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Stock-based Compensation Plans - Additional Information 3 (Detail) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of employees contribution |  |  |  |  |  |  |  |  | 75.00% |  |
Maximum percentage of employers contribution in cash |  |  |  |  |  |  |  |  | 6.00% |  |
Employer contribution |  |  |  |  |  |  |  |  | $ 6,100 | $ 5,800 |
Deferred compensation plan vesting period |  |  |  |  |  |  |  |  | 3 years |  |
Deferred compensation plan | $ (21,016) | $ (43,705) | $ (7,282) | $ (5,624) | $ (36,836) | $ (46,198) | $ 10,519 | $ (2,035) | $ (77,627) | $ (74,550) | $ 55,296
Shares held in rabbi trust total | 2.8 |  |  |  | 2.8 |  |  |  | 2.8 | 2.8 |
Vested shares held in rabbi trust | 2.5 |  |  |  | 2.5 |  |  |  | 2.5 | 2.5 |

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