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Customer Trust Fund - Gross Unrealized Losses and Related Fair Value of Investment (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses $ (17,700)
Less than 12 months, Fair Value 895,300
12 months or more, Unrealized Losses (10,700)
12 months or more, Fair Value 434,600
Total, Unrealized Losses (28,400)
Total, Fair Value 1,329,900
U.S. Government and Agencies Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (11,400)
Less than 12 months, Fair Value 442,800
12 months or more, Unrealized Losses (5,100)
12 months or more, Fair Value 111,600
Total, Unrealized Losses (16,500)
Total, Fair Value 554,400
Canadian and Provincial Government Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (400)
Less than 12 months, Fair Value 35,900
12 months or more, Unrealized Losses (1,600)
12 months or more, Fair Value 99,400
Total, Unrealized Losses (2,000)
Total, Fair Value 135,300
Corporate Debt Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (3,700)
Less than 12 months, Fair Value 259,700
12 months or more, Unrealized Losses (2,300)
12 months or more, Fair Value 120,800
Total, Unrealized Losses (6,000)
Total, Fair Value 380,500
Asset-backed Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (2,100)
Less than 12 months, Fair Value 150,200
12 months or more, Unrealized Losses (1,300)
12 months or more, Fair Value 82,300
Total, Unrealized Losses (3,400)
Total, Fair Value 232,500
Mortgage-backed Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (100)
Less than 12 months, Fair Value 2,600
12 months or more, Unrealized Losses (300)
12 months or more, Fair Value 8,100
Total, Unrealized Losses (400)
Total, Fair Value 10,700
Other Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (50)
Less than 12 months, Fair Value 4,100
12 months or more, Unrealized Losses (100)
12 months or more, Fair Value 12,400
Total, Unrealized Losses (100)
Total, Fair Value $ 16,500