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Stock-Based Compensation Plans - Additional Information 3 (Detail) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |
Deferred compensation plan vesting period |  |  | 3 years |  |
Deferred compensation plan | $ (7,282) | $ 10,519 | $ (12,906) | $ 8,484 |
Shares held in rabbi trust total | 2.8 |  | 2.8 |  | 2.8
Vested shares held in rabbi trust | 2.4 |  | 2.4 |  | 2.5

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