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Customer Trust Fund - Gross Unrealized Losses and Related Fair Value of Investment (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | $ (13,800) | $ (8,900)
Less than 12 months, Fair Value | 718,500 | 1,080,400
12 months or more, Unrealized Losses | (18,900) | (4,400)
12 months or more, Fair Value | 663,700 | 194,900
Total, Unrealized Losses | (32,700) | (13,300)
Total, Fair Value | 1,382,200 | 1,275,300
U.S. Government and Agencies Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | (8,000) | (3,600)
Less than 12 months, Fair Value | 257,900 | 436,700
12 months or more, Unrealized Losses | (11,100) | (3,500)
12 months or more, Fair Value | 268,700 | 113,500
Total, Unrealized Losses | (19,100) | (7,100)
Total, Fair Value | 526,600 | 550,200
Canadian and Provincial Government Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | (900) | (1,500)
Less than 12 months, Fair Value | 86,900 | 133,400
12 months or more, Unrealized Losses | (1,800) |
12 months or more, Fair Value | 100,800 |
Total, Unrealized Losses | (2,700) | (1,500)
Total, Fair Value | 187,700 | 133,400
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | (3,700) | (2,000)
Less than 12 months, Fair Value | 271,100 | 264,200
12 months or more, Unrealized Losses | (3,100) | (500)
12 months or more, Fair Value | 145,900 | 41,400
Total, Unrealized Losses | (6,800) | (2,500)
Total, Fair Value | 417,000 | 305,600
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | (1,100) | (1,700)
Less than 12 months, Fair Value | 97,400 | 239,600
12 months or more, Unrealized Losses | (2,500) | (100)
12 months or more, Fair Value | 129,800 | 17,000
Total, Unrealized Losses | (3,600) | (1,800)
Total, Fair Value | 227,200 | 256,600
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | (50) | (100)
Less than 12 months, Fair Value | 1,200 | 4,100
12 months or more, Unrealized Losses | (300) | (200)
12 months or more, Fair Value | 8,000 | 10,400
Total, Unrealized Losses | (300) | (300)
Total, Fair Value | 9,200 | 14,500
Other Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Unrealized Losses | (100) | (50)
Less than 12 months, Fair Value | 4,000 | 2,400
12 months or more, Unrealized Losses | (100) | (100)
12 months or more, Fair Value | 10,500 | 12,600
Total, Unrealized Losses | (200) | (100)
Total, Fair Value | $ 14,500 | $ 15,000

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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 12 months or longer. + 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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