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Defined Contribution Plans and Deferred Compensation - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items] |  |  |
Amount of deferred compensation payable | $ 1.3 | $ 1.3 |
U.S. [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee contribution limit per calendar year (as a percent of compensation) | 80.00% |  |
Employer match of employee contributions of first level of eligible compensation (as a percent) | 100.00% |  |
Percentage of eligible compensation, matched by employer, level one | 2.00% |  |
Employer match of employee contributions of second level of eligible compensation (as a percent) | 50.00% |  |
Percentage of eligible compensation matched by employer, level two | 4.00% |  |
Expenses incurred for contribution plans | $ 2.7 | 2.3 | $ 2.0
Foreign Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Expenses incurred for contribution plans | $ 1.0 | $ 1.1 | $ 1.1
Italy [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Annual deferred compensation provision for leaving indemnity, as a percentage of total commissions earned | 3.80% |  |
Italy [Member] | Labor Force Concentration Risk [Member] | National Collective Labor Agreement [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of employees, percentage | 18.60% |  |

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- Definition Represents the annual provision for deferred compensation for the leaving indemnity, payable to agents in the event of dismissal and regulated by a national contract, equal to a percentage of the total commissions earned from the entity. + References No definition available. + Details
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- Definition The limit of annual employee contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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- Definition Represents the second level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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