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Leases - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
City
Operating Leased Assets [Line Items]  
Right-of-use asset $ 185
Operating lease costs $ 13,000
Weighted-average remaining lease term 2 years 6 months
Weighted-average discount rate 6.75%
M&I Brazil  
Operating Leased Assets [Line Items]  
Number of cities in which offices and facilities were leased | City 3
Lease expiration year month 2022-01