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Stock-Based Compensation Plans - Additional Information 3 (Detail) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Deferred compensation plan vesting period | 3 years |  |
Deferred compensation plan | $ 16,056 | $ (5,624) |
Shares held in rabbi trust total | 2.8 |  | 2.8
Vested shares held in rabbi trust | 2.4 |  | 2.5

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