under employee benefit plan | $ 11,900,000 | $ 12,800,000 | $ 11,500,000
Percentage of fair market value of common stock | 95.00% |  |
Percentage of shares limited to an employee under employee stock purchase plan | 10.00% |  |
Maximum salary of employee allowed to purchase shares under employee stock purchase plan | $ 25,000 |  |
Common stock issued under employee stock purchase plan | 2.6 |  |
Employee Stock Purchase Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Authorized to grant the common stock under the employee stock purchase plan | 4.0 |  |
0-2% Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of amount contributed to defined contribution retirement savings plan | 100.00% |  |
2-4% Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of amount contributed to defined contribution retirement savings plan | 50.00% |  |

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- Definition Employer Match Contributed To Defined Contribution Retirement Savings Plan Percentage. + References No definition available. + Details
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- Definition Employer Vested To Defined Contribution Retirement Savings Plan Percentage + References No definition available. + Details
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- Definition Maximum salary of employee allowed to purchase shares under purchase plan. + References No definition available. + Details
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- Definition The cumulative number of shares of common stock issued under the employee stock purchase plan. + References No definition available. + Details
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- Definition The per share price as a percent of the fair market value of one share of common stock under the share based compensation arrangement for the employee stock purchase plan. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -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 The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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