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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of employees contribution |  |  |  |  |  |  |  |  | 75.00% |  |
Maximum percentage of employers contribution in cash |  |  |  |  |  |  |  |  | 6.00% |  |
Employer contribution |  |  |  |  |  |  |  |  | $ 5,800 | $ 5,100 | $ 4,700
Deferred compensation plan vesting period |  |  |  |  |  |  |  |  | 3 years |  |
Deferred compensation plan | $ 18,072 | $ (223) | $ (6,615) | $ 7,397 | $ 14,077 | $ 9,203 | $ 14,466 | $ 13,169 | $ 18,631 | $ 50,915 | $ (19,153)
Shares held in rabbi trust total | 2.6 |  |  |  | 2.9 |  |  |  | 2.6 | 2.9 |
Vested shares held in rabbi trust | 2.4 |  |  |  | 2.8 |  |  |  | 2.4 | 2.8 |

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