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Financial Instruments (Bonds) - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Corporate and municipal bonds	$ 58,900	$ 55,700
Maturity dates of bonds, start date	2020-01
Maturity dates of bonds, end date	2024-02
Funds held for clients	$ 179,502	161,289
Certified Deposits and Other Depository Assets [Member]
Schedule Of Available For Sale Securities [Line Items]
Funds held for clients	$ 2,500	$ 2,300

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- Definition

Corporate and municipal bonds net par value.

+ References

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- Definition

Maturity date of bond end date.

+ References

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- Definition

Maturity date of bond start date.

+ References

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- Definition

Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance 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 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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