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Customer Trust Fund - Gross Unrealized Losses and Related Fair Value of Investment (Parenthetical) (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Unrealized losses, less than 12 months $ 100
Mortgage-backed Securities [Member] | Maximum [Member]  
Debt Securities, Available-for-sale [Line Items]  
Unrealized losses, less than 12 months $ 50