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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