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Borrowings - Contractual Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 485,557  
2020 37,472  
2021 5,042  
2022 12,154  
2023 114  
Thereafter 10,045  
Total borrowings $ 550,384 $ 564,157