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Customer Trust Fund - Gross Unrealized Losses and Related Fair Value of Investment (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	$ (13,800)	$ (8,900)
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	(50)	(100)
Other Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	$ (100)	$ (50)

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

+ Details

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X

- 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.

+ References

No definition available.

+ Details

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- Details

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- Details

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