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Stock-Based Compensation Plans - Additional Information 3 (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |
Non-cash, Mark-to-market (income) loss related to deferred compensation plan | $ (46,198) | $ (2,225) | $ (37,714) | $ 33,257 |
Shares held in rabbi trust total | 2.8 |  | 2.8 |  | 2.8
Vested shares held in rabbi trust | 2.4 |  | 2.4 |  | 2.4

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- Details
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