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Defined Contribution Plans and Deferred Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |
Expenses incurred for contribution plans | $ 1,100,000 | $ 1,100,000 | $ 1,000,000.0
Deferred compensation payments | 100,000 | 200,000 | 100,000
Amount of deferred compensation payable | $ 1,300,000 | 1,400,000 |
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 | $ 2,300,000 | $ 2,000,000.0 | $ 1,900,000
Italy [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Annual deferred compensation provision for leaving indemnity, as a percentage of total commissions earned | 3.50% |  |
Italy [Member] | Labor Force Concentration Risk [Member] | National Collective Labor Agreement [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of employees, percentage | 19.60% |  |

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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 For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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