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Stock-Based Compensation Plans - Additional Information 4 (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Maximum percentage of employers contribution | 75.00% |  |
Maximum percentage of employers contribution in cash | 6.00% |  |
Employer contribution | $ 5.1 | $ 4.0 |
Non-cash, Mark-to-market income (loss) related to deferred compensation plan | $ (55.3) | $ (7.2) | $ (43.2)
Shares held in rabbi trust total | 2.8 | 2.7 |
Vested shares held in rabbi trust | 2.4 | 2.3 |

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- Definition Non cash mark to market income (loss) related to deferred compensation plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The total number of shares granted that reside within the deferred compensation plan. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The total number of shares that are vested that reside within the deferred compensation plan. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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