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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
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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)

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- 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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Balance Type: | debit
Period Type: | instant

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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. + References No definition available. + Details
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- Details
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- Details
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