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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-cash, Mark-to-market income (loss) related to deferred compensation plan | $ 10,519 | $ (6,878) | $ 8,484 | $ 35,482 |
Shares held in rabbi trust total | 2.9 |  | 2.9 |  | 2.8
Vested shares held in rabbi trust | 2.4 |  | 2.4 |  | 2.4

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