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General, Administrative and Other - Components of General, Administrative and Other Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other Income and Expenses [Abstract]    
Professional services $ 9,749 $ 14,960
Occupancy and equipment 7,605 7,584
Recurring placement and related service fees 6,492 3,342
Information processing and communications 5,024 5,362
Insurance 2,130 2,152
Business development 1,060 1,098
Foreign exchange (gains) and losses (29) 48
Other expenses 2,675 3,242
Total General, Administrative and Other $ 34,706 $ 37,788