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Employee Benefits - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) 50.00% | 80.00% |  |
Percentage of matching contribution made by company, of first 6.0% of participating employees contributions (as a percent) | 50.00% |  |
Percentage of participating employees contribution, matched 100% (as a percent) | 6.00% |  |
Employer contribution | $ 10,800 | $ 10,400 | $ 9,600
Non-qualified deferred income (expense) of investment | (4,900) | 12,100 | $ 5,300
Non-qualified deferred compensation plan assets | 84,435 | 85,589 |
Non-qualified deferred compensation plan liabilities | $ 84,435 | $ 85,589 |

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- Definition Defined contribution plan percentage of base compensation. + References No definition available. + Details
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- Definition Non-qualified deferred compensation plan gain loss on investments. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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